A 1 2 ADDUCT OF TRAKIS(MU-THIOBENZOATO-O,S)DIMOLYBDENUM(II)(MO-MO) WITH TRIPHENYLPHOSPHINE OXIDE, [MO-2(C7H5OS)(4)].2[(C6H5)(3)OP]/

The reaction of trakis(mu-thiobenzoato-O,S)dimolybdenum(II)(Mo-Mo) and triphenylphosphine oxide in a 1:2 stoichiometric ratio yields the tit le adduct. The dinuclear complex molecule, which has a quadruple Mo=Mo bond bridged by four thiobenzoato ligands, is located on a centre of symmetry. This is the first structural example in which two quadruply bonded Mo atoms [2.152(1)Angstrom] are coordinated by both O and S don or atoms, as well as being the first adduct of an Mo=Mo species with t wo axially bonded triphenylphosphine oxide molecules. The Mo-O(Ph(3)PO ) bond is relatively weak, judging by its length of 2.492(3)Angstrom.