A Highly Selective and Multisignaling Optical-Electrochemical Sensor for Hg2+ Based on a Phosphorescent Iridium(III) Complex
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- 作者：Qiang Zhao ; Tianye Cao ; Fuyou Li ; Xianghong Li ; Hao Jing ; Tao Yi ; Chunhui Huang
- 刊名：Organometallics
- 出版年：2007
- 出版时间：April 9, 2007
- 年：2007
- 卷：26
- 期：8
- 页码：2077 - 2081
- 全文大小：278K
- 年卷期：v.26,no.8(April 9, 2007)
- ISSN：1520-6041
文摘
A highly selective phosphorescent chemosensor for Hg2+ based on the iridium(III) complex Ir(btp)2(acac) was realized. Multisignaling changes were observed through UV-vis absorption, phosphorescentemission, and electrochemical measurements. Upon addition of Hg2+, the obvious spectral blue-shifts inabsorption and phosphorescent emission bands were measured for Ir(btp)2(acac), which could be observedby the naked eye. Further investigation indicated that the interaction between Hg2+ and the sulfur ofcyclometalated ligands is responsible for the significant variation in optical and electrochemical signals,which was also confirmed by density functional theory (DFT) calculation. It is the charge transfer fromthe iridium center to cyclometalated ligands that increases the electron density of cyclometalated ligands,which makes the coordination of sulfur to Hg2+ easier.