Self-assembly of reverse micelle nanoreactors by zwitterionic polyoxometalate-based surfactants for high selective production ofβ-hydroxyl peroxides  

作　　者：Guicong Hu Wen Chang Sai An Bo Qi Yu-Fei Song 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Chinese Chemical Letters》2022年第8期3968-3972,共5页中国化学快报（英文版）

基　　金：supported by the Beijing Natural Science Foundation(No.2202039);the National Natural Science Foundation of China.(Nos.22178019,22101017,U1707603,21625101,21521005,21808011);the National Key Research and Development Program of China(No.2017YFB0307303);the Fundamental Research Funds for the Central Universities(Nos.XK1802-6,XK1803-05,XK1902,12060093063)。

摘　　要：Surfactants with polyoxometalates(POMs)as polar head groups have shown fascinating self-assembly behaviors and various functional applications.However,self-assembly them into reverse micelles is still challenging owing to the large molecular size and intermolecular strong electrostatic repulsions of POM heads.In this work,a zwitterionic POM-based surfactant was synthesized by covalently grafting two cationic long alkyl tails onto the lacunary site of[PW_(11)O_(39)]^(7-).With decreased electrostatic repulsions and increased hydrophobic effect,the POM-based reverse micelles with an average diameter of 5 nm were obtained.Interestingly,when these reverse micelles were applied for catalyzing the oxidation of styrene,an unprecedentedβ-hydroxyl peroxide compound of 2-hydroxyl-2-phenylethan-1-tert-butylperoxide was produced in high selectivity of 95.2%.In comparison,the cetyltrimethylammonium electrostatically encapsulated POMs mainly generated the epoxides or 1,2-diols.A free radical mechanism was proposed for the oxidation reaction catalyzed by the zwitterionic POM surfactants.

关 键 词：POLYOXOMETALATE SELF-ASSEMBLY PEROXIDE Catalysis Zwitterionic surfactant 

分 类 号：TQ223.25[化学工程—有机化工] TQ423[理学—物理化学] O643.36[理学—化学]