Synthesis and crystal structures of dinuclear oxotungsten(VI) diolato complexes

Abstract

Dinuclear complexes [W₂O₃L₂(HL)₂][H₂L = 2,3-dimiethylbutane-2,3-diol (H₂pin), trans-cycloheptane-1,2-diol (H₂chpd) or trans-cyclooctane-1,2-diol (H₂cocd)] were prepared in high yield by hydrolysis of [W(eg)(pin)₂](H₂eg = ethane-1,2-diolate), [W(chpd)₃] and [W(cocd)₃] in alcoholic solution. X-Ray diffraction studies showed that each tungsten(VI) ion is bonded to one diolate, one hydrogendiolate, one terminal and one bridging oxide ligand. Two tungsten-centred units are also linked together by intramolecular O ⋯ H–O hydrogen bonds between the diolate and hydrogendiolate ligands. The geometry of the dinuclear unit is dependent on the nature of the diolate ligands.