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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/31465
Title: Bimetallic gold-palladium alloy nanoclusters: An effective catalyst for Ullmann coupling of chloropyridines under ambient conditions
Authors: Raghu Nath Dhital
Choavarit Kamonsatikul
Ekasith Somsook
Hidehiro Sakurai
National Institutes of Natural Sciences - Institute for Molecular Science
Japan Science and Technology Agency
Mahidol University
Keywords: Chemical Engineering
Issue Date: 1-Oct-2013
Citation: Catalysis Science and Technology. Vol.3, No.11 (2013), 3030-3035
Abstract: An efficient method for the Ullmann coupling of chloropyridines catalyzed by poly(N-vinylpyrrolidone) (PVP)-stabilized bimetallic Au-Pd alloy nanoclusters (NCs) under ambient conditions is demonstrated. The reaction does not occur with either gold or palladium single-metal clusters alone, nor with a physical mixture of the two metals. The experimental results indicate that the inclusion of Au as a nearest heteroatom is crucial to initiate the coupling and its composition up to 50% is essential to accelerate the reaction. Unlike the conventional transition metal catalysis, 2-chloropyridine was found to be highly reactive as compared to 2-bromopyridine. From the UV-vis and ICP-AES measurements, a significant amount of leached Pd(ii) was observed in the coupling with 2-bromopyridine as compared with 2-chloropyridine, indicating that the leaching process might be a crucial factor in diminishing the reactivity. © 2013 The Royal Society of Chemistry.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84885653862&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/31465
ISSN: 20444761
20444753
Appears in Collections:Scopus 2011-2015

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