• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Electronic Properties of 4-Substituted Naphthalimides
【24h】

Electronic Properties of 4-Substituted Naphthalimides

机译：4-取代萘二甲酰亚胺的电子性质

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper describes a study of excited-state properties of naphthalimide (NI) and four 4-substituted derivatives: 4-chloronaphthalimide (Cl-NI), 4-methylthionaphthalimide (MeS-NI), 4-nitronaphthalimide (O2N-NI), and 4-(N,N-dimethylaminonaphthalimide (Me2N-NI). Steady-state absorption and fluorescence spectra were collected in solvents of varying polarity to determine the excited-state character of NI derivatives. Furthermore, the excited-state dynamics were studied using femtosecond transient absorption spectroscopy. The experimental findings were compared to calculated data obtained using time-dependent density functional (TD-DFT) methods. We found that light absorption by all NI derivatives leads to the production of the second excited state (S2), which was found to have a n,π* character. Within 40 ps, the S2 state undergoes internal conversion to produce the S1 state. The S1 state is relatively long-lived (4 ns) and has charge-transfer character in NI derivatives with electron-withdrawing and electron-donating groups (MeS-NI, O2N-NI, and Me2N-NI). In the case of NI and Cl-NI, the S1 state has a π,π* character and undergoes intersystem crossing to produce the T1 state within 400 ps.
机译：本文描述了萘二甲酰亚胺（NI）和四种4-取代衍生物的激发态性质的研究：4-氯萘二甲酰亚胺（Cl-NI），4-甲基硫代萘二甲酰亚胺（MeS-NI），4-硝基萘二甲酰亚胺（O2N-NI）和4-（N，N-二甲基氨基萘二甲酰亚胺（Me2N-NI）。在不同极性的溶剂中收集稳态吸收和荧光光谱，以确定NI衍生物的激发态特性，并使用飞秒研究了激发态动力学瞬态吸收光谱法将实验结果与使用时变密度泛函（TD-DFT）方法获得的计算数据进行了比较，我们发现所有NI衍生物的光吸收都会导致产生第二个激发态（S2）。在40 ps内，S2状态经历内部转换以产生S1状态，该S1状态具有相对较长的寿命（4 ns），并且在带有电子的NI衍生物中具有电荷转移特性拉伸和供电子基团（MeS-NI，O2N-NI和Me2N-NI）。在NI和Cl-NI的情况下，S1状态具有π，π*特征，并且经过系统间交叉以在400 ps内产生T1状态。

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