Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 219, Issue 1, Pages 154-158Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.02.005
Keywords
Benzoxadiazole; Fig(II); Fluorescence; Desulfurization; Chemodosimeter
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [21760619]
- Grants-in-Aid for Scientific Research [23656503] Funding Source: KAKEN
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A benzoxadiazole-thiourea conjugate (1) was synthesized and used for chemodosimetric detection of Hg2+ in aqueous media. The compound 1 shows a selective and quantitative fluorescence quenching upon addition of Hg2+. This is promoted via a Hg2+-induced desulfurization of the thiourea moiety, leading to a formation of an imidazoline derivative, 2. Ab initio molecular orbital calculation reveals that the formation of imidazoline moiety by the reaction of 1 with Hg2+ promotes a photoinduced electron transfer from the aniline moiety to the excited state benzoxadiazole moiety and results in fluorescence quenching. (C) 2011 Elsevier B.V. All rights reserved.
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