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Cucurbit[7]Uril-Based Self-Assembled Supramolecular Complex with Reversible Multistimuli-Responsive Chromic Behavior and Controllable Fluorescence

Wang, Xiao Feng; Lin, Rui Lian; Sun, Wen Qi; Liu, Jing Xin; Xu, Li Xin; Redshaw, Carl; Feng, Xing

Authors

Xiao Feng Wang

Rui Lian Lin

Wen Qi Sun

Jing Xin Liu

Li Xin Xu

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Xing Feng



Abstract

Multistimuli-responsive color-changing materials have potential applications in areas such as chemical sensing and anti-counterfeiting. In this work, a fluoro-phenyl-acetyl-substituted viologen derivative (FPAV·Cl2) is synthesized, which can form a supramolecular inclusion complex with cucurbit[7]uril (Q[7]) via self-assembly. Significantly, the resulting inclusion complex FPAV2+@Q[7] in the solid-state exhibits visual color changes in response to multiple external stimuli including light, heat, and vapors of ammonia and organic amines. The electron spin resonance (ESR) and ultraviolet–visible (UV–vis) spectra analysis reveals that the photochromic, thermochromic, and vapochromic behavior of FPAV2+@Q[7] is due to the generation of FPAV+• free radicals resulting from electron transfer. Furthermore, in the solid-state, FPAV2+@Q[7] shows controllable fluorescence regulated by its chromic process. Based on the multi stimuli-responsive color-changes and fluorescence properties of FPAV2+@Q[7], its practical applications in erasable inkless printing, multiple anti-counterfeiting processes, visible ammonia/organic amines detection, and information encryption are demonstrated. The supramolecular strategy of encapsulating viologen derivatives into macrocycles provides a general method for fabricating multi stimuli-responsive chromic materials with multiple practical applications.

Citation

Wang, X. F., Lin, R. L., Sun, W. Q., Liu, J. X., Xu, L. X., Redshaw, C., & Feng, X. (in press). Cucurbit[7]Uril-Based Self-Assembled Supramolecular Complex with Reversible Multistimuli-Responsive Chromic Behavior and Controllable Fluorescence. Advanced Optical Materials, Article 2400839. https://doi.org/10.1002/adom.202400839

Journal Article Type Article
Acceptance Date Jun 1, 2024
Online Publication Date Jun 4, 2024
Deposit Date Jun 19, 2024
Publicly Available Date Jun 5, 2025
Print ISSN 2195-1071
Electronic ISSN 2195-1071
Publisher Wiley
Peer Reviewed Peer Reviewed
Article Number 2400839
DOI https://doi.org/10.1002/adom.202400839
Public URL https://hull-repository.worktribe.com/output/4710463