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首页> 外文期刊>CrystEngComm >Reversible on/off switching of photochromic properties in N-salicylideneaniline co-crystals by heating and humidification
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Reversible on/off switching of photochromic properties in N-salicylideneaniline co-crystals by heating and humidification

机译：通过加热和加湿，可逆开/关在N-水杨酰胺的共晶中光致变色性能切换

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摘要

N-Salicylideneaniline (SA) and its derivatives are known to exhibit photochromism, which is a reversible colour change induced by photo irradiation. Therefore, we performed on/off switching of the photochromic properties of an SA crystal by the hydration-dehydration phase transition. The photochromic properties of SA crystals are closely related to their crystal structures and molecular conformations. A monohydrated co-crystal (1H) of SA derivatives did not exhibit photochromism upon UV light irradiation. However, upon heating, 1H transformed to the anhydrous form 1A, which exhibited photochromism. Moreover, 1A rehydrated to 1H under high humidity conditions, and the photochromic properties were switched off. Thus, the photochromic properties were reversibly switched on/off through the hydration-dehydration phase transition. X-ray crystal structural analyses revealed that the molecules adopted a planar (non-photochromic) conformation in 1H, but after dehydration, they changed to a non-planar (photochromic) conformation in 1A due to large crystal structure changes. Therefore, on/off switching of photochromism was clearly explained by the SA molecular conformation change. Additionally, proton transfer between SA and the co-former molecule was observed along with structural changes resulting from dehydration and hydration. This is the first report to switch the photochromic properties of SA crystals and explain the switching mechanism based on the crystal structure comparison. We intend to emphasize that the photochromism switching phenomena by external stimuli, namely heat and humidity, pave the way for utilizing these crystals in "smart materials".
机译：已知N-水杨酰胺（SA）及其衍生物表现出光致变色，这是由光辐射引起的可逆颜色变化。因此，我们通过水化脱水相转变进行SA晶体的光致变色性能的开/关。 SA晶体的光致变色特性与其晶体结构和分子构象密切相关。 SA衍生物的一水合晶晶（1H）在UV光照射时没有表现出光学变调程。然而，在加热时，将1小时转化为无水形式1a，其表现出光致变色。此外，在高湿度条件下再水化至1H的1A，并关闭光致变色特性。因此，通过水化脱水相转变转动光致变色性能接通/断开。 X射线晶体结构分析显示，分子在1H中采用平面（非光致变色）构象，但在脱水之后，由于大的晶体结构变化，它们在1A中变为非平面（光致变色）构象。因此，通过SA分子构象变化清楚地解释了光学变色的开/关切换。另外，在脱水和水合产生的结构变化之后，观察到SA和共端分子之间的质子转移。这是第一个切换SA晶体的光致变色特性的报告，并解释基于晶体结构比较的开关机构。我们打算强调，通过外部刺激，即热和湿度，铺平了利用这些晶体在“智能材料”中的方式。

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  • 来源
    《CrystEngComm》 |2019年第20期|共6页
  • 作者

    Sugiyama Haruki; Johmoto Kohei; Sekine Akiko; Uekusa Hidehiro;

  • 作者单位

    Keio Univ Res &

    Educ Ctr Nat Sci Kohoku Ku Hiyoshi 4-1-1 Yokohama Kanagawa 2238521 Japan;

    Tokyo Inst Technol Grad Sch Sci Dept Chem Meguro Ku 2-12-1 Ookayama Tokyo 1528551 Japan;

    Tokyo Inst Technol Grad Sch Sci Dept Chem Meguro Ku 2-12-1 Ookayama Tokyo 1528551 Japan;

    Tokyo Inst Technol Grad Sch Sci Dept Chem Meguro Ku 2-12-1 Ookayama Tokyo 1528551 Japan;

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  • 正文语种 eng
  • 中图分类 化学工业;晶体学;
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