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Title: Synthesis, X-ray structural and spectroscopic study of new silyl-substituted triosmium clusters
Authors: Ang, H.G. 
Chang, B.
Kwik, W.L. 
Sim, E.S.H.
Keywords: Osmium
X-ray diffraction
Issue Date: 12-Jul-1994
Citation: Ang, H.G.,Chang, B.,Kwik, W.L.,Sim, E.S.H. (1994-07-12). Synthesis, X-ray structural and spectroscopic study of new silyl-substituted triosmium clusters. Journal of Organometallic Chemistry 474 (1-2) : 153-163. ScholarBank@NUS Repository.
Abstract: The 2-pyridyldimethylsilane, 2-(CH3)2SiHC5H4NLH reacts with Os3(μ-H)2(CO)10] to afford the novel cluster [Os3(μ-H)2(CO)10 L2] 1 in which each of the ligands L has been shown from single crystal X-ray diffraction study to bond to one osmium atom through the silicon atom only. In addition, several silyl-substituted triosmium clusters of general formula [Os3(μ-H)(CO)11{2BrC 6H4CH2Si(CH3)2nHn}] (n = 0, 2A, 1, 2B; 2, 2C), Os 3(μ-H)CO)10(CH3 CN){2-BrC6H4CH2Si(CH3)2-nHn}] (n = 0, 3A; 1, 3B) have been synthesized from the reactions of the silane derivatives BrC6H4CH2Si(CH3)3-mHm [m = 1, I; 2, II; 3, III] with the activated clusters [Os3(CO)11CH3CN] and Os3(CO)10(CH3CN)2], respectively. The acetonitrile molecule in 3A is readily substituted by a triphenylphosphine molecule to yield Os3(μ-H)(CO)10(Ph3P){2-BrC6H4CH2Si(CH3)2})] (4). Reaction of [Os3(μ-H) 2(CO)10] with 2-BrC6H4Si(CH3)2H affords the cluster [Os3(μ-H)3(CO)9{2-BrC6 H4CH2Si(CH3)2}] (5). In the case of 3A the silane moiety bonds to an osmium atom at a position equatorial to the OS3 triangle while the acetonitrile molecule takes up an axial position. The molecular structure of 4 contains both the silane and the triphenylphosphine moieties at the terminal, equatorial positions on two separate osmium atoms. The behaviour under high performance liquid chromatography of these clusters has been determined and correlated with the nature of the ligands and with the molecular weights and sizes of the clusters. © 1994.
Source Title: Journal of Organometallic Chemistry
ISSN: 0022328X
Appears in Collections:Staff Publications

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