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 language | English |
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Pages (from-to) | 473-477 |
Number of pages | 5 |
Journal | Inorganic Chemistry |
Volume | 14 |
Issue number | 3 |
DOIs | |
State | Published - 1 Mar 1975 |
Externally published | Yes |