Abstract

Solubilization of crown-substituted magnesium phthalocyaninate(I) has been studied by spectrophotometry in aqueous solutions of tetradecyltrimethylammonium(II), hexadecyltrimethylammonium(III), and hexadecyltriphenylphosphonium bromides. The experiments have been carried out with saturated solutions of I occurring at the thermodynamic equilibrium with its precipitate. The experimental data have been used to determine the following thermodynamic characteristics of the solubilization: the solubilization capacity of micelles, the coefficient of solubilisate partition between micelles and an ambient solution, and the standard solubilization affinity of I. It has been shown that, in spite of different structures of the surfactants, the standard works of a I molecule transfer to micelles of all three surfactants are almost equal. The found values of the solubilization capacity, as calculated per one molecule of I, in micelles of II and III lead to abnormally large aggregation numbers. This fact may be explained by possible development of a bimodal distribution of micelles, at which solubilisate-containing micelles coexist with “empty” micelles; as a result, the average number of solubilisate molecules in a micelle may appear to be smaller than unity.

中文翻译：

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阳离子表面活性剂水溶液中冠取代酞菁镁溶解的热力学研究

摘要

通过分光光度法在十四烷基三甲基铵（II），十六烷基三甲基铵（III）和十六烷基三苯基溴化aqueous的水溶液中分光光度法研究了冠取代的酞菁镁（I）的增溶作用。实验是在I的热力学平衡及其沉淀出现的饱和I溶液中进行的。实验数据已用于确定以下增溶作用的热力学特征：胶束的增溶能力，胶束与环境溶液之间的增溶物分配系数以及I的标准增溶亲和力。对于表面活性剂的不同结构，I分子转移到所有三种表面活性剂的胶束的标准功几乎是相等的。在II和III的胶束中，发现的增溶能力值（按每1个I分子计算）导致异常大的聚集数。这个事实可以通过胶束双峰分布的可能发展来解释，在胶束中含可溶性胶束的胶束与“空”胶束共存。结果，胶束中可溶物分子的平均数量可能看起来小于1。