Study on premicellar and micellar aggregates of gemini surfactants with hydroxyl substituted spacers in aqueous solution using a probe showing TICT fluorescence properties

摘要: Abstract The aggregation properties of two gemini surfactants, 12-3(OH)-12,2Br− and 12-4(OH)2-12,2Br− with hydroxyl substituted spacer group have been studied. changes in photophysical a single probe, trans-2-[4-(dimethylamino)styryl]benzothiazole (DMASBT) showing dipolar nature its twisted intramolecular charge transfer (TICT) excited state exploited rather than using multiple probes to describe various micellar aggregates. Formation number premicellar aggregates has demonstrated addition the description micropolarity microviscosity environment steady-state fluorescence spectroscopy anisotropy DMASBT. Conductometric measurements carried out determine degree ionization (α) verify critical micelle concentration (CMC) values estimated by method. Hydroxyl induces formation around probe molecules increases on going from growth continuous increase environment. 12-4(OH)2-12 is found be less that 12-3(OH)-12. are higher CMC increases, whereas α decreases increasing chain length as well substitution group.