Tris(trimethylphosphine)cobalt(I) Halides. Preparation and Properties

H. F. Klein, H. Karsch

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Abstract

Syntheses and properties of stable cobalt(I) halides of the formula COXL3 (L = (CH3)3P; X = Cl, Br, I) are reported. In solution these compounds add carbon monoxide under normal pressure to form pentacoordinate complexes of the composition CoX(CO)L3 which, in a subsequent step, are converted into dicarbonyl compounds CoX(CO)2L2. By addition of a phosphine ligand ionic species [Co(CO)L4]+X- are formed. In the absence of CO the first tetrahedral cobalt(I) cation is isolated in the form [COL4]+[B(C6H5)4]-. An even higher coordination number is accessible in the presence of dimethylphosphine in the form of [CoL4L′]+X- (L = (CH3)3P; L′ = (CH3)2PH; X = Cl, Br). This pentacoordinate species is not formed with trimethylphosphine alone. Infrared, nmr, and magnetic measurements suggest probable structures of these complexes in solution.

Original languageEnglish
Pages (from-to)473-477
Number of pages5
JournalInorganic Chemistry
Volume14
Issue number3
DOIs
StatePublished - 1 Mar 1975
Externally publishedYes

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