High nuclearity clusters containing methyl groups. Synthesis and structures of pentaosmium-gold carbonyl cluster compounds

摘要: Abstract The compounds Os5(CO)15(μ3-AuPPh3)2, 2 and Os5(CO)14[μ4-Au3(PPh3)3](μ3-AuPPh3), 3 were obtained from the reaction of [PPN]2[Os5(CO)15] using [Au(PPh3)][NO3]. Compound contains two triply-bridging Au(PPh3) groups. one group a quadruply-bridging Au3(PPh3)3 group. When same was performed in presence CH3Au(PPh3), new trigold compound Os5(CO)14(CH3)(μ3-AuPPh3)3, 4 obtained. three groups methyl coordinated to apical osmium atoms trigonal bipyramidal pentaosmium cluster. not by direct with CH3Au(PPh3) but it when [Au(PPh3)][NO3] added solutions. Cationic digold species such as [CH3Au2(PPh3)2]+ have been proposed possible mechanism for activation also albeit lower yield Os6(CO)18 MeAu(PPh3) following treatment Me3NO. Each products characterized structurally single-crystal X-ray diffraction analysis.