On the possibility of a carbenium ion structure for the complexes [Os3H3(CO)9CCR2]+. Further application of the 187Os nucleus |
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Authors: | AA Koridze OA Kizas NE Kolobova PV Petrovskii EI Fedin |
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Institution: | A.N. Nesmeyanov Institute of Organo-Element Compounds, Academy of Sciences, Vavilov Street 28, Moscow U.S.S.R. |
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Abstract: | In the 1H NMR spectrum of the complex Os3H3(CO)9CH2]+ at 30°C, under conditions of rapid exchange, the single hydride resonance has two sets of satellites of equal intensity (separated by 32.0 and 28.8 Hz) caused by 187Os1H spin—spin coupling. The spectral data rule out the upright carbenium ion structure for the complex, and are consistent with the fluxional process involving hydrocarbon ligand rotation about the CH2 axis in a tilted structure, with concomitant rotation of the Os3H3(CO)9 moiety. |
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