The effects of fluoride anions on tryptophan-derived isomeric urea ligands (UT1–UT3) were examined using UV-vis, fluorescence and 1H NMR spectroscopy. Remarkably, the addition of TBAF triggered unusual enhancement of fluorescence for UT1, which emanated from intramolecular charge transfer following fluoride-induced deprotonation of the indole NH proton.
K. Devi and R. J. Sarma, RSC Adv., 2014, 4, 9551 DOI: 10.1039/C3RA46846A
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