Photocatalytic reduction of Ag2SO4 by the Dawson anion α-[P2W18O62]6- and tetracobalt sandwich complexes

被引：39

作者：

Costa-Coquelard, Claire ^{[1
]}

Schaming, Delphine ^{[1
]}

Lampre, Isabelle ^{[1
]}

Ruhlmann, Laurent ^{[1
]}

机构：

[1] Univ Paris 11, UMR CNRS 8000, Chim Phys Lab, Fac Sci Orsay, F-91405 Orsay, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2008年 / 84卷 / 3-4期

关键词：

Dawson; Polyoxometalates; Photocatalysis; Silver;

D O I：

10.1016/j.apcatb.2008.06.018

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 photocatalytic behaviours of the Dawson salt alpha-K-6[P2W18O62] and two isomers of the tetracobalt Dawson-derived sandwich complexes, of alpha beta beta alpha-Na-17[Co-4(H2O)(OH)(P2W15O56)(2)]center dot 51H(2)O center dot 2NaCl and alpha alpha beta alpha- Na-16[Co-4(H2O)(2)(P2W15O56)(2)]center dot 51H(2)O (abbreviated beta beta-{Co4P4W30} and alpha beta-{Co4P4W30}, respectively), are described and compared. The direct photochemical excitation of the polyoxometalates (POM) in the presence of propan-2-ol as electron donor leads to their reduction. With polyoxometalates as photocatalyst and propan-2-ol as sacrificial electron donor, the reduction of (Ag2SO4)-S-1 from aqueous solutions is observed leading to metallic Ag-n(0) clusters and colloidal metal nanoparticles stabilized by POM. In the case of both {Co4P4W30}, TEM experiments reveal that most of the Ag-n particles obtained with a slight excess of Ag+ are spherical with a quite large distribution in size between 10 and 100 nm. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：835 / 842

页数：8

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