• 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 >Fluorescence Quenching in Electron-Donating Solvents.2.Solvent Dependence and Product Dynamics
【24h】

Fluorescence Quenching in Electron-Donating Solvents.2.Solvent Dependence and Product Dynamics

机译：电子给体溶剂中的荧光猝灭2．溶剂依赖性和产物动力学

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

The electron transfer quenching dynamics of excited perylene and cyanoperylene in various donating solvents has been investigated by using ultrafast fluorescence up-conversion and multiplex transient grating.The strongly nonexponential fluorescence decays have been analyzed by using the orientational model described in the first article of this series (J.Phys.Chem.A 2003,107,5375).It appears that the solvent dependence of the quenching dynamics is strongly connected to the number of surrounding donor molecules enabling ultrafast electron transfer.This number depends mainly on the driving force for electron transfer,on steric interactions,and on the occurrence of dipole-dipole interactions with the acceptor.The quenching product is an exciplex with a strong charge-transfer character.The complicated wavelength dependence of the fluorescence dynamics in the exciplex region,as well as the spectral dynamics observed in the transient grating data,is attributed to dipolar solvation,which leads to an increase of the charge-transfer character of the exciplex.The strong donor dependence of the exciplex lifetime is very similar to that reported earlier for the charge recombination time of geminate ion pairs in acetonitrile,and can be rationalized in terms of different intramolecular reorganization energies and electronic coupling constants.
机译：使用超快速荧光上转换和多重瞬态光栅研究了在各种供体溶剂中激发的per和氰基ylene的电子传递猝灭动力学，并使用该系列第一篇文章中描述的取向模型分析了强非指数荧光衰减。 （J.Phys.Chem.A 2003,107,5375）。淬灭动力学的溶剂依赖性似乎与能够超快电子转移的周围施主分子的数量密切相关，该数量主要取决于电子的驱动力猝灭产物是具有强电荷转移特性的激基复合物。激基复合物区域中荧光动力学的复杂波长依赖性以及在瞬态光栅数据中观察到的光谱动力学归因于偶极溶剂化，这导致激基复合物寿命的强供体依赖性与先前报道的乙腈中双键离子对的电荷重组时间非常相似，并且可以根据分子内的不同进行合理化。重组能量和电子耦合常数。

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