Abstract
A novel binuclear cobalt complex with mixed valence state Co(Ⅰ)Co(Ⅱ)(μ-Ph_2Ppy)_2(μ-CO)_2Cl_3 has been prepared, Ph_2Ppy=2-(diphenyl phosphino)pyridine, and its molecular structure determined by using 3569 independent reflections. The complex was crystallized in the orthorhomblc space group P2_1nb with a=13.32(1), b=14.31(1),c=18.94(2) and Z=4. The structure was solved by direct method and full-matrix least squares refinement carried out. The final R value is 0.072.If the Co-Co bond is not taken into account, two cobalt atoms exhibit a five-coordlnate reformed trigonal bipyramid configuration (formal oxidation state +1) and a six-coordinate reformed octahedral configuration (formal oxidation state +2), respectively. The Co-Co distance is 2.685(1). The molecule belongs to the C_(2v), point group. A new W-frame compound with mixed valence state Co(0)Co(Ⅰ)(μ-Ph_2Ppy)_2(μ-CO)(CO)Cl can be formed by reducing this complex.
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