• 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 >Electron Transfer across o-Phenylene Wires
【24h】

Electron Transfer across o-Phenylene Wires

机译：O-亚苯基电线的电子转移

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

Photoinduced electron transfer across rigid rod-like oligo-p-phenylenes has been thoroughly investigated in the past, but their o-connected counterparts are yet entirely unexplored in this regard. We report on three molecular dyads comprised of a triarylamine donor and a Ru(bpy)(3)(2+) (bpy =2,2'-bipyridine) acceptor connected covalently by 2 to 6 o-phenylene units. Pulsed excitation of the Ru(II) sensitizer at 532 nm leads to the rapid formation of oxidized triarylamine and reduced ruthenium complex via intramolecular electron transfer. The subsequent thermal reverse charge-shift reaction to reinstate the electronic ground-state occurs on a time scale of 120-220 ns in deaerated CH3CN at 2S degrees C. The conformational flexibility of the o-phenylene bridges causes multiexponential transient absorption kinetics for the photoinduced forward process, but produces single-exponential transient absorption decays. The key finding is that the flexible o-phenylene bridges permit rapid formation of photoproducts storing ca. 1.7 eV of energy with lifetimes on the order of hundreds of nanoseconds, similar to what is possible with rigid rod-like donor acceptor compounds. Thus, the conformational flexibility of the o-phenylenes represents no disadvantage with regard to the photoproduct lifetimes, and this is relevant in the greater context of light-to-chemical energy conversion.
机译：过去已经彻底研究了刚性棒状寡核苷酸的光突出的电子转移，但在这方面，他们的O连接对应物尚未完全未开发。我们报告三种分子二元，该分子二元包含三芳基胺供体和Ru（BPY）（3）（2+）（Bpy = 2,2'-Bi0吡啶）受体通过2至6 o-苯基单元连接。 Ru（II）敏化剂在532nm处的脉冲激发导致氧化三芳基胺的快速形成，通过分子内电子转移还原钌络合物。恢复电子地基的随后的热反转电荷反应在2S℃下脱气的CH 3 CN中的120-220ns的时间等级发生。O-亚苯基桥的构象柔韧性导致多态瞬态吸收动力学进行光诱导前进过程，但产生单指数瞬态吸收衰减。关键发现是柔性O-亚苯基桥允许快速形成存储CA的光调节。 1.7能量，寿命随着数百纳秒的阶段，类似于刚性杆状供体受体化合物的可能性。因此，O-苯乙烯的构象柔韧性表示对光调节寿命没有缺点，这在光学能量转换的较大背景下是相关的。

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