Novel heterotrinuclear, PtAg2, and hexanuclear, Pt2Ag4, compounds containing bridging alkynyl groups. Crystal structure of [Pt2Ag4(C6F5)4(µ3-η2-C
CPh)4(PPh3)2]·0.5CH2Cl2
Abstract
Treatment of the polymeric derivatives [{PtAg2(C6F5)2(CCR)2}n](R = Ph or But) with 2 molar equivalents of neutral ligands L (Ag:L 1:1) afforded the new more soluble trinuclear mixed-ligand complexes [PtAg2(C6F5)2(C
CR)2L2]1–8(L = PPh3, PEt3, CNBut or C5H5N). Analogous reactions with 1 molar equivalent of L (Ag:L 2:1) produced, however, only a partial depolymerization of [{PtAg2(C6F5)2(C
CR)2}n] to give the hexanuclear complexes [Pt2Ag4(C6F5)4(C
CR)4L2]9–16. Compounds 9–12 have also been obtained by treatment of the binuclear derivatives [NBu4][Pt(C6F5)2(µ-C
CR)2AgL] with AgClO4(1:1 molar ratio) in acetone. Similar reactions of [{PtAg2(C6F5)2(C
CR)2}n] with 1 or 0.5 equivalent of 1,2-bis(diphenylphosphino)ethane (dppe) yielded insoluble complexes of composition [{PtAg2(C6F5)2(C
CR)2(dppe)}n]17, 18 or [{Pt2Ag4(C6F5)4(C
CR)4(dppe)}n]19, 20 which are thought to be polymeric. The crystal structure of [Pt2Ag4(C6F5)4(µ3-η2-C
CPh)4(PPh3)2]·0.5CH2Cl29·0.5CH2Cl2 has been determined by X-ray diffraction methods.