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.
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