Schiff base

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1 - Complexation of Bis(acetylacetonate)oxovanadium(IV) with D–penicillamine at neutral medium
R. Hakimelahi M.A. Seyed Sadjadi H. Aghaie M. Aghaie

Neutral bidentate N-O type complexe of VO(II) has been synthesized through condensation of Dpenicillamine,(D-H2Pen), with Bis(acetylacetonate)- oxovanadium(IV),[VO(acac)2], at neutralmedium . The established schiff base(NO type) complex was characterized on the basis of أکثر

Neutral bidentate N-O type complexe of VO(II) has been synthesized through condensation of Dpenicillamine,(D-H2Pen), with Bis(acetylacetonate)- oxovanadium(IV),[VO(acac)2], at neutralmedium . The established schiff base(NO type) complex was characterized on the basis of IR andmass spectroscopy techniques.Besides,D-H2Pen binding behavior to[VO(acac)2] has been studiedin thermodynamic viewpoint using Uv/Vis spectroscopy.The measurments were done in 5mMphosphate buffer,pH 7.0 and various temperatures.The optical absorption spectra of[VO(acac)2]were analyzed in order to obtain binding constants and stoichiometries using SQUADsoftware.The results show that the best fitting corresponds to 1:2 metal to ligand, complexbetween [VO(acac)2] and D-H2Pen.The estimation of binding constant at various temperaturesenabled us to calculate all of the thermodynamic parameters of binding using Van,t Hoff equation. تفاصيل المقالة

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2 - Synthesis and Solution Complexation Studies of a new Schiff base Ligand
Mahmood Payehghadr Farzaneh Nourifard Mehdi Kalhor Chiman Shahoei

A new Schiff base ligand, 2,2'-{pyridine-2,6-diylbis[nitrilo(E)methylylidene]}bis(4 bromophenol),has been synthesized by reaction of the 2,6-diamino pyridine with 5-bromo salicylaldehyde at ethanolunder refluxing. The structure of the synthesized compound resulted from أکثر

A new Schiff base ligand, 2,2'-{pyridine-2,6-diylbis[nitrilo(E)methylylidene]}bis(4 bromophenol),has been synthesized by reaction of the 2,6-diamino pyridine with 5-bromo salicylaldehyde at ethanolunder refluxing. The structure of the synthesized compound resulted from the IR, 1HNMR, MS andUV spectroscopy and elemental analysis data. Formation Constant (kf) value of it’s complexes withCu2+, Ni2+, Cd2+, Co2+ and Hg2+ has been determined Conductometrically. The formation constants ofthe resulting 1:1 complexes have been calculated from the computer fitting of the molar conductance- mole ratio data at different temperatures. The stability of the complexes to vary in acetonitrilesolvent was in the order of Cu2+ > Cd2+ > Co2+ > Hg2+ > Ni2+. The enthalpy and entropy changes ofthe complexation reactions have been evaluated from the temperature dependence of formationconstants. تفاصيل المقالة

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3 - Synthesis and Characterization of Novel Lead (II) Complexes with Schiff Base Iminopyridine Ligand
Nasrin Fallah Mohamad Reza Talei Bavil Olyai

First, Schiff base iminopyridine ligand has been prepared by the condensation between primary amine, dimethylaniline and active carbonyl group of pyridine carboxaldehyde, then related complexes were synthesized in methanol solution. The ligand and metal complexes have b أکثر

First, Schiff base iminopyridine ligand has been prepared by the condensation between primary amine, dimethylaniline and active carbonyl group of pyridine carboxaldehyde, then related complexes were synthesized in methanol solution. The ligand and metal complexes have been characterized by elemental analysis, UV, IR, 1 H NMR and 13CNMR spectroscopy. The spectroscopic data of metal complexes indicated that the metal ions are complex with azomethine group and pyridine nitrogen atoms. The ligand acts as bidentate with two N sites and can coordinate with metal ion تفاصيل المقالة

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4 - Synthesis, Spectral, Biological and Theoretical Investigation of Some New Sn (IV) Complexes with Schiff Base Ligands Containing NNOS Coordination Sphere
Sheida Esmaielzadeh

New tin (IV) complexes of empirical formula, [Cl2 Me2 Sn(H2 L)1-3], where ((H2 L)1-3: Methyl-2- {[1-methyl-2-(2-hydroxy-3-methoxyphenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate [H2cd3OMesalMeen], Methyl-2-{[1-methyl-2-(2-hydroxy-4-methoxyphenyl)met أکثر

New tin (IV) complexes of empirical formula, [Cl2 Me2 Sn(H2 L)1-3], where ((H2 L)1-3: Methyl-2- {[1-methyl-2-(2-hydroxy-3-methoxyphenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate [H2cd3OMesalMeen], Methyl-2-{[1-methyl-2-(2-hydroxy-4-methoxyphenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocar-boxylate, [H2 cd4OMesalMeen], Methyl-2-{[1-methyl-2-(2-hydroxy-5-methoxyphenyl)-methylidynenitrilo]ethyl}amino-1- cyclopentenedithiocarboxylate, H2 cd5OMesalMeen]) have been prepared and fully characterized by a variety of physico-chemical techniques. Spectroscopic data suggest that in three complexes the Schiff base ligand is coordinated through oxygen. The Schiff base ligands and their Sn (IV) complexes were tested against two pathogenic bacteria (Staphylococcus aureus as Gram-positive bacteria and Escherichia coli as Gram-negative bacteria). All the complexes exhibit higher antibacterial activity than the free ligands. Computation analyses at the level of DFT with Becke’s three parameter hybrid methods were performed to study the geometrics, electronic structures; HOMO- LUMO energy gap, dipole moment and its calculated vibrational frequencies were investigated. An excellent agreement between the experimental and calculated results obtained from the two spectra methods. تفاصيل المقالة

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5 - Synthesis and Characterization of New Mercury (II) Complexes with Bidentate Chelating Schiff Base Iminopyridine Ligand
Mohamad Reza Talei Bavil Olyai

First, Schiff base iminopyridine ligands has been prepared by the condensation between primaryamines, different substituted anilines and active carbonyl group of pyridine carboxaldehyde, thenthe complexes [diiodo (3-ethylphenyl) pyridine-2-yl methylene amine] mercury(II أکثر

