Metal alkoxides chemistry

Schubert, U., Hiising, N. and Lorenz, A. (1995) Hybrid inorganic-organic materials by sol-gel processing of organofunctional metal alkoxides. Chemistry of Materials, 7, 2010-2027. 

The chemistry of transition metals differs from those systems previously discussed, and only a few transition metals exhibit metal-alkoxide chemistry amenable to sol-gel synthesis. Cerda and coworkers prepared BaSnOs [74] by calcining a gel formed between Ba(OH)2 and K2Sn03 at pH 11. The material possessed a particle size of 200-500 nm and contained BaCOs as an impurity, which can be eliminated by high temperature calcination. O Brien and coworkers [75] synthe-... 

This brief introduction depicts four phases in the development of metal alkoxide chemistry. 

Hexamers (239, 240) and tetramers (34, 238) are common in alkali metal alkoxide chemistry, although with more sterically demanding alkoxo groups, the oligomeric nature becomes lower in the solid state (cf. Section IV.B). Interestingly, [NaO-/-Bu] , crystallizes as two independent molecules in the asymmetric unit as a hexamer (n = 6) and a nonamer (n = 9). 

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