期刊
CHEMCATCHEM
卷 9, 期 8, 页码 1442-1449出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201601519
关键词
bimetallic catalysts; graphene; magnetic nanoparticles; Sonogashira reaction; quantum dots
资金
- Institute for Advanced Studies in Basic Sciences (IASBS) Research Council
- Iran National Science Foundation (INSF) [94010666]
- Spanish Ministerio de Economia y Competitividad (MINECO) [CTQ2013-43446-P, CTQ2014-51912-REDC]
- FEDER
- Generalitat Valenciana [PROMETEOII/2014/017]
- University of Alicante
In this report, Fe3O4 nanoparticles are modified for the first time with graphene quantum dots (GQD) and used for the stabilization of PdCu bimetallic nanoparticles. The new magnetic compound, PdCu@GQD@Fe3O4, is characterized by different methods such as SEM, high-resolution (HR)-TEM, energy-dispersive X-ray spectroscopy (EDS) mapping, XRD, and X-ray photoelectron spectroscopy (XPS). This material is applied as an efficient catalyst for the Sonogashira reaction of aryl iodides, bromides, and chlorides in toluene or N,N-dimethylacetamide at 60-110 degrees C in very high yields with 0.3 mol% of Pd loading. According to different tests, such as polyvinylpyridine poisoning, hot filtration, and kinetic studies, this catalyst works under heterogeneous conditions. By magnetic separation of the catalyst, it can be recycled for six consecutive runs with only a small decrease in activity without appreciable structural modification of the reused catalyst, which is characterized by TEM and XPS.
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