Formation of organically surface-modified metal oxo clusters from carboxylic acids and metal alkoxides: a mechanistic study

被引：38

作者：

Kickelbick, G

Feth, MP

Bertagnolli, H

Puchberger, M

Holzinger, D

Gross, S

机构：

[1] Tech Univ Vienna, Inst Mat Chem, A-1060 Vienna, Austria

[2] Univ Stuttgart, Inst Phys Chem, D-70550 Stuttgart, Germany

来源：

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2002年 / 20期

关键词：

D O I：

10.1039/b207994a

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reaction of Zr(OR)(4)(OR = (OBu)-Bu-n, (OPr)-Pr-n) with methacrylic acid was monitored by extended X-ray absorption ne structure (EXAFS), H-1 and C-13 NMR, HPLC, and Raman measurements. The study revealed that the initial dimeric zirconium alkoxides react rapidly with the carboxylic acid and form higher aggregated multinuclear compounds. EXAFS investigations showed that the structures of the resulting aggregates in solution depend on the carboxylic acid to alkoxide ratio. In addition, the reaction rates also differ depending on this ratio; while for a methacrylic acid to zirconium alkoxide ratio of 4: 1 the reaction is slow, metal oxo clusters form rapidly with a 7: 1 ratio. Methacrylic acid ester is simultaneously formed during the reaction, with concomitant production of water, required for the formation and condensation reactions in the cluster preparation.

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页码：3892 / 3898

页数：7

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