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Fast Negative Photochromism of 1,1′-Binaphthyl-Bridged Phenoxyl–Imidazolyl Radical Complex
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2016-01-12 , DOI: 10.1021/jacs.5b10924
Tetsuo Yamaguchi 1 , Yoichi Kobayashi 1 , Jiro Abe 1
Affiliation  

Negative photochromism, in which a thermally stable colored form isomerizes to the transient colorless form by light irradiation and the back reaction occurs thermally, is advantageous in its applications for photoswitching materials because visible light can cause the photochromic color change of the materials. Moreover, the photochromic color change can be induced even on the inside of the materials due to the absence of the reabsorption of the visible excitation light by the photogenerated colorless species. While several negative photochromic compounds have been reported, the time scales of the back reaction are still slower than minutes, and no available fast responsive negative photochromic compounds have been reported. Here, we developed a negative photochromic 1,1'-binaphthyl-bridged phenoxyl-imidazolyl radical complex (BN-PIC) which enables fast photoswitching by visible light. The stable colored BN-PIC shows instantaneous decoloration by visible light irradiation, and the photogenerated colorless form thermally reverts to the initial colored form with a half-life of 1.9 s at room temperature. BN-PIC can also cause the drastic change in the chiroptical properties by the photochromic reaction, and the rate of the thermal back reaction is affected by the chirality of the solvent. Since the negative photochromic reaction can occur on the inside of the materials, the fast negative photochromism is expected to have an impact in the fields of photoresponsive materials of solid states and molecular aggregates.

中文翻译:

1,1'-联萘桥联苯氧基-咪唑基自由基配合物的快速负光致变色

负光致变色,其中热稳定的有色形式通过光照射异构化为瞬态无色形式,并且热发生逆反应,在其用于光开关材料的应用中是有利的,因为可见光可以引起材料的光致变色颜色变化。此外,由于没有光生无色物质对可见激发光的重吸收,即使在材料内部也可以引起光致变色。虽然已经报道了几种负性光致变色化合物,但逆反应的时间尺度仍然比分钟慢,并且没有报道可用的快速响应负性光致变色化合物。在这里,我们开发了一种负光致变色 1,1' -联萘桥联苯氧基-咪唑基自由基复合物 (BN-PIC),可通过可见光实现快速光开关。稳定的有色 BN-PIC 在可见光照射下显示出瞬时脱色,光生无色形式在室温下热恢复为初始有色形式,半衰期为 1.9 秒。BN-PIC还可以通过光致变色反应引起手性的剧烈变化,热逆反应的速率受溶剂手性的影响。由于负性光致变色反应可以发生在材料内部,因此快速负性光致变色有望在固态和分子聚集体的光响应材料领域产生影响。稳定的有色 BN-PIC 在可见光照射下显示出瞬时脱色,光生无色形式在室温下热恢复为初始有色形式,半衰期为 1.9 秒。BN-PIC还可以通过光致变色反应引起手性的剧烈变化,热逆反应的速率受溶剂手性的影响。由于负性光致变色反应可以发生在材料内部,因此快速负性光致变色有望在固态和分子聚集体的光响应材料领域产生影响。稳定的有色 BN-PIC 在可见光照射下显示出瞬时脱色,光生无色形式在室温下热恢复为初始有色形式,半衰期为 1.9 秒。BN-PIC还可以通过光致变色反应引起手性的剧烈变化,热逆反应的速率受溶剂手性的影响。由于负性光致变色反应可以发生在材料内部,因此快速负性光致变色有望在固态和分子聚集体的光响应材料领域产生影响。BN-PIC还可以通过光致变色反应引起手性的剧烈变化,热逆反应的速率受溶剂手性的影响。由于负性光致变色反应可以发生在材料内部,因此快速负性光致变色有望在固态和分子聚集体的光响应材料领域产生影响。BN-PIC还可以通过光致变色反应引起手性的剧烈变化,热逆反应的速率受溶剂手性的影响。由于负性光致变色反应可以发生在材料内部,因此快速负性光致变色有望在固态和分子聚集体的光响应材料领域产生影响。
更新日期:2016-01-12
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