Home > Articles > Published articles > Growth of Au-Pd2Sn Nanorods via Galvanic Replacement and Their Catalytic Performance on Hydrogenation and Sonogashira Coupling Reactions |
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 |
Postprint 36 p, 1.5 MB |