Growth of Au-Pd2Sn Nanorods via Galvanic Replacement and Their Catalytic Performance on Hydrogenation and Sonogashira Coupling Reactions
Nafria, Raquel (Institut de Recerca en Energia de Catalunya)
Luo, Zhishan (Institut de Recerca en Energia de Catalunya)
Ibáñez, Maria (EMPA-Swiss Federal Laboratories for Materials Science and Technology)
Martí-Sánchez, Sara (Institut Català de Nanociència i Nanotecnologia)
Yu, Xiaoting (Institut de Recerca en Energia de Catalunya)
De La Mata, Maria (Institut Català de Nanociència i Nanotecnologia)
Llorca, Jordi (Universitat Politècnica de Catalunya. Departament d'Enginyeria Química)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Kovalenko, Maksym V. (ETH Zürich. Department of Chemistry and Applied Biosciences)
Grabulosa, Arnald (Universitat de Barcelona. Departament de Química Inorgànica i Orgànica)
Muller, Guillermo (Universitat de Barcelona. Departament de Química Inorgànica i Orgànica)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Date:	2018
Abstract:	Colloidal PdSn and Au-PdSn nanorods (NRs) with tuned size were produced by the reduction of Pd and Sn salts in the presence of size- and shape-controlling agents and the posterior growth of Au tips through a galvanic replacement reaction. PdSn and Au-PdSn NRs exhibited high catalytic activity toward quasi-homogeneous hydrogenation of alkenes (styrene and 1-octene) and alkynes (phenylacetylene and 1-octyne) in dichloromethane. Au-PdSn NRs showed higher activity than PdSn for 1-octene, 1-octyne, and phenylacetylene. In Au-PdSn heterostructures, X-ray photoelectron spectroscopy evidenced an electron donation from the PdSn NR to the Au tips. Such heterostructures showed distinct catalytic behavior in the hydrogenation of compounds containing a triple bond such as tolan. This can be explained by the aurophilicity of triple bonds. To further study this effect, PdSn and Au-PdSn NRs were also tested in the Sonogashira coupling reaction between iodobenzene and phenylacetylene in N,N-dimethylformamide. At low concentration, this reaction provided the expected product, tolan. However, at high concentration, more reduced products such as stilbene and 1,2-diphenylethane were also obtained, even without the addition of H. A mechanism for this unexpected reduction is proposed.
Grants:	Ministerio de Economía y Competitividad ENE2013-46624-C4-3-R Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Ministerio de Economía y Competitividad CTQ2015-65040-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Ministerio de Economía y Competitividad SEV-2013-0295
Note:	Altres ajuts: Beatriu de Pinós postdoctoral grant (2013 BP-A00344)
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Catalytic behaviour ; Catalytic performance ; Electron donation ; Galvanic replacement reactions ; Galvanic replacements ; Low concentrations ; Phenylacetylenes ; Sonogashira coupling reactions
Published in:	Langmuir, Vol. 34, Issue 36 (September 2018) , p. 10634-10643, ISSN 1520-5827

DOI: 10.1021/acs.langmuir.8b02023
PMID: 30096238

Postprint 36 p, 1.5 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles