AGGREGATING TENDENCIES OF SOME ALKYLSULFONATES

Aggregation of some sulfur-containing compounds has been studied. The aggregators studied are p-nitrophenyl esters of butylsulfonate (S-4), octylsulfonate (S-8), dodecylsulfonate (S-12), and hexadecylsulfonate (S-16). Their aggregating tendencies have been evaluated By measuring their critical aggregate concentrations (CAgCs) in dioxane-H2O binary mixtures of graded compositions. Our results indicate that the sulfona tes, just like the carboxylates or phosphonates, can also be used as k inetic probes for evaluating CAgC values. If the above-mentioned three types of compounds bearing the same number of methylene groups in the ir chains are compared, then the order of increasing aggregating tende ncy appears to be phosphonate < sulfonate and carboxylate.