In-Situ Photochromism Switching with Crystal Jumping through the Deammoniation of N-Salicylideneaniline Ammonium Salt.
In-Situ Photochromism Switching with Crystal Jumping through the Deammoniation of N-Salicylideneaniline Ammonium Salt.
复制标题
通过 N-水杨基苯胺铵盐脱氨实现晶体跳跃的原位光致变色切换。
DOI：
10.1021/acs.cgd.9b00039
复制
发表时间：
2019
影响因子：
3.8
通讯作者：
H. Uekusa
中科院分区：
文献类型：
--
作者：
H. Sugiyama;K. Johmoto;A. Sekine;H. Uekusa
N-水杨基苯胺（SA）衍生物是传统的有机光致变色化合物，其性能与其分子构象和晶体结构密切相关。我们在此提出了使用脱氨反应的 SA 铵盐晶体的光致变色性能切换现象。发现N-水杨基-4-羧基苯胺铵盐晶体(1-Sα)在紫外光照射下表现出光致变色现象。加热时1-Sα脱附氨气并转变成具有非光致变色性质的非离子SA晶体(1-N)。令人惊讶的是，这种相变引发了“跳晶”现象。由此，确定了相变前后的晶体结构，并揭示了光致变色的转换现象（光致变色转换）是由脱氨时发生的晶体结构和分子构象的变化引起的。此外，通过暴露于氨水蒸气几分钟，1-N恢复为1-Sα。这些结果表明这种SA晶体可用作开关材料或化学传感器。
N-Salicylideneaniline (SA) derivatives are traditional organic photochromic compounds whose properties are closely related to their molecular conformations and crystal structures. We herein present the photochromic property switching phenomenon of SA ammonium salt crystals using a deammoniation reaction. TheN-salicylidene-4-carboxyaniline ammonium salt crystal (1-Sα) was found to exhibit photochromism upon irradiation with UV light. Upon heating,1-Sαdesorbed ammonia gas and transformed into a nonionic SA crystal (1-N) with non-photochromic properties. Surprisingly, this phase transition induced the “jumping crystal” phenomenon. Thus, the crystal structures both before and after the phase transition were determined, and it was revealed that the switching phenomenon of photochromism (photochromism switching) was caused by the crystal structural and molecular conformational changes that took place upon deammoniation. In addition,1-Nreverted to1-Sαby exposure to aqua-ammonia vapor for a few minutes. These results suggested that such SA crystals could be applicable as switching materials or chemical sensors.