Trace Ir(Ⅲ) complex enhanced electrochemiluminescence of AIE-active Pdots in aqueous media

作者：Hang Gao; Nan Zhang; Yang Li; Wei Zhao^*; Yiwu Quan^*; Yixiang Cheng; Hong-Yuan Chen; Jing-Juan Xu

来源：Science China Chemistry, 2020, 63(05): 715-721.

Trace Ir(Ⅲ) complex enhanced aggregation-induced electrochemiluminescence(AIECL) of poly-tetraphenylethene(p TPE) in aqueous media was investigated for the first time. The poly-TPE end-capped by Ir(Ⅲ) complex(Ir@p TPE) and its corresponding model polymer poly-TPE(Ph@pTPE) could be synthesized by Suzuki coupling polymerization reaction of 1,2-bis(4-bromophenyl)-1,2-diphenylethene(M-1) with 1,2-diphenyl-1,2-bis(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethene(M-2) and the continuous Suzuki coupling end-capped reaction of poly-TPE-pinacol boronate with(pq)2 Ir(pico)Br and bromobenzene, respectively. Subsequently, the corresponding Ir@p TPE Pdots and Ph@p TPE Pdots encapsulated with poly(styrene-co-maleicanhydride)(PSMA) could be obtained by nanoprecipitation method. Compared with Ph@p TPE Pdots, the Ir@p TPE Pdots with a trace amount of Ir(Ⅲ) complex(1.34‰ of Ir(Ⅲ) content, wt) could exhibit 9.9-fold enhancement of the electrochemiluminescence(ECL) signal for visual emission. This work provided a novel strategy on designing highly efficient ECL materials based on trace Ir(Ⅲ)-end capping AIE-active polymer dots.

• 单位
  南京大学; 生命分析化学国家重点实验室