We present here both an ab initio and quantum mechanical/molecular mechanical (QM/MM) study of the cis-[Pt(NH3)2Cl4] complex reduction by methyl thiolate anion, SCH(-3), which is used as a model of glutathione. Geometry and electronic structure of cis-[Pt(NH3)2Cl4] are determined without and in aqueous medium. The mechanism of the reaction of reduction is characterized. The calculated activation energy of the reaction compares remarkably well with the experimental value.
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