Abstract

The existence of a special type of surfactant micelles formed on the solubilization core of phthalocyanine at concentrations significantly below the critical micelle concentration (CMC) has been established. This discovery overturns the traditional concepts of colloidal chemistry, which imply that the surfactant micelles are first formed, and then solubilization occurs in them above the CMC. In the process of solubilization, phthalocyanines (usually existing in an aqueous solution in the form of dimers) undergo monomerization, which is crucial for the manifestation of the functional properties of their molecules. Here, the spectrophotometric study of crown-substituted magnesium phthalocyaninate (I) in an aqueous solution of sodium dodecyl sulfate (II) is reported. It has been found that specific micelles of II (they can be called proto-micelles) involving dimers of I are formed significantly below the CMC. The solubilization capacity of micelles determined from experimental data leads, as calculated per molecule of I in a micelle, to an abnormally large aggregation number (309). This phenomenon can be explained by the formation of a bimodal distribution of micelles, in which micelles with solubilizate coexist with “empty” micelles, so that the average number of solubilizate molecules in a micelle can be less than unity.

中文翻译：

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新型胶束和表面活性剂水溶液中酞菁的单体浓度

摘要

已经建立了在酞菁的增溶核心上以明显低于临界胶束浓度（CMC）的浓度形成的特殊类型的表面活性剂胶束的存在。这一发现推翻了胶体化学的传统概念，这意味着表面活性剂胶束首先形成，然后在CMC上方的胶束中发生增溶。在增溶过程中，酞菁（通常以二聚体形式存在于水溶液中）经历单体化，这对于它们分子的功能特性的表现至关重要。在这里，分光光度法研究十二烷基硫酸钠（II）中冠取代的酞菁镁（I））被报告。已经发现，涉及I的二聚体的II的特定胶束（它们可以称为原胶束）在CMC下方明显形成。根据实验数据确定的胶束增溶能力（按胶束中每个I分子计算得出）导致异常大的聚集数（309）。这种现象可以通过胶束双峰分布的解释来解释，胶束中具有可溶物的胶束与“空”胶束共存，因此胶束中的可溶物分子的平均数量可以小于1。