文献类型：期刊文献

英文题名：Cooperative Effects in Catalytic Hydrogenation Regulated by both the Cation and Anion of an Ionic Liquid

作者：Zhu, Wenwen[1];Yu, Yinyin[1];Yang, Hanmin[2,3];Hua, Li[1];Qiao, Yunxiang[1];Zhao, Xiuge[1];Hou, Zhenshan[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]S Cent Univ Nationalities, State Ethn Affairs Commiss, Key Lab Catalysis & Mat Sci, Wuhan 430074, Peoples R China;[3]S Cent Univ Nationalities, Minist Educ Hubei Prov, Wuhan 430074, Peoples R China

年份：2013

卷号：19

期号：6

起止页码：2059

外文期刊名：CHEMISTRY-A EUROPEAN JOURNAL

收录：;EI(收录号：20130616003794);WOS:【SCI-EXPANDED(收录号:WOS:000314217100026)】；

基金：The authors are grateful for support from the National Natural Science Foundation of China (No. 21073058), the Research Fund for the Doctoral Program of Higher Education of China (20100074110014), and the Fundamental Research Funds for the Central Universities. The authors would also like to express their thanks to Prof. Walter Leitner for his valuable suggestion.

语种：英文

外文关键词：hydrogenation; ionic liquids; nanoparticles; thermoregulated phase separation; transition metals

摘要：The use of transition-metal nanoparticles/ionic liquid (IL) as a thermoregulated and recyclable catalytic system for hydrogenation has been investigated under mild conditions. The functionalized ionic liquid was composed of poly(ethylene glycol)-functionalized alkylimidazolium as the cation and tris(meta-sulfonatophenyl)phosphine ([P(C6H4-m-SO3)3]3) as the anion. Ethyl acetate was chosen as the thermomorphic solvent to avoid the use of toxic organic solvents. Due to a cooperative effect regulated by both the cation and anion of the ionic liquid, the nanocatalysts displayed distinguished temperature-dependent phase behavior and excellent catalytic activity and selectivity, coupled with high stability. In the hydrogenation of ,-unsaturated aldehydes, the ionic-liquid-stabilized palladium and rhodium nanoparticles exhibited higher selectivity for the hydrogenation of the CC bonds than commercially available catalysts (Pd/C and Rh/C). We believe that the anion of the ionic liquid, [P(C6H4-m-SO3)3]3, plays a role in changing the surrounding electronic characteristics of the nanoparticles through its coordination capacity, whereas the poly(ethylene glycol)-functionalized alkylimidazolium cation is responsible for the thermomorphic properties of the nanocatalyst in ethyl acetate. The present catalytic systems can be employed for the hydrogenation of a wide range of substrates bearing different functional groups. The catalysts could be easily separated from the products by thermoregulated phase separation and efficiently recycled ten times without significant changes in their catalytic activity.