Cationic micellar effect on the kinetics of the protolysis of aromatic carboxylic acids studied by the ultrasonic absorption method
作者:Teruyo Isoda、Miyuki Yamasaki、Hiroshige Yano、Takayuki Sano、Shoji Harada
DOI:10.1039/ft9949000869
日期:——
The protolysis of carboxylic acids has been kinetically studied by the ultrasonic absorption method in the presence of tetradecyltrimethylammonium bromide (TTAB) micelles in aqueous solution. The carboxylic acids studied were classified into two categories, one capable of formation of intramolecular hydrogen bond, namely the salicylic acid derivatives (SAD) and the other which cannot form the bond
在水溶液中存在十四烷基三甲基溴化铵(TTAB)胶束的情况下,通过超声吸收法对羧酸的原位动力学进行了动力学研究。研究的羧酸分为两类,一类能够形成分子内氢键,即水杨酸衍生物(SAD),另一类不能形成该键,即苯甲酸衍生物(BAD)。所述速率常数(γ 2 ķ ˚F,ķ b),表观解离常数(ķ一个),并且将反应(Δ的体积变化V获得)。不同的K a关于分子内氢键的影响讨论了SAD和BAD观察到的速率常数的依赖性。还观察到SAD和BAD的ΔV的p K a依赖性。这些依赖性大于水溶液中的依赖性。该结果归因于胶束溶液和水溶液中水分子在溶质周围的排列方式的变化。