We report the synthesis and photoluminescence (PL) behavior of a new molecular system, which is composed of three positional isomers. They exhibit isomeric effects on both aggregation-induced emission (AIE) and intramolecular charge transfer (ICT) mechanisms. Furthermore, one of them, i.e., (E)-5-methoxy-2-(((6-methylbenzo [d]thiazol-2- yl)imino)methyl)phenol (MTP3), shows unique mechanochromic fluorescence (MCF) phenomenon. Unlike most MCF materials that would function immediately after applying mechanical force, the MCF character of this material is however recessive with mechanical force, but becomes visible upon fumigation treatment. Given that the MCF is activated under specific conditions, it is termed as conditional mechanochromic fluorescence (CMCF) in this study. In light of the CMCF property of MTP3, a new data encryption-decryption technique was developed. Binary data and complex patterns can be recorded by mechanical force and concealed on the tailor-made data storage. The encoded data cannot be read unless it is fumed by organic vapour, demonstrating a successful encryption-decryption technique. The CMCF offers great potential to be the alternative to encryption algorithms and may contribute greatly to data security and cybercrime prevention.

我们报告了由三个位置异构体组成的新分子系统的合成和光致发光（PL）行为。它们对聚集体诱导发射（AIE）和分子内电荷转移（ICT）机制均表现出异构作用。此外，其中之一，即（E）-5-甲氧基-2-（（（（6-甲基苯并[d]噻唑-2-基]亚氨基]亚氨基）甲基]苯酚（MTP3））表现出独特的机械变色荧光（MCF）现象。与大多数在施加机械力后立即起作用的MCF材料不同，该材料的MCF特性在机械力作用下是隐性的，但在熏蒸处理后可见。鉴于MCF在特定条件下被激活，在本研究中将其称为条件性机械变色荧光（CMCF）。根据MTP3的CMCF属性，开发了一种新的数据加密/解密技术。二进制数据和复杂模式可以通过机械力进行记录，并隐藏在量身定制的数据存储中。除非经过有机蒸气熏制，否则无法读取编码后的数据，这表明加密和解密技术是成功的。