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Fluorescent behavior of 2-(3,4,5,6-tetrafluoro-2-hydroxyphenyl)imidazo-[1,2-a]pyridine in the presence of metal perchlorate

✍ Scribed by Kiyoshi Tanaka; Tohru Kurushima; Satoru Iwata; Syunsuke Shimada

Publisher: Journal of Heterocyclic Chemistry
Year: 2007
Tongue: English
Weight: 517 KB
Volume: 44
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570440204

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✦ Synopsis

Abstract

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2‐(3,4,5,6‐Tetrafluoro‐2‐hydroxyphenyl)imidazo[1,2‐a]pyridine (1) emits long wavelength light around 540 nm both in polar and in nonpolar solvents. Zn^2+^ perchlorate in acetonitrile causes the intermediate wavelength emission around 430 nm, which is ascribed to the species where the imidazole nitrogen atom and the phenolate oxygen atom bridge Zn^2+^. In the presence of Hg^2+^ and Al^3+^ perchlorates, short wavelength emission around 370 nm is strongly increased and this fluorescent enhancement is attributable not to the coordination of Hg^2+^ and Al^3+^ to 1 but to the formation of the salt of perchloric acid of 1.

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