Tetrakis[(triphenylphosphine)gold(I)](tricyclohexylphosphine)boronium tetrafluoroborate, a novel boron-centred gold cluster

Abstract

Treatment of tricyclohexylphosphine(trimethylsilyl)borane with tris[(triphenylphosphine)gold(l)]oxonium tetrafluoro-borate [in tetrahydrofuran (thf) at –78 °C] affords moderate yields of the title compound [(Cy3P)B(AuPPh3)4]+ BF4-, the cation of which features pentacoordinate boron atoms in the centre of a (pseudo) square pyramid with the Cy 3P ligand in the apical position (Cy = cyclohexyl).