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Title: Phosphinobenzyl- and aryl-silanes and their triosmium cluster carbonyl derivatives
Authors: Ang, H.G. 
Chang, B.
Kwik, W.L. 
Issue Date: 1992
Citation: Ang, H.G., Chang, B., Kwik, W.L. (1992). Phosphinobenzyl- and aryl-silanes and their triosmium cluster carbonyl derivatives. Journal of the Chemical Society, Dalton Transactions (14) : 2161-2169. ScholarBank@NUS Repository.
Abstract: The Grignard reagents MgR(Br) (R = C6H4CH2SiMe2H-o or C6H4CH2SiMeH2-o) have been found to undergo unusual reactions with Ph2PCl to afford o-Ph2PC6H4CH2SiMe2H I and o-HMe2SiC6H4CH2PPh2 II and o-Ph2PC6H4CH2SiMeH2 III and o-H2MeSiC6H4PPh2 IV respectively. Reactions of the respective bidentate ligands I, II, III and IV with [Os3(CO)10(MeCN)2] gave the novel triosmium cluster [Os3(μ-H)(CO)10(L-L)] 1, 2, 3 and 4 involving cleavage of one Si-H bond. Similar reactions of ligands II and IV with [Os3(μ-H)2(CO)10] afforded two new clusters [Os3(μ-H)3(CO)8(L-L)] 5 and 6 respectively. The structures of 1, 2, 4 and 5 have been determined by single-crystal X-ray diffraction techniques. In each case, the ligand assumes a chelating mode across the long edge of the osmium triangle which is also bridged by a hydride. The high-performance liquid chromatographic behaviour of these clusters has also been determined and correlated with the size and nature of the ligands.
Source Title: Journal of the Chemical Society, Dalton Transactions
ISSN: 14727773
DOI: 10.1039/DT9920002161
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