Kinetics of interaction of the [Pd2Cl2(tppz)](2+) ...

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Title Kinetics of interaction of the [Pd2Cl2(tppz)](2+) cation with guanine in aqueous DMSO, and solvatochromic properties of the complex in aqueous DMSO mixtures
Author(s) A. M. Corcoran, Robert I. Haines
Journal Inorganic Reaction Mechanisms
Date 2006
Volume 6
Issue 2
Start page 83
End page 89
Abstract The binuclear complex bis-(chloropalladium(II))-tetrakis(2-pyridyl)pyrazine chloride, [Pd2Cl2(tppz)]Cl-2 has been synthesized and characterized. The complex shows solvatochromic behaviour in aqueous DMSO solvent mixtures. The kinetics of nucleophilic substitution of the complex by guanine is reported in 20% by volume aqueous DMSO. Only mono-substitution is observed, the dominant pathway being disscciative in nature. Temperature dependent studies give activation enthalpy and entropy values Delta H-double dagger=62.1 +/- 3.5 kJ mol(-1) and Delta S-double dagger=-67 +/- 10 J.K(-1)mol(-1). The reaction is completely suppressed in the presence of added chloride.

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