Reaction of nido-7,8-C2B9H13 with Dicobalt Octacarbonyl: Crystal Structures of the Complexes [Co2(CO)2(η5-7,8-C2B9H11)2], [Co2(CO)(PMe2Ph)(η5-7,8-C2B9H11)2], and [CoCl(PMe2Ph)2(η5-7,8-C2B9H11)]
| Autor: | J. C. Jeffery, Paul A. Jelliss, Eric L. Sappenfield, Donald F. Mullica, Hendershot Sl, Fga Stone |
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| Rok vydání: | 1996 |
| Předmět: | |
| Zdroj: | Inorganic Chemistry. 35:6561-6570 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic960560s |
| Popis: | The compounds [Co2(CO)8] and nido-7,8-C2B9H13 react in CH2Cl2 to give a complex mixture of products consisting primarily of two isomers of the dicobalt species [Co2(CO)2(η5-7,8-C2B9H11)2] (1), together with small amounts of a mononuclear cobalt compound [Co(CO)2(η5-10-CO-7,8-C2B9H10)] (5) and a charge-compensated carborane nido-9-CO-7,8-C2B9H11 (6). In solution, isomers 1a and 1b slowly equilibrate. However, column chromatography allows a clean separation of 1a from the mixture, and a single-crystal X-ray diffraction study revealed that each metal atom is ligated by a terminal CO molecule and in a pentahapto manner by a nido-C2B9H11 cage framework. The two Co(CO)(η5-7,8-C2B9H11) units are linked by a Co−Co bond [2.503(2) A], which is supported by two three-center two-electron B−H ⇀ Co bonds. The latter employ B−H vertices in each cage which lie in α-sites with respect to the carbons in the CCBBB rings bonded to cobalt. Addition of PMe2Ph to a CH2Cl2 solution of a mixture of the isomers 1, enriched in 1b, ... |
| Databáze: | OpenAIRE |
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