Organodiphosphines in cis-Pt(²-PX_nP)(Cl)₂ (n=1,2,3) derivatives: Structural aspects

This article covers almost 130 Pt(ii) complexes with an inner coordination sphere of cis-PtP2Cl2. The P-donor ligands are organodiphosphines that create four-, five-, and six-membered metallocyclic rings. There are two types of four-membered rings: PCP and PNCP, and four types of five-membered rings: PC-CP, PC & boxH;CP, PNNP, and PCOP. There are wide varieties of the six-membered metallocyclic rings: PC3P (most common), PCNCP, PCSCP, PCSiCP, PNCNP, PCCOP, PCCNP, POPNP, POSiOP, P(CNC)(2)P, and P(CNC)(CCC)P. The P-Pt-P bite angles open with the size of the metallocyclic rings in the order (total mean values 72.4 degrees [PXP] < 86.4 degrees [PXXP] < 94.0 degrees [PXXNP]). There are complexes that are examples of distortion and ligand isomerism. The structural data are analyzed and discussed.