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Hydrolysis and Condensation of Modified TIN (IV) Alkoxide Compounds to form Controlled Porosity Materials

  • Christophe Roger (a1), M. J. Hampden Smith (a1) and C. J. Brinker (a2)

Abstract

Sol-gel type hydrolysis and condensation has been studied extensively as a method for the control of evolution of microstructure in the formation of inorganic silicates. However, in non silicate systems, the same level of control of microstructural evolution has yet to be demonstrated. In this work, we report the synthesis of mixed ligand tin (IV) alkoxide complexes specifically designed to undergo sequential hydrolysis reactions, where, as a result, control over porosity of the final metal oxide network is expected. A series of tin (IV) alkoxide compounds modified with difunctional carboxylate ligands as templates has been prepared with internuclear tin separations that are determined by the length of the bridging carboxylate group. The first hydrolysis step consists of the removal of the alkoxide ligands to create a three-dimensional network of oxo-bridged tin carboxylate species. In the second step, the bridging groups are removed by acid hydrolysis to leave pores without creating new Sn-O-Sn bonds. The synthesis and characterization of these species and the connection between pore structure (i.e. micro- vs. meso- porosity) as a function of the dimensions of the bridging ligands will be reported.

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Hydrolysis and Condensation of Modified TIN (IV) Alkoxide Compounds to form Controlled Porosity Materials

  • Christophe Roger (a1), M. J. Hampden Smith (a1) and C. J. Brinker (a2)

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