Remarkable Acceleration for Back-Reaction of a Fast Photochromic Molecule
Remarkable Acceleration for Back-Reaction of a Fast Photochromic Molecule
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DOI：
10.1021/jz100228w
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发表时间：
2010-04-01
影响因子：
5.7
通讯作者：
Abe, Jiro
中科院分区：
文献类型：
--
作者：
Harada, Yuka;Hatano, Sayaka;Abe, Jiro
我们证明了基于光驱动的可逆C-N单键断裂的光致变色可以在室温下在紫外光照射下快速显色并在数十微秒内连续快速热逆反应。根据Marcus理论，热逆反应将随着Δ G（0）的增加而加速，这与Δ G dagger的减小密切相关。我们认为，热逆反应的Δ G（0）可以通过使有色物质不稳定来扩大，并设计了pseudogem-DPI-PI[2.2]PC，其具有偶联二苯基咪唑和菲并咪唑基团的[2.2]对环芳烷部分。本研究表明，控制双自由基状态的稳定性是有效的，在加速热逆反应的光致变色[2.2]对环芳桥咪唑二聚体。
We demonstrate that photochromism based on light-driven reversible C-N single bond cleavage can enable rapid coloration upon UV light irradiation and successive fast thermal back-reaction within tens of microseconds at room temperature. According to Marcus theory, the thermal back-reaction would be accelerated with increasing Delta G(0), which is closely linked to the decrease in Delta G dagger. We have considered that the Delta G(0) of the thermal back-reaction could be enlarged by destabilizing the colored species and designed pseudogem-DPI-PI[2.2]PC, with a [2.2]paracyclophane moiety that couples diphenylimidazole and phenanthroimidazole groups. The present study demonstrates that controlling the stability of the biradical state is effective in accelerating the thermal back-reaction for the photochromic [2.2]paracyclophane-bridged imidazole dimer.