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The coordination complexes of Pt(PL) 2 Cl 2  type (PL = monodentate P-donor ligands) cover almost 260 examples as shown by a recent survey covering the crystallographic and structural data. About 20% of these complexes exist as isomers and are summarized in this review. Included are distortion (58.5%),  cis -,  trans - (37.8%) and mixed isomerism ( cis -,  trans - and distortion) (3.7%). Distortion isomers, differing by degree of distortion in Pt-L and L-Pt-L angles, are the most common. For these derivatives the most common  cis - arranged with 31 examples and 22 examples with  trans - arranged. The complexes with  cis -configuration are more distorted than their  trans -partners, with the comprehensive values of Pt-L bond distances: 2.246 Å (P) and 2.350 Å (Cl). Such values in the complexes with  trans -configurations are 2.323 Å (P) and 2.308 Å (Cl), respectively. These are discussed with attention to any  trans -influence.

Stereoisomers of Pt(PL) 2 Cl 2 derivatives – structural aspects