Selective Hg(II) detection in aqueous solution with thiol derivatized fluoresceins

Inorganic Chemistry
Elizabeth M NolanStephen J Lippard

Abstract

The syntheses and photophysical properties of mercury sensors 2 and 3 (MS2 and MS3), two asymmetrically derivatized fluorescein-based dyes designed for Hg(II) detection, are described. These sensors each contain a single pyridyl-amine-thiol metal-binding moiety, form 1:1 complexes with Hg(II), and exhibit selectivity for Hg(II) over other Group 12 metals, alkali and alkaline earth metals, and most divalent first-row transition metals. Both dyes display superior brightness (Phi x epsilon) and fluorescence enhancement following Hg(II) coordination in aqueous solution. At neutral pH, the fluorescence turn-on derives from greater brightness due to increased molar absorptivity. At higher pH, photoinduced electron transfer quenching of the free dye is enhanced, and the Hg(II)-induced turn-on also benefits from alleviation of this pathway. MS2 can detect ppb levels of Hg(II) in aqueous solution, demonstrating its ability to identify environmentally relevant concentrations of Hg(II).

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Citations

Sep 18, 2012·Inorganic Chemistry·Joydev HataiSubhajit Bandyopadhyay
Apr 14, 2007·Journal of the American Chemical Society·Elizabeth M Nolan, Stephen J Lippard
Dec 22, 2009·Journal of the American Chemical Society·Aneese F ChaudhryChristoph J Fahrni
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