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Tailored Molecular Precursors of Yttrium Oxide Using Functional Alcohols and Acetylacetone as Modifiers

Published online by Cambridge University Press:  28 February 2011

Liliane G. Hubert-Pfalzgraf ,
Olivier Poncelet  and
Jean-Claude Daran
Liliane G. Hubert-Pfalzgraf
Affiliation:
Laboratoire de Chimie Moléculaire, Associé au CNRS, Université de Nice-Sophia Antipolis, Parc Valrose, 06034 Nice, France
Olivier Poncelet
Affiliation:
Laboratoire de Chimie Moléculaire, Associé au CNRS, Université de Nice-Sophia Antipolis, Parc Valrose, 06034 Nice, France
Jean-Claude Daran
Affiliation:
Laboratoire de Chimie des Métaux de Transition, Place Jussieu, 75230 Paris, France
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Abstract

Yttrium is involved as oxide in a variety of advanced materials. Hydrolysis of its most common alkoxide, yttrium oxoisopropoxide Y5O(OiPr)13 , is difficult to control as a result of the high electropositivity of the metal. Functional alcohols such as 2-methoxyethanol and acetylacetone have thus been used as modifiers. These tailored precursors have been fully characterized (single crystal X-Ray diffraction, IR, NMR. ). The tendency of methoxyethanol to act as a bridging ligand and to stabilize high oligomers - Y(OC2H4OMe)3 is a decamer - gives some insight into its behavior as “network builder”. The unexpected cleavage of acetylacetone offers a route to an interesting acetatoacetylacetonate derivative, Y2(OAc)2(acac)4(H2O)2 , but also suggest that this classical “modifier” could be affected by the hydrolysis-polycondensation reactions of the metallic species during the sol-gel process. Comparison of the hydrolysis behavior of the different precursors was performed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 73
Copyright
Copyright © Materials Research Society 1990

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References

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