The influence of β-diketones on the induction times for hydrolysis of zirconium(IV) alkoxides

M J Percy; John R Bartlett; J L Woolfrey; L Spiccia; B O West

doi:10.1039/A806782A

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The influence of β-diketones on the induction times for hydrolysis of zirconium(IV) alkoxides

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The influence of β-diketones on the induction times for hydrolysis of zirconium(IV) alkoxides

M J Percy, John R Bartlett, J L Woolfrey, L Spiccia and B O West

Journal of Materials Chemistry, Vol.9(2), pp.499-505

1999

DOI: https://doi.org/10.1039/A806782A

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Abstract

Engineering

Chemical Sciences

The influence of low ligand/Zr mole ratios (p = 0-0.1) of acetylacetone on the hydrolysis of Zr(OPr(n))4 has been examined by investigating its effect on the induction time (t(i)) before precipitation commences in the system. A remarkable feature of the data is the large increase in the induction time (reduction in hydrolysis/condensation rate) caused by addition of acetylacetone. This occurs even though only a maximum of one in eighty Zr- OR bonds have reacted with ligand and are no longer available for hydrolysis or further condensation. The effects on t(i) of five other β-diketones having varying steric properties (trifluoroacetylacetone, hexafluoroacetylacetone, benzoylacetone, dibenzoylmethane and dipivaloylmethane) are compared with that of acetylacetone, under similar concentration conditions, with p-0.1. Each shows a greater effect than acetylacetone, the largest change being caused by dibenzoylmethane which, under the conditions used, increases the induction time by a factor of 26 relative to acetylacetone. A mechanism rationalising the origin of the effect is discussed.

Details

Title: The influence of β-diketones on the induction times for hydrolysis of zirconium(IV) alkoxides
Authors: M J Percy (Author) - Australian Nuclear Science and Technology Organisation Materials Department
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Department
J L Woolfrey (Author) - Australian Nuclear Science and Technology Organisation Materials Department
L Spiccia (Author) - Australian Nuclear Science and Technology Organisation Materials Department
B O West (Author) - Australian Nuclear Science and Technology Organisation Materials Department
Publication details: Journal of Materials Chemistry, Vol.9(2), pp.499-505
Publisher: Royal Society of Chemistry (R S C) Publications
Date published: 1999
DOI: 10.1039/A806782A
ISSN: 0959-9428
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99449961302621
Output Type: Journal article

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