1. Organosilsesquioxane−Titanium Oxide Hybrids by Nonhydrolytic Sol−Gel Processes. Study of the Rearrangement of Si−O−Ti Bonds
- Author
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André Vioux, and P. Hubert Mutin, Dominique Leclercq, and Laurence Crouzet
- Subjects
Titanium chloride ,chemistry.chemical_compound ,Chemistry ,General Chemical Engineering ,Polymer chemistry ,Alkoxide ,Inorganic chemistry ,Materials Chemistry ,Oxide ,Redistribution (chemistry) ,General Chemistry ,Sol-gel ,Titanium oxide - Abstract
Organosilsesquioxane−titanium oxide hybrids were prepared by nonhydrolytic condensation between CH3SiX3 and 3/4TiY4 (with X = Cl, Y = OiPr or X = OR, Y = Cl). The two routes led to hybrids in quantitative yield without formation of Si−O−Ti bonds. The lack of Si−O−Ti bonds may be due to greater rates of homocondensation of the mixture of methylchloroalkoxysilanes and titanium chloride alkoxide initially formed by redistribution reactions and/or to the instability of the Si−O−Ti bonds, which underwent redistribution reactions to form Si−O−Si and Ti−O−Ti bonds. The intermediate formation of Si−O−Ti bonds by redistribution was indirectly evidenced in solution. The heterogeneity of the hybrids has been related mainly to this instability.
- Published
- 2003
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