First, Schiff base iminopyridine ligands has been prepared by the condensation between primaryamines, different substituted anilines and active carbonyl group of pyridine carboxaldehyde, thenthe complexes [diiodo (3-ethylphenyl) pyridine-2-yl methylene amine] mercury(II), complex a,[dibromo (2,5-dimethylphenyl) pyridine-2-yl methylene amine] mercury(II) complex b, and[dinitrato bis-(2,6-dimethylphenyl) pyridine-2-yl methylene amine] mercury(II) nitrate, complexc, synthesized in methanol solution. The ligands and metal complexes have been characterizedby elemental analysis, UV, IR, 1H-NMR and 13C-NMR spectroscopy. The spectroscopic data ofmetal complexes indicated that the metal ions are complexed with azomethine group andpyridine nitrogen atoms. The Schiff base ligand acts as bidentate with two N sites and cancoordinate with mercury ion. تفاصيل المقالة

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6 - Synthesis, Crystal Structure and Antibacterial Evaluation of Di-μ-chlorido-bis({2-[(4-methoxyphenyl)- iminomethyl]pyridine-κ2N,N']Mercury(II)
Behzad Jamali Aghbash Mahboubeh Manoochehri Maryam Daghighi Asli

New coordination polymer of [HgLCl2]n (1) with HgCl2 and Schiff base bidentate ligand (4-methoxyphenyl) pyridine-2yl methyleneamine (L) was prepared and structurally characterized. In the 1D network structure of 1, the mecury (II) ion adopts an HgN2Cl3 distorted square أکثر

New coordination polymer of [HgLCl2]n (1) with HgCl2 and Schiff base bidentate ligand (4-methoxyphenyl) pyridine-2yl methyleneamine (L) was prepared and structurally characterized. In the 1D network structure of 1, the mecury (II) ion adopts an HgN2Cl3 distorted square pyramid geometry. In this complex, one of the chlorine acts as bridging ligand connecting two adjacent mercury(II) ions while, the L ligand is coordinated to mercury(II)ion in a cyclic-bidentate fashion forming an five-membered metallocyclic ring. Coordination compounds1 has been characterized by infrared spectroscopy, UV-visible spectroscopy, elemental analyses and single-crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P 21/c with a = 9.3053(17), b = 7.1125(13), c = 20.708(4), and β = 80.208(4)°. The antibacterial activities of the complex, ligand and metal salt were tested against Gram-positive bacteria Staphylococcus aureus and Gramnegativebacteria Escherichia coli studied by disk diffusion method. تفاصيل المقالة

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7 - Synthesis and Evaluation of Fatty Hydrazides Based on Schiff Bases from Oil Processing Industries Byproducts
D.S. Patel S. D. Toliwal J. V. Patel K. Jadav A. Gupte Y. Patel

Schiff bases of fatty acid hydrazides made from Oil recovered from spent bleaching earth (ORSBE) and Acid oil (AO)were prepared. These newly synthesized Schiff bases were characterized on the basis of FT-IR, elemental analysis and evaluated for biological performance. S أکثر

Schiff bases of fatty acid hydrazides made from Oil recovered from spent bleaching earth (ORSBE) and Acid oil (AO)were prepared. These newly synthesized Schiff bases were characterized on the basis of FT-IR, elemental analysis and evaluated for biological performance. Schiff bases exhibited mild antibacterial activities against certain micro-organisms if compared with streptomycin used as standard antibacterial agent and imidil used as a standard antifungal agent. تفاصيل المقالة

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8 - Synthesis of Single-Crystalline Octahedral Co3O4 with Solid-State Thermal Decomposition
Aliakbar Dehno Khalaji

In this paper, single crystalline octahedral Co3O4with dimensions about 100–500 nm and smooth surface has been prepared by solid-state thermal decomposition of cobalt(II) Schiff base complex Co((3,4-MeO-ba)2en)Cl2as new precursor at 450ºC under air atmosphe أکثر

In this paper, single crystalline octahedral Co3O4with dimensions about 100–500 nm and smooth surface has been prepared by solid-state thermal decomposition of cobalt(II) Schiff base complex Co((3,4-MeO-ba)2en)Cl2as new precursor at 450ºC under air atmosphere for 3.5 h. Surface morphology of the products were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). تفاصيل المقالة

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9 - Synthesis, characterization, antioxidant and antimicrobial activities of a heptadentate N4O3-type Schiff base ligand and its metal complexes
Roya Ranjineh Khojasteh Sara Jalali Matin

Mo(III), Fe(III), Cd(II), Zn(II), Cu(II) complexes based on Tris[2-salicylaldeneimino)ethyl]amine (H3saltren) have been successfully synthesized. Newly prepared compounds have been characterized by 1H-NMR, 13C-NMR, IR and UV–VIS spectroscopy techniques. The spectr أکثر

Mo(III), Fe(III), Cd(II), Zn(II), Cu(II) complexes based on Tris[2-salicylaldeneimino)ethyl]amine (H3saltren) have been successfully synthesized. Newly prepared compounds have been characterized by 1H-NMR, 13C-NMR, IR and UV–VIS spectroscopy techniques. The spectral studies confirmed the ligand coordinates the metal ion to form complex via the oxygen and nitrogen atoms of the phenolic group and azomethine group. The antioxidant activity of the ligand and its complexes were determined by DPPH (2,2-diphenyl-1-picryl-hydrazyl) method in vitro. The obtained IC50 value of the DPPH activity for the copper complex (IC50 = 55.30 mg/ml) was higher than other compounds. Furthermore, the antimicrobial effects of the tested compounds have been tested against the bacterial species, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Bacillus cereus by Disc diffusion and Micro-broth dilution methods. It has been found that the Cu complex has more effective against Bacillus cereus and the Cd complex showed the best antibacterial activity against the Staphylococcus aureus. تفاصيل المقالة

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10 - Synthesis and Characterization of New Schiff Bases of Ethylenediamine and Benzaldehyde Derivatives, Along with Their Iron Complexes
Rafeye Radfard Anita Abedi

Two new symmetrical Schiff bases have been prepared by the condensation of ethylenediamine and two benzaldehyde derivatives, 2-hydroxybenzaldehyde and 2,4-dimethoxybenzaldehyde. The electronic transitions within these Schiff bases molecules in chloroform solvent have أکثر

Two new symmetrical Schiff bases have been prepared by the condensation of ethylenediamine and two benzaldehyde derivatives, 2-hydroxybenzaldehyde and 2,4-dimethoxybenzaldehyde. The electronic transitions within these Schiff bases molecules in chloroform solvent have been investigated by UV-Vis spectroscopy. The1H NMR and IR spectra were studied and assigned to related groups. Furthermore, Two iron complexes with mentioned Schiff base have been synthesized by the reaction of titled ligands and transition metal ion, Fe (III) in the ratio of 1:1. The iron complexes have been characterized as well. تفاصيل المقالة

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11 - Antioxidant Activity and Electrochemical Properties of Tetradentate Schiff Bases and Their Cd(II) Complexes
Roya Ranjineh Khojasteh

