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Cationic Iridium(III) Complex Containing both Triarylboron and Carbazole Moieties as a Ratiometric Fluoride Probe That Utilizes a Switchable Triplet–Singlet Emission
Author(s) -
Xu WenJuan,
Liu ShuJuan,
Zhao XinYan,
Sun Shi,
Cheng Shan,
Ma TingChun,
Sun HuiBin,
Zhao Qiang,
Huang Wei
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201000362
Subject(s) - phosphorescence , photochemistry , carbazole , iridium , photoluminescence , chemistry , ion , fluorescence , fluoride , excited state , cationic polymerization , singlet state , analytical chemistry (journal) , materials science , inorganic chemistry , optoelectronics , physics , organic chemistry , quantum mechanics , nuclear physics , catalysis , biochemistry , chromatography
A novel cationic Ir III complex [Ir(Bpq) 2 (CzbpyCz)]PF 6 (Bpq=2‐[4‐(dimesitylboryl)phenyl]quinoline, CzbpyCz = 5,5′‐bis(9‐hexyl‐9 H ‐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 Φ =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^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 λ =351 nm versus the concentration of F − ions allows efficient and accurate quantification of F − ions in the range 0–50 μ M .