Synthesis and X-ray characterization of the new pentanickel cluster cation [Ni_5(#mu#_5-S)(#mu_3-S)_2(#mu#_2-S)(#mu#-CH_3COO)(PPh_3)_5]~+

摘要

By reacting Ni(CH_3COO)_2 centre dot 6H_2O with H_2S in the presence of PPh_3,the new Ni/S cluster of formula [Ni_5(#mu#_5-S)(#mu#_3-S)_2(#mu#_2S)(#mu#-CH_3COO)(PPh_3)_5]PF_6centre dot C_7H_8centre dot 0.5CH_2Cl_2 has been isolated and characterized by X-ray diffraction analysis. Crystal data: space group P2_1/c,a = 15.774 (4),b = 21.235 (7),c = 29.288(7) A,#beta# = 95.66(4)deg. The inner core consists of a square pyramid of five nickel atoms,linked together by a bridging acetate and four variously bridging sulfur ligands. The ~(31)P {~1H} NMR spectra in dichloromethane solution are consistent with the abovve geometry.