Effects of doping in 25-atom bimetallic nanocluster catalysts for carbon–carbon coupling reaction of iodoanisole and phenylacetylene
| Autor: | Gao Li, Jin Wang, Xiujuan Yang, Zhimin Li, Chao Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Silver
Materials science Sonogashira coupling chemistry.chemical_element 02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences Coupling reaction Catalysis Nanoclusters chemistry.chemical_compound lcsh:TA401-492 General Materials Science General Bimetallic strip Platinum Carbon–carbon coupling reactions 021001 nanoscience & nanotechnology Au25 nanocluster 0104 chemical sciences Crystallography Phenylacetylene chemistry Doping effects lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Selectivity Copper |
| Zdroj: | Progress in Natural Science: Materials International, Vol 26, Iss 5, Pp 477-482 (2016) |
| ISSN: | 1002-0071 |
| DOI: | 10.1016/j.pnsc.2016.09.007 |
| Popis: | We here report the catalytic effects of foreign atoms (Cu, Ag, and Pt) doped into well-defined 25-gold-atom nanoclusters. Using the carbon-carbon coupling reaction of p -iodoanisole and phenylacetylene as a model reaction, the gold-based bimetallic M x Au 25−x (SR) 18 (–SR=–SCH 2 CH 2 Ph) nanoclusters (supported on titania) were found to exhibit distinct effects on the conversion of p -iodoanisole as well as the selectivity for the Sonogashira cross-coupling product, 1-methoxy-4-(2-phenylethynyl)benzene). Compared to Au 25 (SR) 18 , the centrally doped Pt 1 Au 24 (SR) 18 causes a drop in catalytic activity but with the selectivity retained, while the Ag x Au 25−x (SR) 18 nanoclusters gave an overall performance comparable to Au 25 (SR) 18 . Interestingly, Cu x Au 25−x (SR) 18 nanoclusters prefer the Ullmann homo-coupling pathway and give rise to product 4,4′-dimethoxy-1,1′-biphenyl, which is in opposite to the other three nanocluster catalysts. Our overall conclusion is that the conversion of p -iodoanisole is largely affected by the electronic effect in the bimetallic nanoclusters’ 13-atom core (i.e., Pt 1 Au 12 , Cu x Au 13−x , and Au 13 , with the exception of Ag doping), and that the selectivity is primarily determined by the type of atoms on the M x Au 12−x shell (M=Ag, Cu, and Au) in the nanocluster catalysts. |
| Databáze: | OpenAIRE |
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