Citation: Qiao-Wen CHANG, Zhu-An CHEN, Lu FENG, Wen JIANG, Cai-Xian YAN, Wei-Ping LIU, Fu-Quan BAI. Synthesis and photophysical properties of phenylquinoline iridium complexes controlled by electron-withdrawing groups[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(2): 255-262. doi: 10.11862/CJIC.2022.283 shu

Synthesis and photophysical properties of phenylquinoline iridium complexes controlled by electron-withdrawing groups

1.
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming Guiyan New Material Technology Co., Ltd., Yunnan Precious Metals Lab Co., Ltd., Kunming 650106, China
2.
Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China

Corresponding author: Cai-Xian YAN, ycx19860706@163.com Fu-Quan BAI, Baifq@jlu.edu.cn
Received Date: 14 July 2022
Revised Date: 15 November 2022

Figures(5)

To study the effect of substituents on iridium phosphorescent complexes, fluorine, methoxy, or trifluoromethyl were introduced into positions 2 and 4 of phenyl at the same time to obtain 2, 4-disubstituted phenyl-4-methylquinoline (2, 4-2R-mpq). Three new iridium phosphorescent complexes (2, 4-2R-mpq)₂Ir(tmd) (R=F (1), MeO (2), CF₃ (3)) were synthesized by using 2, 2, 6, 6-tetramethylheptanedione (tmd) as the auxiliary ligand, and 2, 4-2R-mpq with the electron-withdrawing group as the main ligands. The compositions and chemical structures of the complexes were characterized by elemental analysis, NMR spectroscopy, and single-crystal X-ray diffraction. The three iridium complexes belong to the triclinic system with the P1 space group. The photophysical properties of the complexes were studied by UV - Vis absorption spectroscopy, photoluminescence spectroscopy, and theory calculation. The results indicate that complexes 1, 2, and 3 with the photoluminescence quantum yields of 96%, 80%, and 80% exhibited maximum emission peaks at 570, 582, and 604 nm, respectively. When F and MeO are introduced into the 2 and 4 positions of phenyl on the main ligand, the electron cloud of complexes 1 and 2 are aggregated, while the CF₃ is introduced, and the electron cloud of the complex is dispersed. Compared with complex 3, the emission wavelengths of complexes 1 and 2 had a significant blue shift. Different from traditional cognition, the methoxyl group represents an electron-withdrawing group.
- iridium(Ⅲ) complexes,
- phosphorescent materials,
- phenylquinoline,
- electron-withdrawing group,
- photophysical properties
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