Abstract
Photophysics and excited-state prototropy of 1-naphthol-2-sulfonic acid (1NpS) and 2-naphthol-3,6-disulfonic acid (2NpDS) are investigated in cationic and reverse micelles (RM). In CTAB micelles, their prototropic forms are interconverted comparably. This behavior is utilized to estimate the CMC of CTAB (0.85, 0.92 mM with 1NpS, 2NpDS, respectively). Importantly, prototropies and excited-state-proton-transfers (ESPT) are quite different for these molecules. Actually, 1NpS exhibits slow ESPT above CMC, whereas, 2NpDS shows slow ESPT below CMC and above no further change observed. In CTAB RM, these probes show quite comparable fluorescence properties. But, the spectral analyses reveal that probe molecules behave differently due to their locations. 2NpDS occupies the surfactant-water interface, whereas, 1NpS prefers the core of RM water-pool. Exploration of the excited-state dynamical processes in photoacids can open up avenues to explore vivid details of the immediate environment of the probe. Indeed such studies are very important to model photoinduced aspects of various living systems.
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