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  • Title: Multisignaling detection of Hg2+ based on a phosphorescent iridium(III) complex.
    Author: Zhao Q, Liu S, Li F, Yi T, Huang C.
    Journal: Dalton Trans; 2008 Aug 07; (29):3836-40. PubMed ID: 18629405.
    Abstract:
    A multisignaling chemosensor for Hg(2+) based on the iridium(III) complex Ir(thq)(2)(acac) was realized through UV-Vis absorption, phosphorescent emission and electrochemical measurements. Upon addition of Hg(2+), an obvious blue-shift in absorption spectra and a strong decrease of emission intensity were measured for Ir(thq)(2)(acac), which could be observed by the naked eye. Hg(2+) is coordinated to Ir(thq)(2)(acac), forming a 1 : 1 complex. Because Hg(2+) is a thiophilic metal ion, the interaction between Hg(2+) and the sulfur atom of cyclometalated ligands is responsible for the significant variations in optical and electrochemical signals.
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