The synthesis and X-ray structure analysis of Os6(CO)17(NC5H5)2: a cluster compound with an unusual mode of metal–CO bonding

Abstract
Reaction of the neutral hexaosmium cluster Os6(CO)18 with excess of pyridine (py) gives the pentanuclear dianion [Os5(CO)15]2– together with small amounts of a neutral hexanuclear cluster Os6(CO)17(py)2(1); X-ray analysis shows that (1) exhibits an unusual type of metal–carbonyl linkage.

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