Dalton communications. The synthesis of the first examples of water-soluble seven-co-ordinate complexes of tungsten(II)

Abstract

Reaction of the seven-co-ordinate complex [WI2(CO)3(NCMe)2] with two equivalents of 4-HO2CC5H4N in methanol at room temperature gave the bis(pyridine-4-carboxylic acid) complex [Wl2(CO)3(4-HO2CC5H4N)2]1 in good yield, which, upon treatment with two equivalents of NaOH in ethanol, afforded the completely water-soluble complex [Wl2(CO)3(4-NaO2CC5H4N)2]2 in good yield; reaction of the latter with an equimolar amount of 3-NaO3SC5H4N yielded [Wl2(CO)3(4-NaO2CC5H4N)(3-NaO3SC5H4N)], which represents the first room-temperature ligand-substitution reaction in water of a metal carbonyl complex.