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

作　　者：Weilin Song Huiting Mao Ying Gao Yaxuan Yao Guo-Gang Shan Zhongmin Su 

机构地区：[1]State Key Laboratory of Supramolecular Structure and Materials,Institute of Theoretical Chemistry,College of Chemistry,Jilin University,Changchun 130021,China [2]Jilin Provincial Key Laboratory of Straw Based Functional Materials,Institute for Interdisciplinary Biomass Functional Materials Studies,Jilin Engineering Normal University,Changchun 130052,China [3]Institute of Functional Material Chemistry and National & Local United Engineering Lab for Power Battery,Faculty of Chemistry,Northeast Normal University,Changchun 130024,China [4]College of Life Science,Dalian Minzu University,Dalian 116600,China

出　　处：《Chinese Chemical Letters》2024年第2期553-557,共5页中国化学快报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.22175033 and 51902124).

摘　　要：Understanding the relationship between structure and properties is critical to the development of solidstate 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][2PF_(6)] with two counterions is obtained by simple Nmethylation of the ancillary ligand of [Ir1-f][PF_(6)] 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][PF_(6)] 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][2PF_(6)] 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][PF_(6)] 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.

关 键 词：Aggregation induced-emission Cationic iridium(III)complex COUNTERION Mechanochromic luminescence Cell imaging 

分 类 号：TB34[一般工业技术—材料科学与工程] O641.4[理学—物理化学]