A solution chemistry study of nonhydrolytic sol-gel routes to titania

被引：147

作者：

Arnal, P ^{[1
]}

Corriu, RJP ^{[1
]}

Leclercq, D ^{[1
]}

Mutin, PH ^{[1
]}

Vioux, A ^{[1
]}

机构：

[1] UNIV MONTPELLIER 2,LAB PRECURSEURS ORGANOMET MAT,F-34095 MONTPELLIER 5,FRANCE

来源：

CHEMISTRY OF MATERIALS | 1997年 / 9卷 / 03期

关键词：

D O I：

10.1021/cm960337t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The etherolysis/condensation of TiCl4 by diisopropyl ether ((Pr2O)-Pr-i) as well as the direct condensation between TiCl4 and Ti((OPr)-Pr-i)(4) are efficient nonhydrolytic sol-gel routes to titania. A comparison of the solution chemistry of the two routes was performed by means of NMR spectroscopy. In both cases the condensation is slow at room temperature; the true precursors are titanium chloroisopropoxides in equilibrium through fast ligand-exchange reactions. The condensation, takes place at 100 degrees C after an induction period which drastically depends upon the (OPr)-Pr-i/Ti ratio in the reaction mixture. This behavior is related to the composition of the starting chloroisopropoxides mixture. The key species in the induction process appears to be Ti((OPr)-Pr-i)Cl-3, which catalyzes the first condensation reactions.

引用

页码：694 / 698

页数：5

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