Journal
SCIENCE CHINA-CHEMISTRY
Volume 54, Issue 11, Pages 1750-1758Publisher
SCIENCE PRESS
DOI: 10.1007/s11426-011-4359-y
Keywords
F- sensor; iridium(III) complex; NIR-infrared; phosphorescent; triarylboron
Categories
Funding
- National Basic Research Program of China (973 Program) [2009CB930601]
- National Natural Science Foundation of China [50803028, 20804019, 61006007]
- Natural Science Foundation of Jiangsu Province of China [BK2009427]
- Natural Science Fund for Universities in Jiangsu [10KJB430010]
- Scientific and Technological Activities for Returned Scholars in Nanjing City [NJ209001]
- Nanjing University of Posts and Telecommunications [NY208045]
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In this work, a near-infrared (NIR) phosphorescent probe for F- based on a cationic Ir(III) complex [Ir(Bpq)(2)(quqo)]PF6 (1) with dimesitylboryl (Mes2B) groups on the cyclometalated Ca N ligands (Bpq) and 2-(quinolin-2-yl)quinoxaline (quqo) as Na N ligand was designed and synthesized. The excited state properties of 1 were investigated in detail using molecular orbital calculations and experimental methods. Upon excitation, complex 1 shows NIR phosphorescent emission around 680 nm. Interestingly, the complex can be excited with long wavelength around 610 nm. Such long-wavelength excitation can reduce the background emission interference and improve the signal-to-noise ratio. Furthermore, the selective binding between boron atom and F- can give rise to the quenching of emission and realize the near-infrared phosphorescent sensing for F-. We wish that the results reported herein will be helpful for the further design of excellent near-infrared phosphorescent probes based on heavy-metal complexes.
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