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Modification of Metal Alkoxide Precursors by Organofunctional Bidentate Ligands: Chemical Problems and Opportunities for Materials Syntheses

Published online by Cambridge University Press:  01 February 2011

Ulrich Schubert ,
Ulrike Bauer ,
Helmut Fric ,
Michael Puchberger ,
Wolfgang Rupp  and
Viktoria Torma
Ulrich Schubert
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
Ulrike Bauer
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
Helmut Fric
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
Michael Puchberger
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
Wolfgang Rupp
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
Viktoria Torma
Affiliation:
Institute of Materials Chemistry, Vienna University of Technology Getreidemarkt 9/165, A-1060 Wien, Austria
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Abstract

Bidentate ligands are potentially useful to modify metal alkoxides precursors for sol-gel processing. However, anionic bidentate ligands are needed to get a strong coordination, while diamines as neutral bidentate ligand form coordination polymers [Ti2(OR)8(diamine)2]∞ when reacted with Ti(OR)4. The Lewis acidity of metal alkoxides may cause organic side reactions. The first is the formation of ester and water in the reaction with carboxylic acids, and therefore carboxylate-substituted metal oxide clusters of the general composition MnOx(OH/OR)y(OOCR)z are obtained instead of substituted monomeric precursors. The second side reaction discussed is the cleavage of β-diketones by metal alkoxides. Despite this side reaction, 3-acetyl-6-trimethoxy-silyl-hexane-2-one is a useful compound to prepare single-source precursos for silica/metal oxide composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE7.2
Copyright
Copyright © Materials Research Society 2005

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References

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