π-Conjugation Enhanced Crown Ether Charge-Transfer Cocrystals for Near-Infrared Photothermal Conversion
Weijie Zhu , Yujuan Zhou , Bohan Zhao , Xiaolong Deng , Errui Li , Ning Liu , Kecheng Jie
Chinese Journal of Chemistry ›› 2025, Vol. 43 ›› Issue (23) : 3125 -3132.
Modulating the photophysical of organic solid-state functional materials is crucial for advancing supramolecular chemistry and materials science. Here, we present a π-conjugation enhanced charge-transfer strategy to turn on the photothermal conversion properties of crown ether cocrystals. Three crown ethers (H1, H2, and H3) bearing different π-conjugated moieties are synthesized, exhibiting enhanced solid-state luminescence upon increasing molecular conjugation. In addition, three sets of host–guest cocrystals are constructed via charge-transfer (CT) interactions between these electron-rich crown ethers and electron-deficient 1,2,4,5-tetracyanobenzene (TCNB). Based on the variations in CT interactions, the resulting cocrystals transform from primarily photoluminescent behavior to efficient photothermal conversion. Detailed structural and spectroscopic analyses reveal that the extent of π-donor/π-acceptor overlap within the cocrystals is the dominant factor governing their tunable photophysical properties.
Crown ethers / Organic cocrystals / Charge transfer / Photothermal conversion / Solid state luminescence / Host–guest systems / Supramolecular chemistry / Macrocycles
2025 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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