Heterotridentate organodiphosphines in Pt(η3-P1X1P2)(Y) derivatives-structural aspects

This review covers over 30 examples of monomeric Pt(II) complexes of the types: Pt(eta(3)-(POP2)-O-1-P-1)(Y) (Y = PL, CL, OL), Pt(eta(3)-(PNP2)-N-1-P-1)(Y) (Y = H, NL, CL, Cl, PL) and Pt(eta(3)-(PPN1)-P-1-N-2)(Y) (Y = Cl). The heterotridentate donor ligands create 11 types of a couple chelate rings with common central atom O-1 (eta(3)-(POP2)-O-1-P-1), N-1 (eta(3)-(PNP2)-N-1-P-1) and P-2 (eta(3)-(PPN1)-P-1-N-2). The most frequent is (PC2NC2P2)-C-1-C-1. Some cooperative effects between chelate rings and Y donor ligands were found and discussed. A degree of distortions of square-planar geometry about Pt(II) were also calculated.