An Outline of Geophysical-Chemical Problems (1920)(en)(10s) by Sosman R.B.

By Sosman R.B.

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28. , Chem. , I , 248 (1989). 29. , Chem. , 2,76 (1967). F. , 30. Day, V. ,andRosenberg, Chemical Processing ofAdvunced Materials (L. L. Hench, and J. K. ), Wiley, New York, 1992, p. 257. 31. R. Acad. Sci. , 307, 1747(1988). 32. Day, V. , Eberspacher, T. , Klemperer, W. , Park, C. , and Rosenberg, F. , J. Am. Chem. , 113, 8190 (1991). 33. Bradley, D. , Hurthouse, M. , and Rodesiler, P. , J. Chem. Soc. Chem. , 1112 (1968). 34. Graeber, E. J. , B33, 2136 (1977). 35. ,Caughlan,C. , andCampbell, J.

This has been shown, for instance, by metal N M R on niobium and titanium alkoxides. “Uncontrolled” alcohol interchange reactions may thus occur when a metal alkoxide is used in an alcohol different from the parent alcohol. Such reactions lead to a modification (decrease) of the apparent functionality of the precursors, which in turn can affect the properties (morphology, porosity, and so on) of the resulting oxide. Functional alcohols, such as alcoxyalcohols-mainly 2-methoxyethanol-or alkanolamines (diethanolamine and triethanolamine), are actuallythemost commonly used to slow hydrolysis rates and thus to “stabilize” metal alkoxides.

Mass spectrometry, for instance, established thatheterometallic LiNb fragments were retained in the gas phase for LiNb(OEt)6. Their structure is mainly determined by the overall nuclearity of the aggregate (MxMy and derives from the basic structural moiety in which the different metals display the usual coordination numbers expected for the bulk of the OR [4]. Numerous mixed-metal homoleptic alkoxides for which the stoichiometry betweenthetwo metals is 1: 1 have a structurethat derives from that of [Ti(OMe)4]4 (Fig.

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