Redox properties of hybrid Dawson type polyoxometalates disubstituted with organo-silyl or organo-phosphoryl moieties

被引：20

作者：

Boujtita, Mohammed ^{[3
]}

Boixel, Julien ^{[2
]}

Blart, Errol ^{[2
]}

Mayer, Cedric R. ^{[1
]}

Odobelc, Fabrice ^{[2
]}

机构：

[1] Univ Versailles St Quentin, Inst Lavoisier Versailles, CNRS, UMR 8180, F-78035 Versailles, France

[2] Univ Nantes, Nantes Atlantique Univ, CNRS, Fac Sci & Tech,LSO,UMR 6513, F-44322 Nantes 3, France

[3] Univ Nantes, Nantes Atlantique Univ, CNRS, Fac Sci & Tech,LAIEM,UMR 6006, F-44322 Nantes 3, France

来源：

POLYHEDRON | 2008年 / 27卷 / 02期

关键词：

Dawson-type polyoxometalate; functionalization; phosphoryl; silyl; electrochemical study; spectroelectrochemistry;

D O I：

10.1016/j.poly.2007.10.022

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

This paper reports on the electrochemical study of Dawson-type polyoxometalates (POMs) disubstituted with phenyl-phosphonate, phenyl silyl or tertbutylsilyl moieties. The polyanions were studied by cyclic voltammetry and on rotating disk electrode in acetonitrile with tetraphenylphosphonium chloride as supporting electrolyte. We found that these hybrid polyoxometalates can accept up to five electrons and that the organic substituents modify the first and second reduction potential of the POM compared to the unsubstituted POM [P2W18O62](6-). Phenyl-phosphonate lowers the reduction potential, whereas the phenyl silyl or tertbutylsilyl moieties shift them cathodically. We also recorded by spectroelectrochemistry the spectrum of the monoreduced and the bisreduced species of the polyoxometalate disubstituted with phenyl-phosphonate. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：688 / 692

页数：5

共 33 条

[1] Synthesis, characterization and study of the chromogenic properties of the hybrid polyoxometalates [PW11O39(SiR)2O]3-(R = Et, (CH2)nCH=CH2 (n = 0, 1, 4), CH2CH2SiEt3, CH2CH2SiMe2Ph) [J].