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A Single‐Anion‐Based Red‐Emitting Cationic Diiridium(III) Complex Bearing a Pyrimidine‐Based Bridging Ligand for Oxygen Sensing
Author(s) -
Shi Chao,
Li Qiuxia,
Zou Liang,
Lv Zhuang,
Yuan Aihua,
Zhao Qiang
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800004
Subject(s) - cationic polymerization , chemistry , phosphorescence , bridging ligand , photochemistry , ligand (biochemistry) , luminescence , benzimidazole , ion , excited state , iridium , fluorescence , polymer chemistry , optoelectronics , catalysis , organic chemistry , receptor , biochemistry , physics , quantum mechanics , nuclear physics
Compared with double‐anion‐based cationic diiridium complexes, the study of single‐anion‐based cationic diiridium complexes as emitters is largely unexplored. In this work, two methods were used to prepare single‐anion‐based cationic diiridium complex Ir‐Ir‐1 bearing 2‐pyrimidine‐benzimidazole as bridging ligand, both sides of which are symmetrical structures comprising 2‐phenylpyridine as cyclometalated ligand. It shows efficient red phosphorescence emission with redshift of the emission wavelength by 85 nm relative to the corresponding monoiridium complex Ir‐1 . Moreover, it exhibits long emission lifetime and high oxygen sensitivity, which were attributed to the intraligand charge‐transfer excited state. Hence, Ir‐Ir‐1 was used as a oxygen probe to monitor intracellular O 2 content by time‐resolved luminescence imaging.