This study describes the effects of the substituents on electrochemical behavior and antioxidant activity of the three tetradentate Schiff bases, containing ethane-1,2- diamine, propane-1,3- diamine and butan-1,4- diamine as the amine part and salicylaldehyde, and corre أکثر

This study describes the effects of the substituents on electrochemical behavior and antioxidant activity of the three tetradentate Schiff bases, containing ethane-1,2- diamine, propane-1,3- diamine and butan-1,4- diamine as the amine part and salicylaldehyde, and corresponding Cd(II) complexes. Cyclic voltammograms of these compounds were recorded in dimethylsulfoxide and 0.1 M sodium perchlorate as supporting electrolyte with glassy carbon as working electrode at different scan rates. The voltammograms of Schiff bases alone showed only one irreversible peak. Voltammograms recorded for complexes showed the presence of quasi-reversible processes taking place at the metal center and reversible process at the ligand part. Both steric and inductive effects of substituents and structure of imine bridge of Schiff base ligands as well as complexes were discussed. These effects appear relevant for the antioxidant activity. Antioxidant activity of the investigated compounds expressed as Trolox equivalent antioxidant capacity is also discussed. The electrochemical behavior showed a high correlation with the antioxidant activity for investigated compounds. تفاصيل المقالة

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12 - The Study of Corrosion Inhibition of Al-pure in HCl by Some New Organic Schiff Bases Using Chemical and Electrochemical Methods
Aesha S. Patel Vidhi A. Panchal Purdi T. Trivedi Nisha K. Shah

The inhibiting effects of some newly synthesized Schiff bases on the corrosion of Al-Pure in 1.0 M HCl have been studied by means of the chemical and electrochemical methods. The Schiff bases m-Chloroaniline-N-benzylidene (m-CANB), p-Chloroaniline–N-benzylidene (p أکثر

The inhibiting effects of some newly synthesized Schiff bases on the corrosion of Al-Pure in 1.0 M HCl have been studied by means of the chemical and electrochemical methods. The Schiff bases m-Chloroaniline-N-benzylidene (m-CANB), p-Chloroaniline–N-benzylidene (p-CANB), Benzylamine-N-(p-methoxy benzylidene) (BANPMB) and 2-Phenylethylamine-N-(p-methoxy benzylidene) (2PANPMB) were synthesized from benzyldehyde or substituted benzyldehyde with the corresponding amines and characterized by IR studies. The corrosion inhibition properties of these compounds on Al-Pure in 1.0 M HCl were investigated by weight loss, galvanostatic polarization and electrochemical impedance techniques. The weight loss study showed that the inhibition efficiency increases with increase in the concentration of the inhibitor and was found to be inversely related to temperature. The values of activation energy (Ea ), free energy of adsorption (∆Gads) and heat of adsorption (Qads) were calculated from the temperature data. The adsorption of these compounds on aluminium surface follows the Langmuir adsorption isotherm. The galvanostatic polarization data show that these compounds studied are mixed type inhibitors with predominant effect on the cathode. The mechanism of corrosion inhibition is also proposed. تفاصيل المقالة

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13 - An Alternative Method for Synthesis of Thermally Stable Aromatic Polyesters Containing Schiff Base Unites
Hossein Mighani Ehsan Fathollahi Mousa Ghaemy

In this paper, an efficient method for synthesis of aromatic polyesters containing schiff base units is described by preparation of two polyesters. These polyesters have been prepared by the reaction of terephthaloyl dichloride on Schiff bases derived from p-hydroxybe أکثر

In this paper, an efficient method for synthesis of aromatic polyesters containing schiff base units is described by preparation of two polyesters. These polyesters have been prepared by the reaction of terephthaloyl dichloride on Schiff bases derived from p-hydroxybenzyldehyde and 4,4-diamino diphenyl ether, 4,4-diamino diphenyl methane. The Polymers were characterized by IR, CHNS, thermal analyses (TGA) and viscosities. Inherent viscosities of polyesters were in the range of 0.28-0.31 dLg-1 and thermal stability determined by TGA in nitrogen atmosphere. تفاصيل المقالة

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14 - Uranyle Complexes: synthesis, evaluation of biological activity
Shahriar Ghammamy Rozita Hosseinzadeh Khezri Zahra Amini Monir Al-sadat Mirrahimi Masoud Soleimani Saeid Kaviani

In this research, some of the inorganic complexes of uranyl with N- donor ligandswere synthesized. Complexes were characteriezed by FT-IR and UV spectra, ¹HNMR,¹³CNMR and some physical properties. The uranyl unit (UO2) is composed of a center ofuranium at أکثر

In this research, some of the inorganic complexes of uranyl with N- donor ligandswere synthesized. Complexes were characteriezed by FT-IR and UV spectra, ¹HNMR,¹³CNMR and some physical properties. The uranyl unit (UO2) is composed of a center ofuranium atom with the charge (+6) and two oxygen atom by forming two U=O double bonds.The structure is linear (O=U=O, 180) and usually stable. So other ligands often coordinate tothe U atom in the plane perpendicularly to the O=U=O axis. The antitumor activity of some ofligand and their complexes against a panel of human tumor cell lines (HT29: Haman colonadenocarcinoma cell line T47D: human breast adenocarcinoma cell line) were determined byMTT(3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) assay. These datasuggest that some of these compounds provide good models for the further design of potentantitumor compounds. تفاصيل المقالة

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15 - Experimental and theoretical characterization of a new Schiff-base ligand
S. Ali Beyramabadi Ali Morsali Malihe Javan Khoshkholgh Abbas Ali Esmaeili

Here, new N,N′-dipyridoxyl(4,4''-diaminodiphenylether) Schiff-base ligand has been synthesized and characterized by IR, 1H NMR and mass spectrometry. Also, geometry optimization and theoretical assignment of IR spectrum of the ligand have been computed by employing dens أکثر

Here, new N,N′-dipyridoxyl(4,4''-diaminodiphenylether) Schiff-base ligand has been synthesized and characterized by IR, 1H NMR and mass spectrometry. Also, geometry optimization and theoretical assignment of IR spectrum of the ligand have been computed by employing density functional theory (DFT) method. Two pyridine rings and benzene rings in the bridge region are not in the same plane. The calculated results are good in agreement with the experimental ones, confirming validity of the optimized structure for the ligand. تفاصيل المقالة

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16 - Synthesis of some isatin Schiff bases in microwave irradiation condition
Mohammad K Mohammadi

An efficient and mild methodology for rapid and efficient synthesis of isatin Schiff bases was described under microwave irradiation and solvent free condition.aromatic or heterocyclic Primary amines and isatin could be selectively reacted under microwave irradiation in أکثر

