A Fast Photochromic Molecule That Colors Only under UV Light
A Fast Photochromic Molecule That Colors Only under UV Light
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DOI：
10.1021/ja810032t
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发表时间：
2009-04-01
影响因子：
15
通讯作者：
Abe, Jiro
中科院分区：
文献类型：
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作者：
Kishimoto, Yuta;Abe, Jiro
我们证明了基于光驱动可逆键断裂的光致变色可以在室温下在紫外光照射下快速着色并在数十毫秒内连续快速热漂白。我们已经成功地开发了一种具有对环芳部分的双咪唑衍生物，pseudogem-bisDP 1 [2.2]PC，当用紫外光照射时，其从无色变为蓝色。入射光均裂连接两个咪唑环的C-N键，产生一对咪唑基自由基。对环芳部分连接两个自由基，从而防止它们彼此扩散，并且自由基迅速彼此结合以翻转回原始的双咪唑。显示出这种强烈的光致变色和快速热漂白性能的光致变色材料可能是用于可能的快速光调制器应用的有前途的材料。
We demonstrate that photochromism based on light-driven reversible bond cleavage can enable rapid coloration upon UV light irradiation and successive fast thermal bleaching within tens of milliseconds at room temperature. We have succeeded in developing a bisimidazole derivative with a paracyclophane moiety, pseudogem-bisDP1[2.2]PC, that changes from colorless to blue when irradiated with UV light. The incident light homolytically cleaves the C-N bond that links the two imidazole rings, generating a pair of imidazotyl radicals. A paracyclophane moiety connects the two radicals, thereby preventing them from diffusing away from one another, and the radicals quickly bind with each other to flip back to the original bisimidazole. Photochromic materials showing such intense photocoloration and fast thermal bleaching performance could be promising materials for possible fast light modulator applications.