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Time-Dependent Solvent-Driven Solid-State Fluorescence-based Numeric Coding
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DOI：10.1021/jacs.3c03727.png)
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Abstract
En 中文
Controllablesolid-state transformations can provide a basis fornovel functional materials. Herein, we report a series of solid-statesystems that can be readily transformed between amorphous, co-crystalline,and mixed crystalline states via grinding or exposure to solvent vapors.The present solid materials were constructed using an all-hydrocarbonmacrocycle, cyclo[8](1,3-(4,6-dimethyl)benzene) ( D ( 4d ) -CDMB-8) (host), andneutral aggregation-caused quenching dyes (guests), including 9,10-dibromoanthracene(1), 1,8-naphtholactam (2), diisobutyl perylene-3,9-dicarboxylate(3), 4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (4), 4,7-di(2-thienyl)-benzo[2,1,3]thiadiazole(5), and 4-imino-3-(pyridin-2-yl)-4H-quinolizine-1-carbonitrile (6). Seven co-crystals andsix amorphous materials were obtained via host-guest complexation.Most of these materials displayed turn-on fluorescence emission (upto 20-fold enhancement relative to the corresponding solid-state guests).The interconversion between amorphous, co-crystalline states, andcrystalline mixtures could be induced by exposure to solvent vaporsor by subjecting to grinding. The transformations could be monitoredreadily by means of single-crystal and powder X-ray diffraction analyses,as well as solid-state fluorescent emission spectroscopy. The externallyinduced structural interconversions resulted in time-dependent fluorescencechanges. This allowed sets of privileged number array codes to begenerated.
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15.6
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20.0W
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60.2W