A Complex Generated in a Cationic Surfactant-Aromatic Additive System

Abstract

Abstract Aqueous binary solutions of hexadecyltrimethylammonium bromide (HTAB) and o-iodophenol (OIPh) exhibit remarkable viscoelasticity. From the centrifuged sediment of such a solution a crystalline product was isolated on long standing. Elementary analysis of the crystals for C, H, and N gave an estimated composition consistent with a one-to-one molar ratio of the two substances. Comparisons with DSC and IR measurements on the crystal and equimolar mechanical mixtures suggested that a crystalline complex was formed characterized by low thermal stability.