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Polymer‐protected bimetallic clusters with various alloying structures
Author(s) -
Toshima Naoki
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961050115
Subject(s) - bimetallic strip , extended x ray absorption fine structure , cluster (spacecraft) , metal , polymer , materials science , absorption (acoustics) , catalysis , absorption spectroscopy , ion , metal ions in aqueous solution , colloid , polymer chemistry , crystallography , inorganic chemistry , chemistry , organic chemistry , composite material , metallurgy , optics , physics , computer science , programming language
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 order 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.