The crystal and molecular structure of tetraphenylarsonium Tetrakis(benzenethiolato)oxomolybdate(V)

Abstract

Crystals of the title compound, Ph₄As⁺ [MoO(SPh)₄]^-, belong to the triclinic space group Pī with cell dimensions a 12.623(8), b 14.295(7), c 14.301(9) Ǻ, α 94.43(4), β 111.43(5), γ 65.70(4)° and Z2. The structure has been refined with diffractometer data measured with Mo Kα radiation to give a conventional R factor of 0.056 for 3215 unique terms. The Mo, As, S and O atoms were refined with anisotropic temperature factors and the C atoms with isotropic factors. The square- pyrimidal [MoO(SPh)₄]^- anion has the Mo atom lying 0.82 Ǻ from the basal plane of the four S atoms with Mo-O 1.699(9) Ǻ, the mean Mo-S bond lengths 2.403(5) Ǻ and the mean S...S distance 3.20(3) Ǻ. The geometry about the As atom in the Ph₄As⁺ cation is regular tetrahedral, the mean As-C bond length being 1.91(1) Ǻ.