Abstract

Abstract Molybdenum(V) and (VI) and tungsten (VI) complexes of formulae MoOX3.RPPh, MO2X2.RPPh and MoO2X2.RPOEt, where RPPh = bis[(diphenylphosphinyl)methyl]phenylphosphine oxide and RPOEt = bis[(diphenylphosphinyl)methyl]ethyl phosphinate, M = Mo or W and X = Cl, Br or I, have been isolated. Molar conductance, magnetic susceptibility, IR, electronic, 1H and 31P NMR measurements are discussed. All the complexes isolated have octahedral geometry in which the potentially terdentate ligands are coordinated to the metal through two P=O groups.

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