| Project/Area Number |
05453141
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TOSHIMA Naoki Univ.Tokyo, Appl.Chem., Assoc.Prof, 工学部, 助教授 (50011010)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAMURA Tokiji Univ.Tokyo, Appl.Chem., Techn, 工学部, 教務職員 (30107586)
GOTOH Yaeko Univ.Tokyo, Appl.Chem., Lect, 工学部, 講師 (00092388)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1993: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Keywords | Metal cluster / Alloy / Microcluster / Polymer complex / Redox potential / Coordination / Noble metal / Catalyst / 2元金属クラスター / 高分子配位 / 銅 / 白金 / 合金 / 金 / ポリビニルピロリドン |
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| Research Abstract |
1)Refluxing an ethanol/water (1/1, V/V) solution of two kinds of noble metal ions in the presence of polyvinylpyrrolidone gave the colloidal dispersion of bimetallic clusters. The bimetallic clusters were analyzed by an EXAFS technique to have a "coreshell"structure, in which one element forms a core and the other element covers the core to from a shell.
2)The formation process of the bimetallic clusters were analyzed by tracing the electronic spectra with a multi-channel photodiode array. The reduction order is found to be determined by the oxidation-reduction potential.
3)"Microcluster , "a fine metal particle, plays an important role for the formation of bimetallic clusters, especially those with a "cluster-in-cluster"structure.
4)The polymer works as a ligand in the polymer-protected metal clusters and plays an important role for the determination of the "core-shell"structure in bimetallic clusters.
5)A novel method has been developed for the preparation of light transition metal/noble metal bimetallic clusters, which has been thought to be very difficult. The method involves the preparation of particles of metal hydroxide at an initial stage and the reduction of the ions with a polyol method.Copper/palladium and copper/platinum bimetallic clusters have been prepared by this method.
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