• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemical Physics Letters >Sub-picosecond and picosecond dynamics in the S-1 state of [2,2 '-bipyridyl]-3,3 '-diol investigated by UV-visible transient absorption spectroscopy
【24h】

Sub-picosecond and picosecond dynamics in the S-1 state of [2,2 '-bipyridyl]-3,3 '-diol investigated by UV-visible transient absorption spectroscopy

机译：紫外可见瞬态吸收光谱法研究[2,2'-联吡啶基] -3,3'-二醇在S-1状态下的亚皮秒和皮秒动力学

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

S-1 excited state relaxation processes of [2,2'-bipyridyl]-3,3'-diol are investigated at room temperature in solution. After excitation at 355-360 nm, the transient UV-visible spectra are investigated in the 350-650 nm region where both transient absorption and stimulated emission occur. The signal is measured at various probe wavelengths as a function of time up to delays of 150 ps. The spectral features appear with times shorter than the instrumental resolution (< 200 fs) and evolve with slower dynamics in the 10-20 ps range. A. single-exponential on top of the instantaneous rise of the stimulated emission is observed with time constants of 8-10 ps depending on the solvent. This confirms the coexistence of two proton-transfer mechanisms, one directly forming the di-keto, the other involving the formation of the transient mono-keto tautomer. The transient absorption spectrum intensity decreases following a biexponential law, the fast component coinciding with that of the stimulated emission increase. The slow component is attributed to the decay of the (n, pi*) formed because of its proximity to the (pi, pi*) state. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 24]
机译：在室温下研究了[2,2'-联吡啶基] -3,3'-二醇的S-1激发态弛豫过程。在355-360 nm激发后，在瞬态吸收和受激发射均发生的350-650 nm区域中研究了瞬态UV-可见光谱。该信号是在各种探针波长下随时间变化直至150 ps的延迟而测得的。频谱特征的出现时间比仪器分辨率（<200 fs）短，并且在10-20 ps范围内以较慢的动态变化。观察到受激发射的瞬时上升之上的单指数，其时间常数为8-10 ps，具体取决于溶剂。这证实了两种质子转移机制的共存，一种直接形成二酮，另一种涉及形成瞬态单酮互变异构体。瞬态吸收光谱强度遵循双指数定律下降，快速分量与受激发射的分量一致。慢速分量归因于所形成的（n，pi *）由于其接近（pi，pi *）状态而衰减。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：24]

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