An efficient and mild methodology for rapid and efficient synthesis of isatin Schiff bases was described under microwave irradiation and solvent free condition.aromatic or heterocyclic Primary amines and isatin could be selectively reacted under microwave irradiation into the corresponding isatin Schiff bases in high yields and short reaction time. تفاصيل المقالة

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17 - Excited State Proton Transfer Process In The 2-hydroxy –N-Salicylidene Schiff Base
Vali Alizadeh Ahmad Jamali moghadam

The Excited state reaction coordinates and the consequent energy profiles of a new Schiff Base N- Salicylidene-2-Bromoethylamine (NSBA) have been investigated at the CC2 level of theory. The electron-driven proton transfer and torsional deformation have been identified أکثر

The Excited state reaction coordinates and the consequent energy profiles of a new Schiff Base N- Salicylidene-2-Bromoethylamine (NSBA) have been investigated at the CC2 level of theory. The electron-driven proton transfer and torsional deformation have been identified as the most important photochemical reaction coordinates. The potential energy profiles of the ground and the lowest excited singlet state are calculated. In contrast to the ground state, the excited state potential energy profile shows a barrier-less dissociation pattern along the O–H stretching coordinate which verifies the proton transfer reaction at the S1 (ππ*) state. The calculations indicate S1/S0 conical intersections (CIs) which provide non-adiabatic gates for radiation-less decay to the ground state. At the CI, barrier-free reaction coordinates direct the excited system to the ground state of enol-type minimum. According to calculation results, a trans- keto type structure obtained from photoexcitation of the enol, can be responsible for the photo chromoic effect of title compound. Furthermore, our results confirm the suggestion that aromatic Schiff Bases are potential candidates for optically driven molecular switches. تفاصيل المقالة

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18 - Photo switching of Salicylidene methyl Furyl amine: A Theoretical Photo dynamics Study
Vali Alizadeh Ahmad Jamali moghadam

Potential energy surfaces (PES) for the ground and excited state intramolecular proton transfer (ESIPT) processes in N-salicilydene methyl furylamine(SMFA)have been studied usingCC2 level of theory. Our calculations suggest thenon-viability of ground state intramolecula أکثر

Potential energy surfaces (PES) for the ground and excited state intramolecular proton transfer (ESIPT) processes in N-salicilydene methyl furylamine(SMFA)have been studied usingCC2 level of theory. Our calculations suggest thenon-viability of ground state intramolecular proton transfer. Excited states PES calculations support the existence of ESIPT process in SMFA.The calculated results show that the intramolecular hydrogen bond were formed in the S0 state, and upon excitation, the intramolecular hydrogen bonds between - OH group and nitrogen atom would be strengthened in the S1 state, which can facilitate the proton transfer process effectively. The calculations indicate two S1/S0 conical intersections (CIs) which provide radiation-less decay to the ground state. At the CIs, two barrier-free reaction coordinates direct the excited system to the ground state of enol-type minimum.The keto-type S1 state attained by barrier less proton transfer is found to be unstable via a torsional motion, which provides fast access to a S1−S0 conical intersections. From the conical intersection, a barrier less reaction path directs the system back to the enol-type minimum of the S0 potential energy surface, thus closing the photocycle. تفاصيل المقالة

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19 - Cubic NiO Nanoparticles: Synthesis and Characterization
A.A. Dehno Khalaji D. Das J.S. Matalobos F. Gharib

In this paper, cubic nickel oxide nanoparticles were successfully prepared by solid-state thermal decomposition of nickel(II) macrocyclic Schiff-base complex at 450°C for 3 h without employing toxic solvent or surfactant and complicated equipment. nickel(II) macrocy أکثر

In this paper, cubic nickel oxide nanoparticles were successfully prepared by solid-state thermal decomposition of nickel(II) macrocyclic Schiff-base complex at 450°C for 3 h without employing toxic solvent or surfactant and complicated equipment. nickel(II) macrocyclic Schiff-base complex was synthesized by the reaction of 1,2-bis(2-formyl-3-methoxyphenyl)propane, NiCl2•6H2O and 1,3-phenylenediamine in methanol at room temperature and characterized by elemental analyses and FT-IR spectroscopy. The as prepared NiO nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD pattern result shows that the synthesized NiO nanoparticles are pure and single phase. The SEM and TEM results show the morphology of the as prepared NiO nanoparticles is almost cubic shape with the average size between 20-150 nm. On the basis of the above results, other transition metal macrocyclic Schiff base complexes are therefore potentially capable of forming metal oxide nanoparticles. تفاصيل المقالة

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20 - Synthesis, characterisation and catalytic activity of Schiff base Cu(II) metal complex
Imtiyaz Rasool Parrey Athar Adil Hashmi Babu Lal Swami Shaeel Ahmed AL-Thabaiti

This study reports the synthesis of chitosan anchored Schiff base, ([2-oxo-1H-indol-3-ylidene] amino) chitosan and its Cu (II) metal complex. The complex was characterized by elemental analysis, FT-IR Spectrum, thermogravimetry analysis .The crystallinity of the compoun أکثر

This study reports the synthesis of chitosan anchored Schiff base, ([2-oxo-1H-indol-3-ylidene] amino) chitosan and its Cu (II) metal complex. The complex was characterized by elemental analysis, FT-IR Spectrum, thermogravimetry analysis .The crystallinity of the compound was analyzed by powder X-ray diffraction technique. The catalytic efficiency of complex was studied in the oxidation of alcohols namely propanol, n-butanol, n-hexanol and benzyl alcohol using non toxic ecofriendly and easily available molecular oxygen as an oxidant. Furthermore the effects of various parameters including temperature, catalyst amount and effect of solvent have also been studied. The complex was found a suitable candidate in bringing out the oxidation reactions. تفاصيل المقالة

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21 - Hydrogen peroxide oxidation of primary alcohols by thiosemicarbazide Schiff base metal complexes
Maryam Tayebani Behroze Shafaat Marzi Iravani

A series of transition metal complexes with two thiosemicarbazide Schiff bases, 1-(4-dimethylaminobenzyl- idene)thiosemicarbazide (ABTSC) and 1-(2-pyridincarboxyl-idene) thiosemicarbazide (TCTS) were synthesized with Co(II), Ni(II), Zn(II), Cd(II) and Ag(I) salts (chlo أکثر

