Acid/Base and Guest Controlled Delayed Fluorescence and Its Application in Logic Gate

doi:10.7503/cjcu20250382

Chem. J. Chinese Universities

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Acid/Base and Guest Controlled Delayed Fluorescence and Its Application in Logic Gate

SONG Kuizhu¹，LONG Yujie^1,2，WANG Yaru¹，WANG Jiaqi^1,2，LU Haiyan¹，CHEN Chuanfeng^1,2

1. University of Chinese Academy of Sciences 2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences

Received:2025-12-16 Revised:2026-02-24 Online:2026-03-10 Published:2026-03-10
Contact: Chuan-Feng Chen E-mail:cchen@iccas.ac.cn
Supported by:
Supported by the National Natural Science Foundation of China (Nos.22371277, 22031010, 22171272) and the Strategic Priority Research Program of the Chinese Academy of Sciences, China (No.XDB0520302)

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Abstract

Abstract: A delayed fluorescence system regulating the space charge transfer (TSCT) pathway via host-guest interactions and acid-base stimulation is proposed. Within the macrocyclic molecule C[3]A-1，an intramolecular TSCT pathway forms between the 3-cyanopyridine acceptor in the cavity and the macrocyclic donor，generating green thermally activated delayed fluorescence (TADF) emission. Upon introduction of the guest 2-cyanopyrazine (2-CP)，host-guest assembly induces a conformational change in the receptor，shutting down the intramolecular TSCT pathway. Simultaneously，a new intermolecular TSCT pathway is established between the guest and the macrocycle sidewall, leading to yellow TADF emission and enabling reversible switching of delayed fluorescence，Furthermore，protonation/deprotonation at the receptor's nitrogen site confers acid-base responsiveness，enabling reversible switching of luminescence. Leveraging these multi-stimulus-responsive properties，a multi-level molecular logic gate was successfully constructed, offering novel insights for designing tunable delayed-fluorescence materials.

Key words: Host-guest interaction, TSCT, Stimulus response, TADF, Calix[3]acridans

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SONG Kuizhu, LONG Yujie, WANG Yaru, WANG Jiaqi, LU Haiyan, CHEN Chuanfeng. Acid/Base and Guest Controlled Delayed Fluorescence and Its Application in Logic Gate[J]. Chem. J. Chinese Universities, doi: 10.7503/cjcu20250382.

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Acid/Base and Guest Controlled Delayed Fluorescence and Its Application in Logic Gate

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