Journal
TETRAHEDRON LETTERS
Volume 50, Issue 16, Pages 1783-1786Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2009.01.118
Keywords
Mercury sensor; Fluoroionophore; Hg2+ selectivity; Chromophore
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Funding
- The Thailand Research Fund, Thailand [MRG5180206]
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A novel macromolecule based on 2-[3-(2-aminoethylthio)propylthio]ethanamine covalently bound to two 7-nitrobenzo-2-oxa-1,3-diazolyl moieties was prepared as a fluoroionophore and a chromophore for the selective optical detection of Hg2+. The sensor was prepared in two steps and its fluoroionophoric and chromophoric properties toward various transition metal, alkali, and alkali earth cations were investigated. Compound 4 selectively binds Hg2+, and the binding is indicated by both fluorescence quenching and a chromogenic change which can be detected by the naked eye. In an 80:20 acetonitrile/water solvent mixture, 4 acts as an ON-OFF fluorescence switch upon Hg2+ binding, exhibiting efficient quenching and a detection limit of 10(-7) M or 20 ppb. (C) 2009 Elsevier Ltd. All rights reserved.
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