Size-specific catalytic activity of polymer-stabilized gold nanoclusters for aerobic alcohol oxidation in water

被引：795

作者：

Tsunoyama, H

Sakurai, H

Negishi, Y

Tsukuda, T ^{[1
]}

机构：

[1] Inst Mol Sci, Res Ctr Mol Scale Nanosci, Okazaki, Aichi 4448585, Japan

[2] Grad Univ Adv Studies, Sch Adv Sci, Dept Photosci, Kanagawa 2400193, Japan

[3] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 26期

关键词：

D O I：

10.1021/ja052161e

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Gold nanoclusters (φ = 1.3 nm) stabilized by poly(N-vinyl-2-pyrrolidone) (Au:PVP NCs) readily oxidize benzylic alcohols to the corresponding aldehydes and/or carboxylic acids under ambient temperature in water. Kinetic measurement revealed that smaller Au:PVP NCs exhibit higher catalytic activity than larger (9.5 nm) homologues and, more surprisingly, than Pd:PVP NCs of comparable size (1.5 and 2.2 nm). On the basis of the marked difference in the kinetic isotope effect and activation energy between Au:PVP and Pd:PVP NCs, a reaction mechanism for alcohol oxidation catalyzed by Au:PVP NCs is proposed in which a superoxo-like molecular oxygen species adsorbed on the surface of the small Au NCs abstracts a hydrogen atom from the alkoxide. Copyright © 2005 American Chemical Society.

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页码：9374 / 9375

页数：2

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