Abstract
The X-ray structure determination of tetraphenylphosphonium trans-aquatetrabromo(carbonyl)osmate(III), trans-[(C6H5)4P][OsBr4(CO)(H2O)], at 293 K has revealed a slightly distorted octahedral coordination of the osmium(III) atom, with H2O trans to the almost linear carbonyl group. The distances are 1.795 (10) for Os—C, 2.181 (6) for Os—Ow, and 1.164 (9) Å for C—O; among the Os—Br bond lengths two are shorter, 2.4692 (8) and 2.4753 (10), and two are longer, 2.5042 (8) and 2.5072 (8) Å. Centrosymmetric dimers of the complex anions are formed by intermolecular hydrogen bonding between the coordinated water molecule and the two Br ligands that form longer bonds to the central atom.
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