A series of transition metal complexes with two thiosemicarbazide Schiff bases, 1-(4-dimethylaminobenzyl- idene)thiosemicarbazide (ABTSC) and 1-(2-pyridincarboxyl-idene) thiosemicarbazide (TCTS) were synthesized with Co(II), Ni(II), Zn(II), Cd(II) and Ag(I) salts (chloride and acetate). These complexes were characterized by different methods including proton nuclear magnetic resonance (1HNMR), Fourier transform infrared (FT-IR), ultra violet visible (UV-Vis), molar conductance (λm), atomic absorption spectroscopy (AAS) and elemental analysis (CHNS). All complexes were applied as a catalyst for oxidation of aromatic alcohols. The effects of reaction time, temperature, catalyst amount, oxidant and solvents were investigated in detail. The oxidation of alcohols occurs effectively and selectively with H2O2 as the oxidant. For instance, 4-Methoxybenzyl alcohol is oxidized to the corresponding aldehyde with 95% conversion and 100 % benzaldehyde selectivity under the optimum conditions. تفاصيل المقالة

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22 - Mn(II)-Schiff base complex immobilized onto MCM-41 matrix as a heterogeneous catalyst for epoxidation of alkenes
Hassan Zakeri Saeed Rayati Goldasteh Zarei Ali Parsa Forogh Adhami

A heterogeneous catalyst containing manganese Schiff base complex (derived from 2,4-dihydroxybenzadehyde and 1,2-phenylenediamine) is produced by covalent anchoring in MCM-41 matrix. The synthesized catalyst was characterized by X-ray diffraction pattern (XRD), inductiv أکثر

A heterogeneous catalyst containing manganese Schiff base complex (derived from 2,4-dihydroxybenzadehyde and 1,2-phenylenediamine) is produced by covalent anchoring in MCM-41 matrix. The synthesized catalyst was characterized by X-ray diffraction pattern (XRD), inductivity coupled plasma (ICP), Fourier transform infrared (FT-IR) spectroscopy, N2 sorbtion-desorbtion isotherm and by transmission electron microscopy (TEM). The obtained catalyst was used in the epoxidation of alkenes with hydrogen peroxide. Furthermore, the effect of various parameters such as reaction time, temperature, amount of catalyst, oxidant and imidazole has been investigated. The catalyst reusability was investigated. Our result reveals that this catalyst shows high catalytic activity in the epoxidation of alkenes. تفاصيل المقالة

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23 - بررسی ویژگی پادقارچی و پادباکتریایی کمپلکس شیف ‌باز پالادیم (II) بر علیه سویه‌های بیماری‌زا مشترک میان‌ انسان‌ها و آبزیان
محمدرضا مقدم منش سمیه شهریاری سارا حسین زادگان

10.30495/jacr.2022.1935692.1962

کمپلکس های فلزی حاوی لیگاند شیف باز ترکیب هایی هستند که اثرهای زیستی مانند ویژگی پادقارچی، پادباکتریایی، پادمالاریایی، پادالتهاب، پادویروس و پادتب دارند. این ترکیب ها در صنایع متفاوت نیز مورداستفاده قرار می گیرند. در این مطالعه کمپلکس شیف باز پالادیم (II) با فرمول پی أکثر

کمپلکس های فلزی حاوی لیگاند شیف باز ترکیب هایی هستند که اثرهای زیستی مانند ویژگی پادقارچی، پادباکتریایی، پادمالاریایی، پادالتهاب، پادویروس و پادتب دارند. این ترکیب ها در صنایع متفاوت نیز مورداستفاده قرار می گیرند. در این مطالعه کمپلکس شیف باز پالادیم (II) با فرمول پیشنهادی C14H24N4O2Cl2Pd به روش گزارش شده در دانشگاه زابل تهیه شد و برای بررسی اثرهای پاد میکروبی مورداستفاده قرارگرفت. بررسی فعالیت پادمیکروبی مانند فعالیت پادباکتری بر علیه سویه های بیماری زا مشترک میان آبزیان و انسان شامل لاکتوکوکوس گارویه و ادوارد سیلا تاردا و فعالیت پادقارچی بر روی آسپرژیلوس فومیگاتوس و کاندیدا آلبیکنس بر پایه استاندارد CLSI صورت گرفت و نتیجه ها برمبنای قطر هاله عدم رشد، کمینه غلظت بازدارندگی رشد و کمینه غلظت کشندگی گزارش شد. برپایه نتیجه های به دست آمده، کمپلکس مورد مطالعه کمینه غلظت های بازدارندگی رشد 32 میکروگرم بر میلی لیتر و 64 میکروگرم بر میلی لیتر به ترتیب بر سویه های ادواردسیلا تاردا و لاکتوکوکوس گارویه از خود نشان داد. مقدار کمینه غلظت های بازدارندگی رشد بر سویه های قارچی آسپرژیلوس فومیگاتوس و کاندیدا آلبیکنس به ترتیب 512 میکروگرم بر میلی لیتر و 1024 میکروگرم بر میلی لیتر مشاهده شد. بررسی نتیجه ها نشان داد که کمپلکس شیف باز پالادیم (II)، ویژگی پادمیکروبی قوی و اثرگذاری بهتری نسبت به برخی از داروهای تجاری داشت. تفاصيل المقالة

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24 - برهم کنش کمپلکس پادتومور روی حاوی لیگاند شیف باز با آلبومین سرم انسانی و گاوی
سمیه شهرکی فاطمه خسروی

10.30495/jacr.2022.1946470.1997

در این پژوهش برهم کنش کمپلکس روی [Zn(SBL)2]Cl2 (SBL = لیگاند شیف باز ۲(-ایمینواتیل)پیپرازین دی استیل مونواکسیم) با پروتئین آلبومین سرم انسانی (HSA) و گاوی (BSA) در محیط تریس بافر حاوی ۱/۰ میلی مولار سدیم کلرید در سه دمای ۳۰۳، ۳۱۰ و ۳۱۷ کلوین با روش های طیف سنجی مورد أکثر

