Rapid photo-oxidation reactions of imidazole derivatives accelerated by planar quinoid oxidation-state structures
作者:Yue Yu、Bohan Wang、Jianai Chen、Yujie Dong、Wang Zhan、Shitong Zhang、Weijun Li、Bing Yang、Cheng Zhang、Yuguang Ma
DOI:10.1039/d2ta09587d
日期:——
imidazole ring undergoes a rapid photo-oxidation reaction after the introduction of diphenylamine as the donor group into lophine. Based on DPA-PIM, a series of lophine derivatives with different donor groups were designed and synthesized. In situ absorption spectra indicated that lophine derivatives linked with the p-C position of the arylamine group exhibit photo-oxidation activity under UV irradiation
2,4,5-三苯基咪唑(lophine)及其衍生物的光氧化反应自从发现其化学发光现象以来得到了深入的研究。人们一致认为,如果咪唑中的氢被苄基或烷基取代,洛芬碱的光稳定性可以得到保持。然而,最近发现在咪唑环的N位被苯取代的lophine衍生物( DPA-PIM )在将二苯胺作为供体基团引入lophine后发生快速的光氧化反应。基于DPA-PIM,设计并合成了一系列具有不同供体基团的lophine衍生物。原位吸收光谱表明洛芬碱衍生物与芳基胺基的p -C位在紫外线照射下表现出光氧化活性。相比之下,当相应的芳胺基团的N位连接到苯取代的lophine时,可以保持衍生物的光稳定性。ESR 和电化学测量表明p中连接的芳胺基团-C位有助于lophine衍生物在紫外光照射下形成重排稳定的平面醌型氧化态结构,易被自敏单线态氧攻击。平面醌型结构极大地促进了这种光氧化反应的快速反应速率。因此,我们初步提出这种光氧