Abstract
This study explores the differential effects of two cyclodextrin hosts, βCD and γCD, on the photophysics of Chrysazine (CZ), a molecule with interesting excited state intramolecular proton transfer (ESIPT) characteristics. Interaction of CZ with βCD significantly enhances the fluorescence intensity of the dye along with a concomitant increase in the fluorescence lifetime, and at the same time decreases the extent of ESIPT in CZ. In marked contrast, the interaction of CZ with γCD quenches the fluorescence of the dye while the excited state lifetime increases only moderately and the ESIPT process remains effectively unchanged. The overall results indicate that the different binding modes and binding stoichiometries of the host-guest complexes formed between CZ and the two hosts, βCD and γCD, play a crucial role in tuning the photophysics of CZ, thus, imparting the remarkably contrasting modulations in the observed fluorescence properties.
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