Effect of micelle formation on the absorption spectra of decyl and dodecyl pyridinium iodides

Abstract 1. 1. Absorption spectra are presented for solutions of dodecyl pyridinium iodide in water, ethanol, and chloroform (containing 0.7% ethanol), and for decyl pyridinium iodide in water and in ethanol. 2. 2. The change of absorption spectrum with concentration in water can be related to the critical micelle concentration of these salts. 3. 3. The changes of absorption spectrum above the critical micelle concentration have been discussed in terms of the structure of the micelle.