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29 July 1997 Toward molecular design of oxide precursor for advanced materials
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Chemical routes to materials rely on the availability of appropriate precursors. The high lability of the metal alkoxide linkage opens up large possibilities of tailoring of solubility, hydrolysis rates, introduction of special functionalities such as polymerizable ones into the coordination sphere and thus into the final network. The coordination modes of common chemical modifiers are discussed. Differences between silicon and electrophilic metals are stressed.

Simple ways to build up mixed-metal molecules which can act as potential single-source precursors to multimetallic oxides are reviewed. Emphasis is given to Lewis acid-base reactions between metal alkoxides M(OR)n, and between metal alkoxides and more accessible oxide precursors, namely carboxylates M(O2CR)n and β- diketonates M(β-dik)n. The reactions proceed toward the formation of aggregates in which the different metals display their usual coordinations numbers, often six for transition metals, as shown single crystal X-ray diffraction. Strategies for fixing the stoichiometry between the metals are developed. The reactivity of the MM'species (dissociation, effects of chemical modifiers, of other metallic species, hydrolytic or nonhydrolytic condensation,...) will be indicated.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Liliane G. Hubert-Pfalzgraf "Toward molecular design of oxide precursor for advanced materials", Proc. SPIE 10290, Sol-Gel and Polymer Photonic Devices: A Critical Review, 1029002 (29 July 1997);

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