Crystalographic and structural characterization of heterometallic platinum compounds. Part III: heterotrinuclear compounds

摘要

This review ar ticle includes over three hundred and sixty heterotrinuclear platinum complexes of the composition Pt 2 M (205 examples), PtM2 (132 examples) and PtMM (24 examples). The heterometals include the non-transition and transition metals. Three metal atoms form a wide variability of frameworks: M3 triangular, dicapped M3 triangular, V shaped M3 , M3 linear, fve-, six- and seven- metallocycles and unique structures of which triangular and linear are the most common. This has led to a rich chemistry of platinum not only from variability of metals, but also from their framework and stereochemistry. The shor test Pt-M (non-transition) and Pt-M (transition) bonds are 2.315(1) A for Pt-Ga and 2.4896(9) A for Pt-Co. The shor test Pt-Pt bond distance is 2.581(1) A. Two complexes exist in two isomeric forms and several others contain crystallographically independent molecules. All are typical examples of distor tion isomerism. Correlations between structural parameters, heterometal and ligand donor atoms are developed and discussed.