Polymer-protected bimetallic clusters with various alloying structures

被引：19

作者：

Toshima, N

机构：

[1] Department of Applied Chemistry, School of Engineering, University of Tokyo, Hongo, Bunkyo-ku

来源：

MACROMOLECULAR SYMPOSIA | 1996年 / 105卷

关键词：

D O I：

10.1002/masy.19961050115

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Colloidal dispersions of polymer-protected bimetallic cluster can be prepared by refluxing the alcoholic solutions of two kinds of metal ions in the presence of poly(N-vinyl-2-pyrrolidone). The bimetallic clusters thus prepared had higher activity as catalysts than the corresponding monometallic clusters. The structure of bimetallic clusters, analyzed by an Extended X-ray Absorption Fine Structure(EXAFS) technique as well as ultraviolet-visible(Uv-vis) absorption spectra, depends on the preparation method. Some of them have a special core-shell structure. The older of the tendency to be a core is estimated to be Au>Pt>Pd>Rh. This order could be explained by the redox potential of the corresponding metal ion and the coordination ability of the metal to polymer.

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页码：111 / 118

页数：8

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