The decomposition and formation of the platinum-thallium bond in the [(CN)5Pt-Tl(edta)]4− complex: kinetics and mechanism

The formation of [(CN)5Pt-Tl(edta)]4− complex can proceed via two different pathways depending on the ratio of the cyanide and the edta ligand. The 'direct path' at excess of edta means the formation of a [(CN)4Pt…Tl(CN)(edta)]4− intermediate followed by the release of the cyanide from the Tl-center than the coordination of a cyanide from the bulk to the Pt-center of the intermediate. The 'indirect path' dominates in the absence of extra edta and the formation of the Pt-Tl bond happens between Pt(CN)42− and Tl(CN)4− as studied earlier in our laboratories.