Multisignaling detection of Hg2+ based on a phosphorescent iridium(III) complex |
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Authors: | Zhao Qiang Liu Shujuan Li Fuyou Yi Tao Huang Chunhui |
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Institution: | Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, PR China. |
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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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