Pagliero D, Argüello GA, Gsponer HE
Departamento de Físico-Química, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, 5000, Argentina
J Colloid Interface Sci. 1999 Jul 1;215(1):16-22. doi: 10.1006/jcis.1999.6180.
Binding interactions of alpha-diimine-chromium(III) complexes with sodium dodecyl sulfate (SDS) were studied in air-saturated solution and in N2-purged solution using lifetime measurements. The lifetime titration curves consisted of two regions with different slopes: one of them negative and more pronounced at low concentrations of SDS until reaching a minimum and the other, at a later stage, with a less pronounced positive slope till a plateau was reached. This biphasic behavior of lifetime-SDS concentration data revealed the presence of premicellar aggregates at low SDS concentration and the formation of normal micelles at high surfactant concentration. The results were analyzed with a model that includes binding of the sensitizer to micelles and to small premicellar aggregates. Binding constants obtained by fitting of lifetime titration curves are in agreement with the electrostatic interactions between the complexes and the surfactant and with the hydrophobic interactions between the ligands of the complexes and the formed micelle. Copyright 1999 Academic Press.
使用寿命测量法，在空气饱和溶液和氮气吹扫溶液中研究了α-二亚胺铬（III）配合物与十二烷基硫酸钠（SDS）的结合相互作用。寿命滴定曲线由两个具有不同斜率的区域组成：其中一个为负，在低浓度SDS时更为明显，直至达到最小值；另一个在后期具有不太明显的正斜率，直至达到平稳状态。寿命-SDS浓度数据的这种双相行为表明，在低SDS浓度下存在前胶束聚集体，在高表面活性剂浓度下形成正常胶束。用一个模型对结果进行了分析，该模型包括敏化剂与胶束和小前胶束聚集体的结合。通过拟合寿命滴定曲线获得的结合常数与配合物和表面活性剂之间的静电相互作用以及配合物配体与形成的胶束之间的疏水相互作用一致。版权所有1999年学术出版社。
