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首页> 外文期刊>Chemistry: A European journal >Photo-, Solvent-, and Ion-Controlled Multichromism of Imidazolium-Substituted Diarylethenes
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Photo-, Solvent-, and Ion-Controlled Multichromism of Imidazolium-Substituted Diarylethenes

机译：咪唑鎓取代的二芳烃的光，溶剂和离子控制的多色性

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摘要

Cationic diarylethenes with an imidazolium ring are synthesized for the first time. The imidazolium cationic moiety is connected directly to the ethene unit as one of the aryl units that take part in the photoinduced pericyclization reaction. The imidazolium-substituted diarylethenes undergo reversible photochromic reactions in a variety of organic media, including ionic liquids, even though they have a delocalized cationic charge in one of the five-membered aromatic rings. The closed-ring isomer shows solvatochromism depending on the solvent donor numbers. Addition of some tetraalkylammonium salts, such as tetrabutyl ammonium nitrate, into the colored organic solution of diarylethene also causes a color change, indicating its ionochromic property. These solvato- and ionochromic properties are considered in connection with the shift of chemical equilibrium between the closed-ring isomers, one with an extended pi-conjugation system and one with limited pi-conjugation due to the strong interaction with solvent molecules and anions with high donor number.
机译：首次合成了具有咪唑鎓环的阳离子二芳烃。咪唑鎓阳离子部分作为参与光诱导的周环化反应的芳基单元之一直接连接至乙烯单元。咪唑鎓取代的二芳烃在包括离子液体在内的各种有机介质中都会发生可逆的光致变色反应，即使它们在五元芳环之一中具有离域的阳离子电荷也是如此。闭环异构体根据溶剂给体数显示溶剂变色现象。将一些四烷基铵盐，例如硝酸四丁基铵，添加到二芳基乙烯的有色有机溶液中，也会引起颜色变化，表明其离子变色性质。考虑到这些溶剂化和离子变色性质与闭环异构体之间的化学平衡变化有关，一种具有扩展的π-共轭体系，而另一种由于与溶剂分子和高阴离子的强烈相互作用而具有有限的π-共轭。供体编号。

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