در این پژوهش برهم کنش کمپلکس روی [Zn(SBL)2]Cl2 (SBL = لیگاند شیف باز ۲(-ایمینواتیل)پیپرازین دی استیل مونواکسیم) با پروتئین آلبومین سرم انسانی (HSA) و گاوی (BSA) در محیط تریس بافر حاوی ۱/۰ میلی مولار سدیم کلرید در سه دمای ۳۰۳، ۳۱۰ و ۳۱۷ کلوین با روش های طیف سنجی مورد بررسی قرار گرفت. نتیجه های به دست آمده برای هر دو کمپلکس به تقریب مشابه بودند، به طوری که طیف سنجی فلورسانس نشان داد که خاموش سازی فلورسانس ذاتی هر دو پروتئین به دلیل برهم کنش کمپلکس روی از راه سازوکار خاموش سازی ایستا است. کمپلکس روی با تمایلی به تقریب مشابه،M-1 104Kb= ~، با هر دو پروتئین برهم کنش کرد. عامل های ترمودینامیکی مشارکت پیوند هیدروژن و برهم کنش های واندروالس را نشان داد، ولی نقش برهم کنش های آب گریزی به دلیل حضور گروه ایمین در ساختار کمپلکس و مقدار کوچک DS بی اهمیت نیست. تغییرهای ساختاری طی برهم کنش کمپلکس روی با دو پرروتئین مورد مطالعه با روش های فلورسانس هم زمان و سه بعدی و همچنین، دورنگ نمایی حلقوی مورد بررسی قرار گرفت. نتیجه های فلورسانس همزمان نشان داد که در حین برهم کنش کمپلکس با HSA و BSA تغییر قطبیت محسوسی در اطراف باقی مانده تریپتوفان رخ نمی دهد در حالی که در اطراف باقی مانده تیروزین قطبیت تغییر می کند. بررسی طیف سنجی دورنگ نمایی دورانی نیز کاهش محتوای مارپیچ آلفا در ساختار هر دو پروتئین را نشان می دهد. نتیجه های این پژوهش تایید می کند که برهم کنش کمپلکس روی در هر دو پروتئین به تقریب مشابه است. بنابراین، گاهی می توان در مطالعه های دارویی به جای پروتئین انسانی از هم خانواده حیوانی آن استفاده کرد. تفاصيل المقالة

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25 - بررسی اثرات زیستی ترکیبات سولفونامید-شیف باز پوشش داده‌شده با میکروذرات روی اکسید و مس (II) اکسید
محمد یوسفی مژگان تحریری معصومه طباطبایی خیراله مهرانی محمود دهقانی اشکذری

در این پژوهش، دو ترکیب سولفونامید-شیف باز 'N-‌(2-هیدروکسی-3-متوکسی بنزیلیدن)-4- متیل بنزوسولفونیل هیدرازید) و 1،2- بیس (2-هیدروکسی-3‌–‌ متوکسی بنزیلیدن هیدرازید) (1) و 'N-‌(2-هیدروکسی-3 متوکسی بنزیلیدن)-4-نیترو بنزوسولفونیل هیدرازید) و 1،2-بیس (2- هیدروکسی-3 متوکس أکثر

در این پژوهش، دو ترکیب سولفونامید-شیف باز 'N-‌(2-هیدروکسی-3-متوکسی بنزیلیدن)-4- متیل بنزوسولفونیل هیدرازید) و 1،2- بیس (2-هیدروکسی-3‌–‌ متوکسی بنزیلیدن هیدرازید) (1) و 'N-‌(2-هیدروکسی-3 متوکسی بنزیلیدن)-4-نیترو بنزوسولفونیل هیدرازید) و 1،2-بیس (2- هیدروکسی-3 متوکسی- بنزیلیدن هیدرازید) (2)) از گونه‌های سولفونیل کلرید و شیف باز سنتز شدند. ترکیبات سنتز شده با مس (II)‌ اکسید و روی اکسید پوشش داده شدند و از نظر فعالیت‌های ضدباکتری موردبررسی قرار گرفتند. ترکیبات شیمیایی تهیه‌شده، با طیف‌های رزونانس مغناطیسی هسته (NMR) و فروسرخ (FTIR)، الگوی پراش پرتو ایکس (XRD) و تجزیه عنصری شناسایی شدند. برای ریخت‌شناسی میکروذرات اکسید فلزی پیش و پس از پوشش‌دهی ترکیبات سولفونامید-شیف باز با آن‌ها، از میکروسکوپ الکترونی روبشی (SEM) استفاده شد. همچنین، فعالیت ضدباکتری ترکیبات در برابر دو باکتری گرم مثبت (استافیلوکوکوس اپیدرمیدیس و استافیلوکوکوس ساپروفیتیکوس) و یک باکتری گرم منفی (پروتئوس میرابیلیس) بررسی شد. نتایج به‌دست آمده نشان می‌داد که فعالیت ضدباکتری ترکیبات سولفونامید-شیف باز خالص در برابر باکتری‌های گرم مثبت و منفی نسبت به ترکیبات سولفونامید-شیف باز پس از پوشش‌دهی با میکرواکسیدهای فلزی کمتر است. لازم به‌ذکر است که آمپیسیلین و پنسیلین به‌عنوان داروهای استاندارد برای بررسی فعالیت ضدباکتری مورداستفاده قرار می‌گیرند. تفاصيل المقالة

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26 - مطالعه برهم‌کنش DNA تیموس گاوی با کمپلکس رنیم (I)تری‌کربونیل با لیگاند شیف‌باز دودندانه با روش‌های متفاوت طیف‌سنجی
مریم بردبار فریبا طاووسی علی یگانه فعال اکبر رستمی ورتونی

توانایی پیوند و برهم‌کنش کمپلکس رنیم (I) تری‌کربونیل شامل لیگاند دی‌ایمینی ['N,N_بیس (بنزآلدهید)-1و2–دی ایمینواتان] و با نام اختصاری [Re]، به DNA استخراج‌شده از تیموس گوساله (CT-DNA) با روش‌های طیف‌نورسنج UV-Vis، طیف‌سنجی فلورسانس، طیف دورنگ‌نمایی دورانی (CD)، دنا أکثر

توانایی پیوند و برهم‌کنش کمپلکس رنیم (I) تری‌کربونیل شامل لیگاند دی‌ایمینی ['N,N_بیس (بنزآلدهید)-1و2–دی ایمینواتان] و با نام اختصاری [Re]، به DNA استخراج‌شده از تیموس گوساله (CT-DNA) با روش‌های طیف‌نورسنج UV-Vis، طیف‌سنجی فلورسانس، طیف دورنگ‌نمایی دورانی (CD)، دناتوره شدن گرمایی و ولتامتری چرخه‌ای (CV) بررسی شده است. تجزیه و تحلیل داده‌های طیفی هر کدام از این روش‌ها، به‌طور مجزا اطلاعاتی در خصوص چگونگی پیوند یادشده می‌دهد. در مجموع، از جمع داده‌های طیف‌نورسنج UV-Vis، طیف دورنگ‌نمایی دورانی CD و دناتوره شدن گرمایی، نوع و مقدار برهم‌کنش کمپلکس‌ها با DNA تعیین و تغییرهای ساختار DNA بررسی شد. (Kb) ثابت پیوند کمپلکس با DNA، با استفاده از داده‌های طیف‌نورسنج UV-Vis محاسبه شد. نتایج نشان داد که کمپلکس [Re]، نسبت به سایر کمپلکس‌های شیف‌باز، به‌طور نسبی برهم‌کنش خوبی دارند. در همه آزمایش‌ها، برهم‌کنش را از طریق جایگیری جزیی و الکتروستاتیک پیشنهاد می‌کنند. البته برهم‌کنش از طریق جایگیری غالب است، چون بیشتر آزمایش‌ها این نوع برهم‌کنش را تأیید کردند. تفاصيل المقالة

