Issue 12, 2003
From the journal:

Journal of Materials Chemistry

Metal and size effects on structures and photophysical properties of porphyrin-modified metal nanoclusters

Hiroshi Imahori,*a   Yukiyasu Kashiwagi,b   Takeshi Hanada,c   Yoshiyuki Endo,b   Yoshinobu Nishimura,d   Iwao Yamazaki*d  and  Shunichi Fukuzumi*b  

* Corresponding authors

a Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, Japan Science and Technology Agency (JST), Katsura, Nishikyo-ku, Kyoto 615-8510 and Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto, Japan
E-mail: imahori@scl.kyoto-u.ac.jp
Fax: 81 75383 2566
Tel: 81 75383 2571

b Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Agency (JST), Suita, Osaka, Japan
E-mail: fukuzumi@chem.eng.osaka-u.ac.jp
Fax: 81 66879 7370
Tel: 81 66879 7368

c The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihoga-oka, Ibaraki, Osaka, Japan

d Department of Molecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Japan
E-mail: yamiw@eng.hokudai.ac.jp
Fax: 81 11709 2037
Tel: 81 11706 6606

Abstract

Three-dimensional (3D) porphyrin monolayer protected metal nanoclusters (MPCs) have been prepared to examine the effects of metal (Au, Ag, Au–Ag alloy, Pd and Pt) and size (1–3 nm) on the structures and photophysical properties. The quenching rate constants of the porphyrin excited singlet state by the surfaces of mono-metal nanoclusters and gold nanoclusters with different diameters are virtually the same. In contrast, the quenching rate constant of the gold–silver alloy nanocluster is half that of the corresponding mono-metal clusters (i.e. Au or Ag). This reveals that interaction between the surface of the gold–silver alloy and the porphyrin excited singlet state is attenuated as compared wtih the mono-metal systems. Thus, porphyrin metal alloy nanoclusters are potential candidates as a new type of artificial photosynthetic materials and photocatalysts.

Graphical abstract: Metal and size effects on structures and photophysical properties of porphyrin-modified metal nanoclusters

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Article information

DOI
https://doi.org/10.1039/B309588F
Article type
Paper
Submitted
11 Aug 2003
Accepted
06 Oct 2003
First published
04 Nov 2003

J. Mater. Chem., 2003,13, 2890-2898

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Metal and size effects on structures and photophysical properties of porphyrin-modified metal nanoclusters

H. Imahori, Y. Kashiwagi, T. Hanada, Y. Endo, Y. Nishimura, I. Yamazaki and S. Fukuzumi, J. Mater. Chem., 2003, 13, 2890 DOI: 10.1039/B309588F

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