Reduction of the tetraosmium cluster [Os4H4(CO)12] with K-Ph2CO gave the cluster dianion [Os4H4(CO)11]2-1 in quantitative yield. This dianion was treated with [Ru(C6H6)(MeCN)3]2+to give [RuOs4H4(η6-C6H6)(CO)11] 2 in fair yield, while the corresponding reaction with [Os(C6H6)(MeCN)3]2+gave [Os5H4(η6-C6H6)(CO)11] 3 and [Os5H4(η6-C6H6)(CO)12] 4 in similar yields (ca. 25% each). Clusters 2-4 have been fully characterised by both spectroscopic and crystallographic methods. The crystal structures of 2 and 3 are isomorphous and both the molecules are isostrctural. Both contain a trigonal bipyramidal metal-core geometry with the η6-C6H6co-ordinated to the Ru or Os atom in an equatorial position. Cluster 4 contains an Os4tetrahedron with one Os-Os edge bridged by an 'Os(η6-C6H6)(CO)' unit. Complex 3 is not convertible into 4 under thermolytic and photolytic conditions in the presence of CO, or 4 into 3 in the absence of CO.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Dalton Transactions|
|Publication status||Published - 1 Dec 1993|
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