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- W140977416 abstract "The first part of the thesis describes the use of nuclear Overhauser enhancement (NOE) to determine the relative positions of two or more hydrides that are chemically different in osmium clusters. Eight types of clusters with various, known arrangements of chemically inequivalent hydrides were studied. The observed enhancements were in good agreement with the predicted results. The relaxation time, TI, for the hydrides in some of these clusters were also measured. It was found that terminal hydrides have the shortest T1 values and those for the bridging hydrides depend on the identity of the neighbouring groups. Both the NOE and T1 measurements provide valuable information on the location of hydride ligands in metal clusters. This is often difficult to determine by X-ray crystallographic and conventional spectroscopic techniques. The second part of the thesis describes investigations of the stereochemical nonrigidity in various trinuclear and tetranuclear osmium clusters by variable temperature 13c NMR spectroscopy. In the 1% NMR spectra of Os3(CO)ll(L) (L = group 15 ligand; L in an equatorial site) sets of carbonyl signals collapse at different rates between -50 C and 60 'C. T h e results are rationalized in terms of three" @default.
- W140977416 created "2016-06-24" @default.
- W140977416 creator A5040832147 @default.
- W140977416 date "1992-01-01" @default.
- W140977416 modified "2023-09-26" @default.
- W140977416 title "NMR studies of some osmium cluster compounds" @default.
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- W140977416 hasPublicationYear "1992" @default.
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