Abstract
The tripod ligand tris(o-diphenylphosphinophenyl)-phosphine, P(C 6H 4PPh 2) 3, QP, forms with cobalt(II) salts in presence of borohydride a series of five-coordinate cobalt(I) complexes of general formula [CoX(QP)], where X = Cl, Br, I, NCS, H. The hydride complex [CoH(QP)] has been studied by X-ray analysis, using diffractometer data. The crystals are orthorhombic, space group, Pbca, with the following cell constants: a = 17.040(4), b = 22.312(6), c = 22.581(6) Å, d m = 1.37 gcm −3, Z = d c = 1.361 gcm −3. The structure has been solved by three-dimensional Patterson and Fourier syntheses and refined by least-squares techniques to a final R w factor of 0.048 and R factor of 0.068 for the 1203 observed reflections. The structure consists of discrete trigonal bipyramidal [CoH(QP)] molecules.
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