首页> 外文期刊>Chemistry: A European journal >Accessing the Triplet State in Heavy-Atom-Free Perylene Diimides
【24h】

Accessing the Triplet State in Heavy-Atom-Free Perylene Diimides

机译:在无重原子的Di二酰亚胺中进入三重态

获取原文
获取原文并翻译 | 示例
           

摘要

Previous studies of perylenediimides (PDIs) mostly utilized the lowest singlet excited state S-1. Generation of a triplet excited state (T-1) in PDIs is important for applications ranging from photodynamic therapy to photovoltaics; however, it remains a formidable task. Herein, we developed a heavy-atom-free strategy to prompt the T1S1 intersystem crossing (ISC) by introducing electron-donating aryl (Ar) groups at the head positions of an electron-deficient perylenediimide (PDI) core. We found that the ISC efficiency increases from 8 to 54% and then to 86% by increasing the electron-donating ability of head-substituted aryl groups from phenyl (p-PDI) to methoxyphenyl (MeO-PDI) and then to methylthioxyphenyl (MeS-PDI). By enhancing the intramolecular charge-transfer (ICT) interaction from p-PDI to MeO-PDI, and then to MeS-PDI, singlet oxygen generation via energy-transfer reactions from T-1 of PDIs to O-3(2) was demonstrated with the highest yield of up to 80%. These results provide guidelines for developing new triplet-generating PDIs and related rylene diimides for optoelectronic applications.
机译:ylene二酰亚胺(PDI)的先前研究主要利用最低的单重态激发态S-1。 PDI中三重激发态(T-1)的产生对于从光动力疗法到光伏技术的应用非常重要;但是,这仍然是一项艰巨的任务。在这里,我们开发了一种无重原子的策略,通过在缺电子的per二酰亚胺(PDI)核的头部引入电子给体芳基(Ar)基团来促进T1S1系统间穿越(ISC)。我们发现,通过增加头取代的芳基的供电子能力,从苯基(p-PDI)到甲氧基苯基(MeO-PDI),再到甲硫基苯基(MeS),ISC效率从8%提高到54%,然后提高到86% -PDI)。通过增强从p-PDI到MeO-PDI,再到MeS-PDI的分子内电荷转移(ICT)相互作用,证明了通过PDI的T-1到O-3(2)的能量转移反应产生单线态氧最高收率可达80%。这些结果为开发用于光电应用的新型三重态PDI和相关的二甲苯二酰亚胺提供了指导。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号