Precise Modulation of Intramolecular Aggregation‐induced Electrochemiluminescence by Tetraphenylethylene‐based Supramolecular Architectures

Author:

Zhu Zhentong1,Zeng Chaoqin1,Zhao Yaqi1,Ma Jianjun2,Yao Xiaoqiang1,Huo Shuhui1,Feng Yanjun1,Wang Ming2ORCID,Lu Xiaoquan1ORCID

Affiliation:

1. Key Laboratory of Water Security and Water Environment Protection in Plateau Intersection (NWNU) Ministry of Education College of Chemistry and Chemical Engineering Northwest Normal University 730070 Lanzhou Gansu People's Republic of China

2. State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University 130012 Changchun Jilin People's Republic of China

Abstract

AbstractThe precisely modulated synthesis of programmable light‐emitting materials remains a challenge. To address this challenge, we construct four tetraphenylethylene‐based supramolecular architectures (SA, SB, SC, and SD), revealing that they exhibit higher electrochemiluminescence (ECL) intensities and efficiencies than the tetraphenylethylene monomer and can be classified as highly efficient and precisely modulated intramolecular aggregation–induced electrochemiluminescence (PI‐AIECL) systems. The best‐performing system (SD) shows a high ECL cathodic efficiency exceeding that of the benchmark tris(2,2′‐bipyridyl)ruthenium(II) chloride in aqueous solution by nearly six‐fold. The electrochemical characterization of these architectures in an organic solvent provides deeper mechanistic insights, revealing that SD features the lowest electrochemical band gap. Density functional theory calculations indicate that the band gap of the guest ligand in the SD structure is the smallest and most closely matched to that of the host scaffold. Finally, the SD system is used to realize ECL‐based cysteine detection (detection limit=14.4 nM) in real samples. Thus, this study not only provides a precisely modulated supramolecular strategy allowing chromophores to be controllably regulated on a molecular scale, but also inspires the programmable synthesis of high‐performance aggregation‐induced electrochemiluminescence emitters.

Funder

National Natural Science Foundation of China

Science Fund for Distinguished Young Scholars of Gansu Province

Publisher

Wiley

Subject

General Chemistry,Catalysis

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