Journal
MATERIALS HORIZONS
Volume 7, Issue 6, Pages 1566-1572Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0mh00447b
Keywords
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Funding
- National Natural Science Foundation of China [21788102, 61735016, 61975172]
- Research Grants Council of Hong Kong [16308016, C6009-17G]
- Innovation and Technology Commission [ITC-CNERC14SC01]
- Science and Technology Plan of Shenzhen [JCYJ20160229205601482, JCYJ20180507183832744]
- National Science Foundation of China [51773076]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [SKLSSM2019019]
- Graduate Innovation Fund of Jilin University
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In situ photo-irradiation of trans-2-(4-fluorostyryl)benzo[d]oxazole (t-FSBO) and trans-2-(2,4-difluorostyryl)benzo[d]oxazole (t-2FSBO) with aggregation-caused quenching (ACQ) characteristics in the solid-state afforded unprecedented aggregation-induced emission (AIE) luminogens through [2+2] cycloaddition. Although the photoreaction products were weakly conjugated, they were emissive. Interestingly, the product cisoid-2,2 '-(3,4-bis(2,4-fluorophenyl)cyclobutene-1,2-diyl)bis(benzo[d]oxazole) (c-2FPCBO) could form blue and yellow emissive crystals due to the different packing modes. Crystallographic results and computational calculation suggested that this anomalous phenomenon was attributed to intramolecular and intermolecular through-space conjugation. To the best of our knowledge, this is the first reported in situ ACQ-to-AIE transformation achieved by UV irradiation, deepening the understanding that non-conjugated molecules can be emissive. In addition to this novel and accessible ACQ-to-AIE transformation, the photosalient effect was also observed during the reactions. Notably, a macroscopic actuator was achieved by simply coating t-FSBO on a nitrile butadiene glove, which could bend over 70 degrees towards UV light source. This system thus offers a new class of AIE luminogens with a living character.
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