Synthesis, Photochromic Properties, and Crystal Structures of Salts Containing a Pyridinium-Fused Spiropyran: Positive and Negative Photochromism in the Solution and Solid State.,The Journal of Physical Chemistry B

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Synthesis, Photochromic Properties, and Crystal Structures of Salts Containing a Pyridinium-Fused Spiropyran: Positive and Negative Photochromism in the Solution and Solid State.
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-07-22 , DOI: 10.1021/acs.jpcb.0c04994
Yusuke Funasako ₁ , Haruka Miyazaki ₁ , Takuro Sasaki ₁ , Kenta Goshima ₁ , Makoto Inokuchi ₁

Affiliation

Salts containing the merocyanine form of a pyridinium-fused spiropyran ([6′-MC]X; X = I and PF₆) were prepared, and their crystal structures were determined. In addition, the photochromic properties of the salts were spectroscopically and kinetically investigated. In the solution state, the salts exhibited negative photochromism. Theoretical calculations revealed that the negative photochromism of the salt originates from the drastic stabilization of the merocyanine structure by electron delocalization of the pyridinium ring. Furthermore, the salts containing the merocyanine and spiropyran forms ([6′-MC]I, [6′-MC]PF₆, and [6′-SP]PF₆) were obtained by recrystallization. The crystals of [6′-SP]PF₆ exhibited positive photochromism in the solid state; however, no photochromism was observed in the [6′-MC]X crystals.

中文翻译：

含吡啶鎓吡咯烷的盐的合成，光致变色性质和晶体结构：溶液和固态中的正负光致变色现象。

制备了含有花青素形式的吡啶鎓稠合螺吡喃盐的盐（[ 6'-MC ] X； X = I和PF ₆），并确定了它们的晶体结构。另外，通过光谱和动力学研究了盐的光致变色性质。在溶液状态下，盐表现出负的光致变色。理论计算表明，该盐的负光致变色现象是由于吡啶环的电子离域作用而使花菁结构急剧稳定所致。此外，含有部花青和螺吡喃的盐形式为[[ 6'-MC ] I，[ 6'-MC ] PF ₆和[ 6'-SP ] PF ₆通过重结晶获得）。[ 6'-SP ] PF ₆晶体在固态下显示正光致变色；但是，在[ 6'-MC ] X晶体中未观察到光致变色现象。

更新日期：2020-08-20

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