Reference of cis-Dichlorobis(pyridine)platinum(II). So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: cis-Dichlorobis(pyridine)platinum(II), is researched, Molecular C10H10Cl2N2Pt, CAS is 15227-42-6, about Volumes of activation for the substitution reactions of cis- and trans-[PtL2(Cl)X] with pyridine in various solvents.
The pressure dependence of the 2nd-order rate constant for the substitution of pyridine for Cl in trans-[Pt(py)2(Cl)(NO2)] was measured in the solvents nitromethane, methanol, ethanol, and dichloromethane. The resp. ΔV*exptl. values were calculated to be -6.2 ± 0.4 at 10°, -8.8 ± 0.6 at 25°, -13.1 ± 0.8 at 25°, and -19.8 ± 1.7 cm3 mol-1 att 25°. The ΔVexptl. values for the corresponding reactions of cis-[Pt(py)2(Cl)(NO2)] and trans-[Pt(PEt3)2Cl2] in methanol at 25° are -5.5 ± 0.5 and -13.6 ± 0.8 cm3 mol-1, resp. These ΔV*exptl.’s were found to be only slightly temperature dependent. The activation parameters ΔH*2 and ΔS*2 were also determined for each reaction. The volume change associated with the partial formation of the Pt-pyridine bond was estimated to be -4 ± 1 cm3 mol-1. A qual. explanation of the solvent dependence of ΔV*exptl. is also given.
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