Organophosphines in organoplatinum complexes: Structural aspects of PtP2CX (X = SL, SeL, SiL, TeL) derivatives

• Structure of PtP2CX (X = S, SE, Si, Te).
• Review of over 80 complexes.
• Attention to any trans- influence.
• Isomers.

This review summarized and analyzed structural parameters of almost eighty complexes with PtP2CX (X = S(x56), Se(x8), Si(x14), Te(x1) inner coordination spheres. These complexes crystallized in five crystal systems: hexagonal (1.3%), tetragonal (3.8%), orthorhombic (14.1%), triclinic (15.4%) and monoclinic (65.4%). The inner coordination spheres about Pt(II) atoms are create with wide variability of donor ligands: monodentate PL, CL, SL, SeL, SiL, TeL; homobidentate- P, P', heterobidentate- C, S; S, Se, C, Si; and heterotridentate- P, Si, P and P, P, Si donor sites. The chelating ligands form variable metallocyclic rings from three- to seven- membered. There are complexes with cis- configuration (74 examples) and with trans- configuration (5 examples). The sum of four Pt-L bond distances in cis- derivatives growing in the order: 9.02 Å (PtP2CS) < 9.12 Å (PtP2CSi) < 9.23 Å (PtP2CSe) and in trans- derivatives the values are 9.00 Å (PtP2CS), 9.07 Å (PtP2ClSi) and 9.33 Å (PtP2CTe). In complexes with cis- configuration the sums are higher than those in trans- configuration, the reasons are discussed. There are two types of isomerism: distortion and ligand.

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