Thermodynamic Parameters of Cis-Platin and Trans-Platin Complexes with Guanine in Water, A DFT Study

Subject Areas : Journal of Physical & Theoretical Chemistry

F. R. Nikmaram ¹ , M. Khan Ahmadi ²

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Received: 2014-07-21 Accepted : 2014-07-21 Published : 2014-01-01

Keywords: cis-Pt, trans-Pt, Guanine, binding energy, Thermodynamic Parameters,

Abstract :

The binding energy and Thermodynamic Parameters of cis- Platinum Di Ammino Chlorine (cis-[Pt(NH3)2Cl]+) and trans- Platinum Di Ammino Chlorine (trans- [Pt(NH3)2Cl]+) complexes withGuanine has been studied by density functional theory (DFT) calculations in water. The bindingenergies (Ebin) of cis- and trans-[Pt(NH3)2ClG]+ are calculated to be 79.38 kcal/mol and 74.98kcal/mol, respectively. The binding energy (Ebin) of cis-[Pt(NH3)2ClG]+ turns out to be energeticallymore favorable by about 1.88 kcal/mol than the trans-[Pt(NH3)2Cl]+. At the point of thermodynamic,the formation of cis-[Pt(NH3)2ClG]+(aq)with
G (Solv) equal to -10.36 kcal/mol is more favorablethan trans-[Pt(NH3)2ClG]+(aq) with 16.21 kcal/mol.