Abstract
The rates of spontaneous cis-trans isomerization of the complex cis-[PtCl 2(PBu 3)(PhCN)] have been measured in different solvents. Values of k obs decrease with the polarity of the solvent (benzene ∼ toluene $ ̆ CHCl 3 ∼ DMF). 31P and 195Pt NMR spectroscopy provide (for the first time) strong evidence for dimer formation (sym. trans-[Pt 2(μ- Cl) 2(Cl) 2(PBu 3) 2]) which are intermediates in spontaneous cis/trans isomerization.
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