期刊
NANOMATERIALS
卷 6, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/nano6030054
关键词
N-aryl hydroxylamines; titania; aryl amines; nitroarenes; silver nanoparticles; selective reduction; heterogeneous catalysis
类别
资金
- European Union
- Greek Ministry of Education [ERC-09, ARISTEIA-2691]
- COST action [CM1201]
In this study, we report the fabrication of mesoporous assemblies of silver and TiO2 nanoparticles (Ag/MTA) and demonstrate their catalytic efficiency for the selective reduction of nitroarenes. The Ag/TiO2 assemblies, which show large surface areas (119-128 m(2)center dot g(-1)) and narrow-sized mesopores (ca. 7.1-7.4 nm), perform as highly active catalysts for the reduction of nitroarenes, giving the corresponding aryl amines and N-aryl hydroxylamines with NaBH4 and ammonia-borane (NH3BH3), respectively, in moderate to high yields, even in large scale reactions (up to 5 mmol). Kinetic studies indicate that nitroarenes substituted with electron-withdrawing groups reduced faster than those with electron-donating groups. The measured positive rho values from the formal Hammett-type kinetic analysis of X-substituted nitroarenes are consistent with the proposed mechanism that include the formation of possible [Ag]-H hybrid species, which are responsible for the reduction process. Because of the high observed chemo selectivities and the clean reaction processes, the present catalytic systems, i.e., Ag/MTA-NaBH4 and Ag/MTA-NH3BH3, show promise for the efficient synthesis of aryl amines and N-aryl hydroxylamines at industrial levels.
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