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27 - Anti-inflammatory and antimicrobial studies of biosensitive Knoevenagel condensate β-ketoanilide Schiff base and its Co(II), Ni(II), Cu(II) and Zn(II) complexes
Natarajan Raman Ramaraj Jeyamurugan Jeyasekaran Joseph

A new series of transition metal complexes of Co(II), Ni(II), Cu(II) and Zn(II), has beensynthesized from the Knoevenagel condensate Schiff base ligand(L) derived from β-ketoanilideand furfural with o-phenylenediamine and diethylmalonate. Structural features were d أکثر

A new series of transition metal complexes of Co(II), Ni(II), Cu(II) and Zn(II), has beensynthesized from the Knoevenagel condensate Schiff base ligand(L) derived from β-ketoanilideand furfural with o-phenylenediamine and diethylmalonate. Structural features were determinedby spectral and analytical techniques. Square-planar geometry has been adopted by thecomplexes except cobalt complex which has an octahedral geometry. The synthesized ligand andits complexes were screened for their anti-inflammatory activity in male albino rats(Carrageenan-induced rat paw oedema model). Among these complexes, copper complex showssignificant anti-inflammatory activity. It exhibits significant dose dependent activity in acuteinflammation. The doses of 100 and 200 mg kg-1 bw produced 38.3 % and 42.8 % inhibitionrespectively after 3 h as compared with that of the standard drug (indomethacin) which showed48.5 % inhibition. The in vitro antimicrobial activity of the ligand and its complexes wasmonitored by disc diffusion method. It has been found that complexes have higher antimicrobialactivity than that of free ligand. تفاصيل المقالة

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28 - DNA interaction and antimicrobial studies of novel copper (II) complex having ternary Schiff base
Natarajan Raman Thanasekaran Baskaran Abraham Selvan Ramaraj Jeyamurugan

A novel ternary Schiff base ligand (HL) of ONO type and its copper (II) complex weresynthesised using 2-aminophenol and o-acetoacetotoluidide. They have been characterised by theusual analytical and spectral methods. The interaction of the complex with calf-thymus (CT)D أکثر

A novel ternary Schiff base ligand (HL) of ONO type and its copper (II) complex weresynthesised using 2-aminophenol and o-acetoacetotoluidide. They have been characterised by theusual analytical and spectral methods. The interaction of the complex with calf-thymus (CT)DNA has been investigated by UV-Vis, viscosity measurement, cyclic voltammetry anddifferential pulse voltammetry studies. The results show that the complex binds to CT DNA byintercalating way. The CT DNA cleavage study was monitored by gel electrophoresis method.From this study, it was found that the complex cleaves CT DNA in presence of the oxidant,hydrogen peroxide. The in vitro antimicrobial activities of the synthesized compounds have beentested against the bacteria Salmonella typhi, Staphylococcus aureus, Bacillus subtilis,Escherichia coli, Pseudomonas putita and Klebsiella pneumoniae and fungi Aspergillus niger,Aspergillus flavus, Rhizopus stolonifer, Candida albicans and Rhizoctonia bataicola by welldiffusion method. The Minimum Inhibitory Concentration (MIC) value against the growth of theabove microorganisms is much larger for copper complex than the ligand. تفاصيل المقالة

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29 - Cu(II) and Zn(II) complexes with unsymmetrical tetradentate Schiff base ligands: Synthesis, spectral characterization, antimicrobial assay and DNA binding property
Natarajan Raman Rajkumar Mahalakshmi Abraham Selvan Muthusamy Selvaganapathy

The reaction of copper(II) chloride and zinc(II) chloride with N-(2-methylphenyl)-3-(1'-salicylaldehydene-2'-imine-ethane)-butanamide(H2L2a) or (MPSB), N-(2-methylphenyl)-3-(1'-(3'-methoxysalicylaldehydene-2'-imine-ethane)-butanamide (H2L2b) or (MPMSB) and N-(2-methylph أکثر

The reaction of copper(II) chloride and zinc(II) chloride with N-(2-methylphenyl)-3-(1'-salicylaldehydene-2'-imine-ethane)-butanamide(H2L2a) or (MPSB), N-(2-methylphenyl)-3-(1'-(3'-methoxysalicylaldehydene-2'-imine-ethane)-butanamide (H2L2b) or (MPMSB) and N-(2-methylphenyl)-3-(1'-(2'-hydroxyacetylene-2'-imine-ethane)-butanamide (H2L2c) (MPHB) leads to the formation of a series of new complexes and theyhave been characterized by the spectral and analytical techniques. For the complexes [CuL2a-c] and [ZnL2ac],the central metal ion is coordinated to two azomethine nitrogen atoms and one phenolic oxygen atom ofthe aromatic aldehydes as well as 2-hydroxyacetophenone and enolic oxygen atom of the 2'-methylacetoacetanilide. DNA binding studies reveal the stronger binding capability of the present copper(II)complexes, confirmed by the absorbance, cyclic voltammetry, differential pulse voltammogram andviscometric studies. Similarly, remaining complexes do the same in the ligand field with less bindingconstants. In addition, fungistatic and bacteriostatic activities of both ligands and complexes have beenevaluated. copper(II) complexes have shown the most significant activities. تفاصيل المقالة

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30 - Spectroscopic evidence of Cu(II) and Zn(II) complexes having amino acid based Schiff base: A special emphasis on in vitro antimicrobial, DNA binding and cleavage studies
Natarajan Raman Abraham Selvan Arunagiri Sakthivel

A new Schiff base ligand (L) obtained by the condensation reaction of N-acetylaceto-otoluidineand 2-aminopropanoic acid (an amino acid), is used to synthesize four mononuclearcomplexes of [MLCl] and [ML2] types (where M = Cu(II) and Zn(II); L = Schiff base) bykeeping th أکثر

