期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 16, 期 24, 页码 7125-7133出版社
WILEY-BLACKWELL
DOI: 10.1002/chem.201000362
关键词
boron; iridium; luminescence; phosphorescence; sensors
资金
- National Basic Research Program of China (973 Program) [2009CB930601]
- National Natural Science Foundation of China [50803028, 20804019, 20774043]
- Natural Science Foundation of Jiangsu Province of China [BK2009427]
- Natural Science Fund for Colleges and Universities in Jiangsu Province [08 KJD430017]
- Scientific and Technological Innovation Teams of Colleges and Universities in Jiangsu Province [TJ207035, TJ209035]
- Nanjing University of Posts and Telecommunications [NY208045]
- University of Jiangsu Province [CX08B_084Z]
A novel cationic Ir(III) complex [Ir(Bpq)(2)(CzbpyCz)]PF(6) (Bpq =2-[4-(dimesitylboryl)phenyl]quinoline, CzbpyCz = 5,5'-bis(9-hexyl-9H-carbazol-3-yl)-2,2'-bipyridine) containing both triarylboron and carbazole moieties was synthesized. The excited-state properties of [Ir(Bpq)(2)(CzbpyCz)]PF(6) were investigated through UV/Vis absorption and photoluminescence spectroscopy and molecular-orbital calculations. This complex displayed highly efficient orange-red phosphorescent emission with an emission peak of 583 nm and quantum efficiency of Phi = 0.30 in dichloromethane at room temperature. The binding of fluoride ions to [Ir(Bpq)(2)(CzbpyCz)]PF(6) can quench the phosphorescent emission from the Ir(III) complex and enhance the fluorescent emission from the N boolean AND N ligand, which corresponds to a visual change in the emission from orange-red to blue. Thus, both colorimetric and ratiometric fluoride sensing can be realized. Interestingly, an unusual intense absorption band in the visible region was observed. And the detection of F(-) ions can also be carried out with visible light as the excitation wavelength. More importantly, the linear response of the probe absorbance change at lambda=351 nm versus the concentration of F(-) ions allows efficient and accurate quantification of F(-) ions in the range 0-50 mu M.
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