Citation: Weilin Song, Huiting Mao, Ying Gao, Yaxuan Yao, Guo-Gang Shan, Zhongmin Su. Understanding AIE and ACQ phenomenon of organometallic iridium(Ⅲ) complexes by simple cationization engineering[J]. Chinese Chemical Letters, ;2024, 35(2): 108309. doi: 10.1016/j.cclet.2023.108309 shu

Understanding AIE and ACQ phenomenon of organometallic iridium(Ⅲ) complexes by simple cationization engineering

Weilin Song ^{a, 1} ,
Huiting Mao ^{a, d, 1} ,
Ying Gao ^{b, *,} ,
Yaxuan Yao ^c ,
Guo-Gang Shan ^{c, *,} ,
Zhongmin Su ^{a, *,}

a.
State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130021, China
b.
Jilin Provincial Key Laboratory of Straw Based Functional Materials, Institute for Interdisciplinary Biomass Functional Materials Studies, Jilin Engineering Normal University, Changchun 130052, China
c.
Institute of Functional Material Chemistry and National & Local United Engineering Lab for Power Battery, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
d.
College of Life Science, Dalian Minzu University, Dalian 116600, China

gaoy029@163.com

shangg187@nenu.edu.cn

zmsu@nenu.edu.cn

Received Date: 13 January 2023
Revised Date: 23 February 2023
Accepted Date: 6 March 2023
Available Online: 1 June 2023

Figures(5)

Understanding the relationship between structure and properties is critical to the development of solid-state luminescence materials with desired characteristics and performance optimization. In this work, we elaborately designed and synthesized a pair of mononuclear iridium(Ⅲ) complexes with similar structures but different degrees of cationization. [Ir2-f][2PF₆] with two counterions is obtained by simple N-methylation of the ancillary ligand of [Ir1-f][PF₆] which is a classic cationic iridium(Ⅲ) complex. Such a tiny modification results in tremendously different optical properties in dilute solutions and powders. [Ir1-f][PF₆] exhibits weak light in solution but enhanced emission in solid-state as well as poly(methyl methacrylate) matrix, indicative of its aggregation-induced emission (AIE) activity. On the sharp contrary, [Ir2-f][2PF₆] is an aggregation-caused quenching (ACQ) emitter showing strong emission in the isolated state but nearly nonemissive in aggregation states. Benefiting from the appealing characteristics of mechanochromic luminescence and AIE behavior, [Ir1-f][PF₆] has been successfully applied in reversible re-writable data recording and cell imaging. These results might provide deep insights into AIE and ACQ phenomenon of iridium(Ⅲ) complexes and facilitate the development of phosphorescent materials with promising properties.
- Aggregation induced-emission,
- Cationic iridium(Ⅲ) complex,
- Counterion,
- Mechanochromic luminescence,
- Cell imaging
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