Multi-stimuli responsive fluorescent materials have vast applications in the field of chemistry, physics and material science. Among the multifunctional materials, ESIPT-active materials have drawn prodigious attraction in recent years due to their large Stokes shifted emission and dual emissive behavior. Herein, we report a novel “all-in-one” type fluorescent 7-diethylamino-4-hydroxycoumarin-rhodamine B conjugate (DHCRH) which shows aggregation induced emission, acidochromism, and mechanochromic luminescent features along with unique methanol responsiveness. An information protection application was executed via a write-erase-write fluorescent platform using the acidochromic feature of DHCRH. Furthermore, the DHCRH-Zn ensemble was found to exhibit reversible photochromic behavior from a yellow to pink color in the solution state upon irradiation with 365 nm UV light through an intramolecular ring opening and closing mechanism. The complex provided a long lifetime for the ring-opened form and good fatigue resistance for reversible photochromism.

中文翻译：

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多合一型 ESIPT 活性多刺激响应 7-二乙氨基-4-羟基香豆素-罗丹明 B 腙作为分子开关及其锌集合的可逆光致变色特征

多刺激响应荧光材料在化学、物理和材料科学领域有着广泛的应用。在多功能材料中，ESIPT 活性材料由于其大的斯托克斯位移发射和双发射行为近年来引起了极大的关注。在此，我们报告了一种新型的“一体式”荧光 7-二乙氨基-4-羟基香豆素-罗丹明 B 共轭物 ( DHCRH )，它显示出聚集诱导发射、酸致变色和机械致变色发光特征以及独特的甲醇响应性。使用 DHCRH 的酸致变色特性，通过写-擦除-写荧光平台执行信息保护应用程序。此外，DHCRH-Zn通过分子内环开闭机制，在用 365 nm 紫外光照射后，发现整体表现出从溶液状态从黄色到粉红色的可逆光致变色行为。该配合物为开环形式提供了长寿命，并为可逆光致变色提供了良好的抗疲劳性。