Abstract
Abstract 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.
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