阳离子表面活性剂溴代十六烷基吡啶胶束对2,4-二硝基氯苯水解反应的影响  

Effects of Cationic Surfactant Cetylpyridine Bromide Micelle upon the Hydrolysis of 2,4-Dinitrochlorobenzene

作　　者：沈吉静[1] 赵振国[1] 马季铭[1] 

机构地区：[1]北京大学物理化学研究所,北京100871

出　　处：《高等学校化学学报》1997年第9期1527-1529,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：阳离子表面活性剂溴代十六烷基吡啶（CPB）胶束对水中OH-和2，4-二硝基氯苯的反应有催化作用．随CPB浓度的增大，反应速率常数开始时迅速增大，然后趋于常数．OH-浓度的增大使胶束催化水解的二级速率常数减小．CPB胶束对此反应的速率提高作用比十六烷基三甲基溴化扶胶束更有效．对这两种胶束催化作用的差异进行了讨论．The Ieaction between hydroxide ion and 2, 4 dinitrochlorobenzene in water wascatalyzed by cationic micelles of cetylpyridine bromide (CPB ). The rate constant first increased sharply. then remained relatively constant as the concentration of CPB increased.The kinetic form can be interpreted quantatively in terms of incorporation of substrate andhydroxide ion into the eationic micelles. Increasing the hydroxide ion concentration decreasedthe second-order rate constant of the micellar-catalyzed hydrolysis. The rate enhancement ismore pronounced in CPB than in cetyltrinlethylammonium1 bromide system. The difference ofthe effects of the two cationic micelles has also been discussed.

关 键 词：胶束催化 二硝基氯 吡啶 CPB 水解 DNCB 

分 类 号：O625.612[理学—有机化学] O626.321[理学—化学]