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The coordination chemistry of platinum (Pt) covers a huge field as shown by a recent survey covering the crystallographic and structural data of almost 200 monomeric examples of the Pt(η 2 -P 2 L)Cl 2  type. About 20% of these complexes exist as isomers and are discussed in this review. Included are distortion (64%),  cis - trans  (20%), and ligand (16%) isomers. These are discussed in terms of the metallocyclic rings, and coordinations are drawn between donor atoms, bond lengths, and interbond angles, with attention to any  trans -influence. Distortion isomers, differing only by the degree of distortion in Pt-L and L-Pt-L angles, are the most numerous. In this series of distortion and ligand isomers, the square-planar configuration about the Pt(II) atom has only  cis -configuration. The total mean values of Pt-L bond distances ( cis - vs.  trans -configuration) are 2.228 Å (P) and 2.353 Å (Cl) vs. 2.312 (P) and 2.302 Å (Cl).

Stereochemistry of Pt(η 2 -P 2 L)Cl 2 derivatives