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M. Czakler, U. Schubert:
"New Zirconium(iv) Oxo Clusters";
Poster: 14. Österreichische Chemietage, Johannes Kepler Universität, Linz; 2011-09-26 - 2011-09-29; in: "14. Österreichische Chemietage - Program", (2011), Paper ID PO-47, 1 pages.

The formation of defined compounds (clusters) from metal or semimetal alkoxides is achieved by controlled condensation and hydrolysis. For example zirconium oxo clusters with methacrylate ligand have been synthesized by adding an excess of methacrylic acid to zirconium n-propoxide. Water is formed in situ in the reaction solution by esterification of the methacrylic acid. Therefore the methacrylic acid is providing the stabilizing carboxylate ligands for the cluster and serves also as the source of water for the hydrolysis reaction.
Changing from methacrylic acid to other carboxylic acids, results in different zirconium oxo clusters, with several different types of cluster cores. The reaction conditions and the ratio of the used ligand to the zirconium alkoxides are important on the route to new zirconium oxo clusters.
The resulting clusters vary in the core, diversification in number of zirconium atoms and arrangement thereof, and in the ligand sphere. By using organofunctional ligands, zirconium oxo clusters can be used for fabrication of hybrid polymers or for metalorganic frameworks.

Project Head Ulrich Schubert:
Anisotrope Funktionalisierung von Clustern