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Hydrolysis and Condensation of Tin(IV) Alkoxide Compounds: The Control of Structural Evolution.
Final rept. 15 Apr 93-14 Apr 96,
NEW MEXICO UNIV ALBUQUERQUE DEPT OF CHEMISTRY
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We have studied ester elimination in a number of model systems to determine the criteria which promote or inhibit such reactions. The model systems generally involve metal centers which possess NMR active nuclei such as 29Si, 119, 117Sn and 207Pb. In these systems, we have conducted a number of 170 labeling experiments which reveal that ester elimination is probably an associative process that requires electropositive metal alkoxide centers, accessible coordination sites at the metal centers, dangling carboxylate ligands and which is promoted by non- coordinating solvents and inhibited by coordinating solvents. In a heterobimetallic systems, the reaction between SnO-t-Bu4 and PbOAc4 results in formation of a metal oxo cluster in the presence of toluene. These metal oxo clusters retain their structure in solution as determined by multinuclear NMR spectroscopy for PbSn2OO-t-Bu4OAc4. As a result of this understanding gained from these model reactions, we are now in a position to investigate the formation of metal oxide materials using these clusters.
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