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A benzoxadiazole–thiourea conjugate as a fluorescent chemodosimeter for Hg(II) in aqueous media

Paper ID Volume ID Publish Year Pages File Format Full-Text
28812 44093 2011 5 PDF Available
Title
A benzoxadiazole–thiourea conjugate as a fluorescent chemodosimeter for Hg(II) in aqueous media
Abstract

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.

Graphical abstractA benzoxadiazole–thiourea conjugate (1) shows selective and quantitative fluorescence decrease upon Hg2+ addition in aqueous media. The fluorescence decrease is promoted by a Hg2+-induced desulfurization of the thiourea moiety, leading to a promotion of intramolecular photoinduced electron transfer from the aniline moiety to the excited state benzoxadiazole moiety.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Benzoxadiazole; Hg(II); Fluorescence; Desulfurization; Chemodosimeter
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A benzoxadiazole–thiourea conjugate as a fluorescent chemodosimeter for Hg(II) in aqueous media
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 219, Issue 1, 5 March 2011, Pages 154–158
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us