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In this review, the structural parameters of distortion isomers of cis-monomeric Pt(II) coordination complexes with inner coordination spheres: Pt(PL) 2 X 2  (X = OL, NL, SL, Br, I); Pt(PL) 2 (η 2 -X 2 L) (X = O 2 L, N 2 L, S 2 L, OSL, NSL, NSeL); Pt(η 2 -P 2 L)X 2  (X = Br, I); Pt(η 2 -P 2 L)(η 2 -X 2 L) (X = O 2 L, OSL, NSL); Pt(η 2 -P 2 L)(NL)(Cl) and Pt(PL)(η 2 -P,SiL)(H) are analyzed. None of the distortion isomers with cis-configuration has a trans-partner. The distortion isomers differ mostly by the degree of distortion in the Pt-L and L-Pt-L angles. Some of the isomers also differ by crystal packing. The total mean values of Pt-P (monodentate) and Pt-P (bidentate) bond distances are 2.279 Å and 2.244 Å, respectively. The mean value of Pt-P (monodentate) (trans to H¯) of 2.320 Å is the highest one because of higher trans-influence of H¯ over PP 3 . The total mean values of Pt-X (trans to P) elongate quite well with the covalent radius of the X in the sequence: 1.57 Å (X = H) &lt; 2.062 Å (O 2 L) &lt; 2.095 Å (OL) &lt; 2.108 Å (NL) &lt; 2.154 Å (N 2 L) &lt; 2.329 Å (Cl) &lt; 2.342 Å (S 2 L) &lt; 2.347 Å (SL) &lt; 2.480 Å (Br) &lt; 2.616 Å (I).

Distortion isomers of cis-PtP 2 X 2 and cis-PtP 2 XY derivatives – structural aspects