A simple AIE-active salicylideneaniline towards bimodal encryption-decryption with unique ESIPT-inhibited amorphous state
[Display omitted] •Bulky TPA is favorable for photochromism in the crystalline state.•Bulky TPA can help to form amorphous materials during fast precipitation procedure.•Excited-state intramolecular proton transfer is inhibited in the amorphous state for inactive photochromism.•Distinguished photoch...
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Veröffentlicht in: | Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-06, Vol.466, p.143353, Article 143353 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | [Display omitted]
•Bulky TPA is favorable for photochromism in the crystalline state.•Bulky TPA can help to form amorphous materials during fast precipitation procedure.•Excited-state intramolecular proton transfer is inhibited in the amorphous state for inactive photochromism.•Distinguished photochromism is utilized for bimodal encryption-decryption.
Multimodal encryption-decryption with photochromism has been proved to ensure information security with great feasibility and operability. However, most of the photochromic materials are applied in single-mode encryption-decryption and highly dependent on crystallization, requiring long manufacturing time and lacking of controllability. Hence, amorphous materials with simple preparation and bimodal encryption-decryption are of good alternates. Herein, we have succeeded in developing an aggregation-induced emission-active and photochromic ATPA-SAB with crystalline form via introduction of the propeller-like and bulky triphenylamine (TPA). Expectedly, the amorphous materials can be obtained by fast precipitation. Examining its amorphous structures, the intramolecular N‧‧‧H distances of around 4.000 Å is largely over the normal intramolecular hydrogen bond of circa 1.800 Å, impeding the intrinsic excited-state intramolecular proton transfer process (ESIPT) for the first time, hence prohibiting photochromism. This work not only provides a strategy to construct amorphous materials and inhibit ESIPT process with TPA, but also applies both crystalline and amorphous materials for bimodal encryption-decryption to upgrade information security. |
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ISSN: | 1385-8947 1873-3212 |
DOI: | 10.1016/j.cej.2023.143353 |