...
  • 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 >Caging and Geminate Recombination following Photolysis of Triiodide in Solution
【24h】

Caging and Geminate Recombination following Photolysis of Triiodide in Solution

机译：溶液中三碘化物的光解后的笼型和双联重组

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

A survey of caging and geminate recombination dynamics following the UV photolysis of I_3~- in a series of polar solvents is presented. Transient absorption in both the near-IR and UV was measured out to delays of 0.4 ns, probing evolution of the nascent product and recombined reactants, respectively. The fate of photolysis fragments is suggested to be determined shortly after the act of bond fission. Kinetic analysis shows caged fragments either recombine directly and vibrationally relax within a few picoseconds or produce long-lived complexes of unknown structure that decay exponentially in ～40 ps, and both routes lead to ground-state I_3~-. The persistent complex exhibits a near-IR absorption spectrum that is broadened and red-shifted relative to free I_2~-. A very shallow and slow residual component of recombination may be associated with encounters of geminate pairs that initially escape the solvent cage. The choice of solvent strongly effects the probability and dynamics of caging, but not the decay rate of complex caged pairs. This is not altered by varying the temperature of an isobutyl alcohol solution from 5 to 45 ℃. The results are discussed in an effort to illuminate the role played by the solvent in triiodide recombination in solution.
机译：介绍了在一系列极性溶剂中I_3〜-的UV光解后，笼型和双峰重组动力学的概况。测量到近红外和紫外光的瞬态吸收延迟为0.4 ns，分​​别探测了新生产物和重组反应物的演变。建议在键裂变后不久确定光解片段的命运。动力学分析表明，笼状碎片要么直接复合并在几皮秒内振动松弛，要么生成未知结构的长寿命复合物，它们在〜40 ps内呈指数衰减，并且两种途径均导致基态I_3〜-。持久复合物表现出相对于游离I_2〜-扩大和红移的近红外吸收光谱。重组的非常浅且缓慢的残留成分可能与最初逃脱溶剂笼的成对双键相遇有关。溶剂的选择会强烈影响笼养的可能性和动力学，但不会影响复杂笼对的衰变速率。通过将异丁醇溶液的温度从5改变到45℃并不能改变这一点。为了阐明溶剂在溶液中三碘化物重组中所起的作用，对结果进行了讨论。

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