Multinuclear Nuclear Magnetic Resonance Studies of Model Inorganic Systems (Nmr)

133 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1987.A variety of techniques are employed to obtain information from molybdenum carbonyl on (gamma)-aluminum, the Group IIIA compounds, Al III and silica hydrolysis. Techniques such as rapid magic-angle sample spinning (MASS) of glass sealed samples are used to investigate the highly air sensitive system molybdenum carbonyl on (gamma)-alumina by carbon-13 NMR spectroscopy. The results obtained suggest the presence of very mobile physisorbed molybdenum hexacarbonyl. The two subcarbonyls molybdenum penta-carbonyl and tri-carbonyl are shown to be the most consistent with the data as products after thermal activation.Solid-state scandium-45, yttrium-89 and lanthanum-139 NMR spectra are obtained of a number of model compounds. The results obtained demonstrate the feasibility of obtaining a variety of NMR parameters for this group of compounds.Oxygen-17 NMR is extensively employed in both the solid-state and in solution to better understand Al III and silica hydrolysis. The kinetic information possible with oxygen-17 labeling shows that once the tetrahedral core of the Al(,13) cluster is formed these tetrahedral oxygens do not exchange with any others in aqueous solution. These different exchange rates allow selective enrichment in solid materials which enhance the interpretation of the solid-state oxygen-17 NMR data.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD