Oxidation reactions of hydridotetrakis(diethoxyphenylphosphine)cobalt(II) hexafluorophosphate: preparation of cationic hydridocobalt(III) complexes.

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Abstract
The cobalt(II) hydride [CoH{PPh(OEt)2}4][PF6] is oxidised by [Fe(η-C5H5)2]+ in the presence of potential ligands L[MeCN, PhCN, ClCH2CN, or PPh(OEt)2] giving a series of cobalt(III) hydrides [CoH{PPh(OEt)2}4L]-[PF6]2, the first known cobalt complexes containing hydride or phosphorus ligands to carry a 2+ charge. Replacement of an aqua-ligand in an imperfectly characterised complex, possibly [CoH(OH2){PPh(OEt)2}4][PF6]2, by halide ions gives another series of CoIII complexes, [CoH{PPh(OEt)2}4X][PF6](X = Cl, Br, or I).