Synthesis and Characterization of Homo and Hetero Multi-Nuclear Complexes of Platinum Group Metals with Some New Tetrasubstituted Thioethene Derivatives

Abstract

The new tetra-substituted thioethene derivatives R₂C=CR₂ (R = xanthate,
dithiocarbamate, dithiophosphate) react with one or mixture of two
of the salts NiCl₂.6H₂O, Na₂PdCl₄ and K₂PtCl₄ in 1 : 2 or 1 : 4 (ligand to
metal) molar ratio, respectively, to yield homo or hetero multi-nuclear
complexes of the general formula MM'LCl₄ and M₂M'₂LCl₈, where
M ≠ M' or M = M' = Ni, Pd, Pt. The complexes were characterized by their
elemental analyses, IR and UV-vis. spectroscopy, conductivity and magnetic
measurements. Conductivity data in DMSO and acetonitrile showed
that some of the complexes are non-conductive assigning the formulae
[MM'LCI₄] or [M₂M'₂LCl₈] and some of the them are 1 : 4 conductive
assigning the formulae [MM'L]CI₄ or [M₂M'₂LCl₄]CI₄. Explanations for
the structural elucidation of these complexes are given and discussed.