Fabrication of efficient and red-emissive salicylaldehyde Schiff base isomers toward multi-scenario information decryption

Abstract

Due to the board applications in information technology, biochemical sensors, and optoelectronic devices, stimuli-responsive fluorescent materials (SRFMs) have gained significant attention. With simple synthesis and modification, Schiff bases are considered promising candidates for SRFMs. However, realizing highly efficient luminescence with aggregation-induced emission (AIE) properties as well as stimuli responses is still challenging due to the lack of clear structure-property relationships. In this work, a general strategy for constructing efficient and red-emissive salicylaldehyde Schiff bases is proposed utilizing the triphenylamine (TPA) substitution strategy. Experimental results and theoretical calculation illustrate that all four isomers show typical AIE effect of the keto-form emission upon photoexcitation and red fluorescence due to the charge-transfer transition from the TPA on the salicylaldehyde unit to the keto unit. The single-crystal structure also demonstrates the introduction of dual TPA appropriately provides proper intermolecular interactions, resulting in high-intensity fluorescence. Moreover, with excellent acidichromic properties under both daylight and UV light conditions, p,p-2TPA is successfully applied in steganography and multi-scenario information decryption. This work not only realizes the efficient and red-color luminescence from the simple salicylaldehyde Schiff base skeleton but also provides a strategy for constructing SRFMs with AIE properties.

Supplementary files

Article information

Article type
Paper
Submitted
30 Mar 2024
Accepted
12 Jun 2024
First published
13 Jun 2024

J. Mater. Chem. C, 2024, Accepted Manuscript

Fabrication of efficient and red-emissive salicylaldehyde Schiff base isomers toward multi-scenario information decryption

W. Zhong, Y. Wu, Y. Lin, S. Li, J. Zhang and X. Cai, J. Mater. Chem. C, 2024, Accepted Manuscript , DOI: 10.1039/D4TC01287A

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