Manipulating excited-state dynamics through macrocycle positioning in a rotaxane for sensitive and discriminative methanol sensing.

Yu Wang, Yalei Ma, Ruijuan Wen, Jing Li, Taihong Liu, Liping Ding, Rong Miao, Yu Fang

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Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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8 authors.

Yu WangKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.

Yalei MaKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.

Ruijuan WenKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.

Jing LiKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.

Taihong LiuKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.ORCID https://orcid.org/0000-0002-9600-1045

Liping DingKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.ORCID https://orcid.org/0000-0002-1010-6066

Rong MiaoKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.ORCID https://orcid.org/0000-0001-5030-668X

Yu FangKey Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Provincial Key Laboratory of New Concept Sensors and Molecular Materials, School of Chemistry and Chemical Engineering, Shaanxi Normal University Xi'an 710119 P. R. China miaorong2015@snnu.edu.cn.ORCID https://orcid.org/0000-0001-8490-8080

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Precise control of excited-state dynamics is essential for advancing molecular materials. Herein, we present a supramolecular strategy utilizing mechanical interlocking to regulate photophysical pathways and molecular recognition. Three rotaxanes were synthesized by positioning a dibenzo-24-crown-8 macrocycle at specific sites along a naphthalimide-based axle. Femtosecond transient absorption spectroscopy revealed that the relaxation of the excited-state is critically governed by the spatial separation: the closer the macrocycle to the fluorophore, the slower the twisted intramolecular charge transfer process. Single-crystals of the rotaxane showed a lamellar architecture, where the macrocycle acts as a pre-organized gatekeeper for the fluorophore. Therefore, highly sensitive and selective detection of methanol vapor is realized based on the rotaxane film. In addition, a portable sensor for reliable (limit of detection: 0.099% vol.), rapid (<3 s), and reusable methanol detection in adulterated beverages is achieved. Our work establishes mechanical interlocking as a versatile approach to excited-state manipulating and sensor design.

Identifiers

PMID42131361

DOI10.1039/d6sc00753h

PMCPMC13163210

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