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.