Journal
INORGANIC CHEMISTRY
Volume 45, Issue 6, Pages 2742-2749Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic052083w
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Funding
- NCRR NIH HHS [1S10RR13886-01] Funding Source: Medline
- NIGMS NIH HHS [R01 GM065519, GM65519, R01 GM065519-01] Funding Source: Medline
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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 ((D x c) 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(ll)-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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