LAUSR

This review covers over fifty Pt(II) monomeric complexes with a wide combination of η3-ligands of the composition Pt(η3-X3L)(PL), (X3 = N3; S3; Te3; ONO; CNC, SeNSe; ONC; ONS; CNS; NNC, NNS; NNSe, SOS; SBS; NON; SSO). The η3-ligand with monodentate PL displays distorted square-planar geometry about Pt(II) atoms. The structural parameters (Pt-L, L-Pt-L) are analyzed and discussed, with a particular emphasis on the distortion of square-planar geometry about Pt(II) atoms, as well as of the trans-influence. There is a relation between the membered nature of the metallocycles and the distortion of square-planar geometry about the Pt(II) atoms. The distortion increases as indicated by parameter τ4 in the following order: 0.023 (6+6) < 0.024 (^+5) < 0.040 (5+6) < 0.062 (5+5).