Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 335, Issue -, Pages 190-199Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2016.12.003
Keywords
ESIPT; Solvatochromism; Photo-enolization; Ionic recognition; Acetate ion
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Funding
- SERB unit of Department of Science and Technology, New Delhi [SB/FT/CS-010/2013]
- Council of Scientific and Industrial Research (CSIR) [02(0199/14/EMR-II)]
- Department of Science and Technology (DST-FIST program) New Delhi
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A light stimulated photo-enolization in hydroxy imidazole systems (o-hydroxynaphthyl phenanthroimidazole, 3 and o-hydroxyphenyl phenanthroimidazole, 4) by excited state proton transfer induces turn Off' fluorescence and ratiometric changes in the absorption spectrum. Benzyl phenanthroimidazole (5) does not exhibit the photo-enolization due to absence of o-hydroxyl group. Solvatochromism, time resolved photoluminescence measurement and ionic interactions studies of 3-5 are examined in semi-aqueous medium through UV-vis and fluorescence spectroscopy. Fluorescent probe 3 exhibits fluorescence turn Off and turn On responses with acetate ions in semi-aqueous medium by tuning the excitation wavelength. (C) 2016 Elsevier B.V. All rights reserved.
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