A new Schiff base ligand (L) obtained by the condensation reaction of N-acetylaceto-otoluidineand 2-aminopropanoic acid (an amino acid), is used to synthesize four mononuclearcomplexes of [MLCl] and [ML2] types (where M = Cu(II) and Zn(II); L = Schiff base) bykeeping the metal and ligand ratio as 1:1 and 1:2 respectively. This ligand and its complexeshave been characterized on the basis of different spectral methods. EPR, UV-Vis. and magneticmoment data afford a square-planar geometry for the [MLCl] complexes and octahedralgeometry for the [ML2] complexes. The observed low molar conductivity of these complexes atroom temperature is consistent with their non-electrolytic nature. All the complexes displaysignificant oxidative cleavage of circular plasmid pBR322 DNA in the presence of hydrogenperoxide. UV spectroscopic titration with CT DNA reveals that the complexes can bind to CTDNA and the binding constants to CT DNA have been calculated. The cyclic voltammograms ofthe complexes in the presence of CT DNA reveal that they bind to CT DNA probably by theintercalative binding mode. The antimicrobial activity of the complexes has been tested againstmicroorganisms showing that they exhibit higher activity than free Schiff base ligand. تفاصيل المقالة

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31 - Synthesis and Biological Activity of a New Schiff Base Ligand Pyridazine Based
M. H. Fekri M. Darvishpour H. Khanmohammadi M. Rashidipour

10.22034/jchr.2018.544049

In this work 3, 6-bis (2-[2-sulfanyl-ethylimino)-methyl]-4-(4-nitro-phenylazo)-3-metoxy-phenol) pyridazine (2) was prepared and its antibacterial properties have studied. The structures of all the newly synthesized compounds have been comfirmed by elemental analysis, IR أکثر

In this work 3, 6-bis (2-[2-sulfanyl-ethylimino)-methyl]-4-(4-nitro-phenylazo)-3-metoxy-phenol) pyridazine (2) was prepared and its antibacterial properties have studied. The structures of all the newly synthesized compounds have been comfirmed by elemental analysis, IR, 1H-NMR. Anti bacterial effects of compounds (1 and 2) have been studied. Following concentrations of materials were used: a=0.005 g/ml and b=0.01 M. Study was done on two strains of S.aureus and E.coli that experiments were done in Trypticase Soy Broth (TSB) and Nutrien Agar (TSB; Difco Laboratory). It is likely that these synthetic materials exert higher antibacterial effect on gram positive bacteria in comparison with gram negative. تفاصيل المقالة

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32 - Synthesis, Characterization and Study the Biological Activity of Some New Heterocyclic Compounds Derived from Terephthalic Acid
Eman M. Hussain Rajaa K. Baqir Jumbad H. Tomma

10.22034/jchr.2023.1976713.1665

The organic compound imidazole has the chemical formula C3N2H4. Numerous significant biological compounds contain imidazole. The amino acid histidine is the most prevalent. The substituted imidazole derivatives have great potential for treating a variety of systemic fun أکثر

The organic compound imidazole has the chemical formula C3N2H4. Numerous significant biological compounds contain imidazole. The amino acid histidine is the most prevalent. The substituted imidazole derivatives have great potential for treating a variety of systemic fungi infections. Thiourea is an organosulfur compound with the formula SC(NH2)2. It is a reagent in organic synthesis. In this paper, some new imidazole and thiourea derivatives are synthesized, characterized, and studied for their biological activity. These new compounds were synthesized from the starting material terephthalic acid, which was transformed to corresponding ester [I] by the refluxing of diacid with methanol in the presence of H2SO4 as a catalyst, compound [I] condensation with hydrazine hydrate 80% to yielded acid hydrazide [II], which was refluxed with 2 moles of various aromatic aldehydes in the presence of few drops of glacial acetic acid as a catalyst to yielded Schiff bases . Refluxing of chosen derivative with acetyl chloride in dry benzene gave new acetyl compounds which were reacted with thiourea and anhydrous sodium carbonate with acetone as a solvent to give new thiourea derivatives . Compounds were used to synthesize new imidazole derivatives by the reaction of appropriate compound with 2 moles of benzoin in dry DMF under cyclization reaction. FTIR, 1HNMR, and mass spectroscopy are used to characterize the synthesized compounds. تفاصيل المقالة

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33 - بازدارندگی خوردگی پلی اتیلن گلایکل روی خوردگی فولاد ساده کربنی در محیط اسید سولفوریک و هم نیروزایی آن با شیف باز
سینا جهادی مجتبی نصر اصفهانی

در این تحقیق تاثیر بازدارندگی کمپلکس های شیف باز-پلی اتیلن گلایکل و میزان هم نیروزایی آن ها بر خوردگی فولاد ساده کربنی در محلول اسید سولفوریک 0/5 مولار در دماهای 25 ، 45 و 65 درجه سانتی گراد مورد بررسی قرار گرفته است. شیف باز N و Nˊ بیس (سالیسیل آلدهید)-1و3 دی آمینو پرو أکثر

در این تحقیق تاثیر بازدارندگی کمپلکس های شیف باز-پلی اتیلن گلایکل و میزان هم نیروزایی آن ها بر خوردگی فولاد ساده کربنی در محلول اسید سولفوریک 0/5 مولار در دماهای 25 ، 45 و 65 درجه سانتی گراد مورد بررسی قرار گرفته است. شیف باز N و Nˊ بیس (سالیسیل آلدهید)-1و3 دی آمینو پروپان (سالپن ) از واکنش سالیسیل آلدهید و 1 و 3 پروپان دی آمین سنتز شد. کمپلکس های پلی اتیلن گلایکل – شیف باز با نسبت های وزنی 4:1 ، 4:2 و 4:3 شیف باز و پلی اتیلن گلایکل تحت شرایط رفلاکس در حلال دی کلرومتان سنتز شد.آزمون های کاهش وزن، پلاریزاسیون و طیف سنجی آمپدانس الکتروشیمیایی نشان داد که کمپلکس های پلی اتیلن گلایکل-شیف باز در مقایسه با پلی اتیلن گلایکل و شیف باز بصورت جداگانه و یا مخلوط تاثیر بازدارندگی مطلوب تری در خوردگی فولاد ساده کربنی در محیط اسید سولفوریک 0/5 مولار دارد. میزان بازدارندگی کمپلکس های شیف باز و پلی اتیلن گلایکل برای نسبت وزنی 4:1 شیف باز و پلی اتیلن گلایکل دارای بهترین راندمان بود و افزایش درجه حرارت محلول موجب افزایش راندمان بازدارندگی کمپلکس های شیف باز و پلی اتیلن گلایکل تا دمای 45 درجه سانتی گراد و کاهش آن در دماهای بالاتر شده است. سطوح خوردگی نیز با استفاده از میکروسکوپ الکترونی نیز بررسی شد که آن نتایج با نتایج قبلی هماهنگ بود. داده های ترمودینامیکی جذب (K_ads و 〖∆G〗_ads ) با استفاده از داده های کاهش وزن محاسبه شد. تفاصيل المقالة

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