Intramolecular Charge Transfer-Regulated Isomeric Covalent Organic Frameworks for Multiple Solvent-Response

IF 12.1 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Small Pub Date : 2025-03-25 DOI:10.1002/smll.202501139

Ke Shi, Yaze Chen, Haijiao Peng, Yuhao Liu, Chao Lu

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Abstract

Stimulus-responsive covalent organic frameworks (COFs) own color-switching characteristics when exposed to external stimuli. However, the investigations on the multiple solvent-responsive COFs remain a challenge due to the synthetic difficulties and uncontrollable charge transfer process toward various solvents. In this contribution, two novel isomeric COFs with a regulated intramolecular charge transfer (ICT) process by modulating the distance between the donor/acceptor and the linkage are synthesized. The as-prepared two isomeric COFs exhibited significantly distinct solvatochromic behaviors in water, acid, and halogenated solvents, respectively. These multiple solvent-responsive functions are attributed to the various enhancement degrees of the ICT process by the hydrogen bond interactions, protonation interactions, and halogen/π interactions, respectively. In addition, the two isomeric COFs are employed as stimulation-responsive powder or ink, displaying excellent image and data encryption performances. The work can not only offer a novel viewpoint for the creation of multiple solvent-responsive COFs but also expand the COFs' potential applications in information encryption and anti-counterfeiting.

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分子内电荷转移调控的多溶剂反应异构共价有机框架

刺激反应共价有机框架（COFs）在受到外界刺激时具有颜色转换特性。然而，由于合成困难和向各种溶剂的电荷转移过程不可控，对多溶剂响应型COFs的研究仍然是一个挑战。本文合成了两种新型的异构体COFs，它们通过调节供体/受体与键之间的距离来调节分子内电荷转移（ICT）过程。制备的两种异构体COFs分别在水、酸和卤化溶剂中表现出明显不同的溶剂致变色行为。这些多重溶剂响应功能分别归因于氢键相互作用、质子化相互作用和卤素/π相互作用对ICT过程的不同程度的增强。此外，这两种异构体COFs被用作刺激响应粉末或墨水，具有优异的图像和数据加密性能。该研究不仅为制备多溶剂响应型COFs提供了新的思路，而且拓展了COFs在信息加密和防伪方面的潜在应用。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.