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Open Access Article
1 - Comparison of DPPH and FRAP Assays for Determination of Antioxidant Activity of electro-synthesized Polypyrrole /graphene nanocomposite
nafiseh hajiabdolah Mohammad YousefiThis study is in investigated the antioxidant effects of polypyrrole and grapheme nanocomposite on 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and Ferric reduction activity potential (FRAP). The electrosynthesis of this nanocomposite on the tip of a graphite penci MoreThis study is in investigated the antioxidant effects of polypyrrole and grapheme nanocomposite on 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical and Ferric reduction activity potential (FRAP). The electrosynthesis of this nanocomposite on the tip of a graphite pencil by cyclic voltammetry (CV) in the potential range -0.4 to 1.2V at the 5 mL of phosphoric acid (H3PO4), in the presence of potassium chloride (KCl) electrolyte supplements as an inorganic salt and p-Toluene sulfonic acid (pTSA) as an organic salt was performed. Antioxidant capacity was determined using Uv-vis spectroscopy. Also, FT-IR Spectroscopy and scanning electron microscopy (FESEM) were used to study the surface structure and topography of nanocomposite.Polypyrrole-graphene nanocomposite has antioxidant properties and increases the absorption rate at FRAP = λmax596 nm by reducing iron ions and reducing the absorption rate in DPPH = λmax516 nm by the transition of electrons and destroying DPPH free radicals. Also, this nanocomposite in the presence of p-Toluene sulfonic acid has a higher antioxidant capacity than the presence of potassium chloride. Manuscript profile -
Open Access Article
2 - Study of oxidation coupling of thiols to disulfides with Tripropylammonium fluorochromate (VI) (TriPAFC) in convenient and microwave conditions
Mohammad hosein farjam Amal BerisamTripropylammonium fluorochromate is an efficient and new reagent, which prepares easily and oxidizes thiols to the corresponding disulfides quickly. The reactions perform cleanly and controlled to stop at the disulfide stage without over-oxidation side products. Couplin MoreTripropylammonium fluorochromate is an efficient and new reagent, which prepares easily and oxidizes thiols to the corresponding disulfides quickly. The reactions perform cleanly and controlled to stop at the disulfide stage without over-oxidation side products. Coupling of thiols to their corresponding disulfides studied in solution at room temperature and in solution under microwave radiation. The easy procedure, simple work-up, short reaction times, and excellent yields are another advantages of this reagent. Manuscript profile -
Open Access Article
3 - Making epoxy/copper ferrite and copper hydroxide composite using nanoparticles synthesized by hydrothermal and ultrasonic method and checking the thermal properties of composites
Elaf ayad Kamel Aljahlavi Mohammad Moarrefi Romeileh Azadeh Azami GheymasiIn this research, nanoparticles of copper ferrite was synthesized by hydrothermal method and nanoparticles of copper hydroxide was synthesized by ultrasonic method. Then, to check the properties of these nanoparticles, analyzes such as X-ray diffraction pattern (XRD), s MoreIn this research, nanoparticles of copper ferrite was synthesized by hydrothermal method and nanoparticles of copper hydroxide was synthesized by ultrasonic method. Then, to check the properties of these nanoparticles, analyzes such as X-ray diffraction pattern (XRD), scanning electron microscope (SEM), vibrating sample magnetometry (VSM) and infrared spectroscopy (IR) were taken. The results of analyzes showed that the nanoparticles were prepared in a completely uniform, fine and homogeneous manner and no agglomeration was seen in them. In addition, these nanoparticles had good magnetic properties and the peaks of the X-ray diffraction pattern were consistent with the standard peaks. In the next step, 5% by weight of copper ferrite and copper hydroxide nanoparticles were added to the epoxy resin and then mixed together by a stirrer. In the next step, the epoxy resin was subjected to ultrasonic waves and after the complete distribution of nanoparticles in the field, it was placed in the vacuum chamber for bubble removal and finally poured into the mold. Finally, various tests were taken from the composites, such as: thermal properties test (TGA) and flame resistance test (UL-94). Manuscript profile -
Open Access Article
4 - Modern Advances in Click Reactions and applications
Shedrach Yakubu Emmanuel EtimA mechanism of surface fictionalization, often referred to as click reaction, is the most widely used and accepted synthetic pathways in chemical processes today. This reaction has been used in a variety of synthesis and molecular modification applications, including bi MoreA mechanism of surface fictionalization, often referred to as click reaction, is the most widely used and accepted synthetic pathways in chemical processes today. This reaction has been used in a variety of synthesis and molecular modification applications, including biosciences, polymer sciences, material sciences, drug delivery, and the list is endless. The azide-alkyne 'click' reaction catalyzed by a metal is the most essential component to this early milestone. It is no exaggeration to claim that click chemistry has prepared the way for modern civilization in chemistry, and is thus an eye opener to current scientific practice. This paper outlines some of the key elements that have contributed to the clicks' character, as well as how they provide certain elements of perspective for scientific applications. As a result, the findings of this study imply that the chemistry of click reactions has emerged as a useful tool in biological and material chemistry. Manuscript profile -
Open Access Article
5 - Convenient Synthesis of benzo[f][1,3,4]thiadiazocin derivatives
Mohsen NikpourCondensation of some alkyl-2-phenylhydrazinecarbodithioates with 2-chloromethylbenzoylchloride in alkaline boiling acetonitrile afford a group of 7-(alkylsulfanyl)-9-phenyl-5H- benzo[f][1,3,4]thiadiazocin-10(9H)-ones.Condensation of some alkyl-2-phenylhydrazinecarbodithioates with 2-chloromethylbenzoylchloride in alkaline boiling acetonitrile afford a group of 7-(alkylsulfanyl)-9-phenyl-5H- benzo[f][1,3,4]thiadiazocin-10(9H)-ones. Manuscript profile -
Open Access Article
6 - Investigation of aromatic compounds to achieve the use of borazine part for the design of molecular dyes
Mansour Nasiri Iman Khosravi Melika EftekharAromatics form a wide group of compounds that include benzene and compounds that are similar to benzene in terms of chemical behavior. Unlike alkenes and alkynes, benzene and other aromatic compounds do not show a tendency to carry out addition reactions, in this resear MoreAromatics form a wide group of compounds that include benzene and compounds that are similar to benzene in terms of chemical behavior. Unlike alkenes and alkynes, benzene and other aromatic compounds do not show a tendency to carry out addition reactions, in this research, aromatic compounds were investigated to achieve the use of the borazine part for the design of molecular dyes. After collecting the data, Hyper Chem 8.0.3 Gaussian Viewer, Chem Draw software were used to analyze the data. The results obtained from hyperpolarizability calculations showed that the magnitude of the first hyperpolarizability tensor of all molecules is relatively average, and NO2 and NH2 have the highest amounts of N and B isomers, respectively. Also, the calculations showed that the first hyperpolarizability value of the isomer is higher than the isomer B with the substitutions removed. On the other hand, these amounts of the N isomer are lower than the β isomer with donor substitutions. Manuscript profile
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