Citation: RUI Kai, WU Shi-Shan, CAO Deng-Ke. Benzoimidazole-Based Cyclometalated Ir(Ⅲ) Complexes: Syntheses, Structures and Luminescence Modulation/Switching[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(8): 1340-1348. doi: 10.11862/CJIC.2019.156 shu

Benzoimidazole-Based Cyclometalated Ir(Ⅲ) Complexes: Syntheses, Structures and Luminescence Modulation/Switching

School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Corresponding author: CAO Deng-Ke, dkcao@nju.edu.cn
Received Date: 4 April 2019
Revised Date: 26 April 2019

Figures(9)

Two iridium complexes[Ir(ppy)(qbiH)]NO₃ (1·NO₃) and[Ir(ppy)(qbi)] (2) have been synthesized. Their crystal structures indicate that an[Ir(ppy)₂]⁺ unit is chelated by a neutral benzoimidazole-based ligand qbiH in 1·NO₃, while anion ligand qbi^- in 2. The different deprotonation degrees of ligands qbiH and qbi^- in the two complexes lead to their clear differences in luminescence both in solution and in solid state. Complexes 1·NO₃ and 2 in CH₂Cl₂ show the emissions at 581 and 574 nm, respectively. In solid state, a red emission at 611 nm was observed for 1·NO₃, while an orange emission at 598 nm for 2. It is interesting that both 1·NO₃ and 2 in solid state exhibited luminescence switching between red emission and orange emission, upon meeting Et₃N/TFA vapor. This is due to the acid/base-induced structural interconversion between ligand qbiH and ligand qbi^- in complexes 1·NO₃ and 2. Moreover, we discuss the relationship between structure and luminescence for 1·NO₃ and 2.
- iridium complex,
- crystal structure,
- luminescence modulation/switching
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