Planas, J.G., Teixidor, F., Vinas, C., Light, M.E. and Hursthouse, M.B. (2007) Self-assembly of halogenated cobaltacarborane compounds: Boron-assisted C-H center dot center dot center dot X-B hydrogen bonds? Chemistry - A European Journal, 13 (9), 2493-2502. (doi:10.1002/chem.200601297).
Abstract
Full structural characterisation and complete synthetic procedures for three monohalogenated cobaltacarborane compounds closo-[3-Co(5-C5H5)-8-X-1,2-C2B9H10] (X = Cl (1), Br (2), I (3)) and the dibromo derivative closo-[3-Co(5-C5H5)-8,9-Br2-1,2-C2B9H9] (4) are reported. The supramolecular structures of 1, 3, and 4 reveal the existence of intermolecular CHXB interactions. The role of these interactions has been investigated through a CSD search and subsequent analysis of the reported crystalline compounds. The results show that halogens become reasonably good hydrogen-bond acceptors when bonded to boron and, in this respect, are comparable in strength to metal-bound halogens.
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