• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >New and efficient arrays for photoinduced charge separation based on perylene bisimide and corroles
【24h】

New and efficient arrays for photoinduced charge separation based on perylene bisimide and corroles

机译：基于per双酰亚胺和Corroles的新型高效光诱导电荷分离阵列

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 bichromophoric systems C2-PI, CXPI, and C3-PPI consisiting of corrole and perylene bisimide units and representing one of the rare cases of elaborate structures based on corrole, have been synthesized. Corroles C2 and C3 are, respectively, meso-substituted corroles with 2,6-dichlorophenyl and pentafluorophenyl substituents at the 5 and 15 positions. The three dyads were prepared by divergent strategy with the corrole-forming reaction as the last step of the sequence. C2-PI and C3-PI differ in the nature of the corroles, whereas C3-PI differs from C3-PPI in the presence of a further phenyl unit in the linker between photoactive units. The dyads display spectroscopic properties which are the superposition of the component spectra, indicating a very weak electronic coupling. Excitation of the corrole unit leads to charge separation with a rate which decreases from 2.4 x 10(10), to 5.0 x 10(9), and. to 4.9 x 10(7) s(-1) for C2-PI, C3-PI, and C3-PPI, respectively, where the reaction is characterized by a Delta G degrees > 0. Excitation of the perylene bisimide unit is followed by competing reactions of: 1) energy transfer to the corrole unit, which subsequently deactivates to the charge-separated state and; 2) electron transfer to directly form the charge-separated state. ne ratio of electron-to-energy-transfer rates is 9:1 and 1:1 for C3-PI and C3-PPI, respectively. The yield of charge separation is essentially 100% for C2-PI and C3-PI, and approximately 50% (excitation of peryleneimide) or 15% (excitation of the corrole) for C3-PPI. The lifetime of the charge-separated state, observed for the first time in corrole-based structures, is 540 ps for C2-PI, 2.5 ns for C3-PI, and 24 ns for C3-PPI, respectively. This is in agreement with an inverted behavior, according to Marcus theory.
机译：合成了双发色体系C2-PI，CXPI和C3-PPI，由腐蚀和ro双酰亚胺单元组成，代表了基于腐蚀的复杂结构的罕见情况之一。化合物C2和C3分别是在5和15位具有2，6-二氯苯基和五氟苯基取代基的内消旋取代的化合物。通过发散策略制备了三个二元组，其中形成胶体的反应是该序列的最后一步。 C2-PI和C3-PI的性质不同，而C3-PI与C3-PPI的区别在于光敏单元之间的连接基中还存在另一个苯基单元。二面体显示的光谱性质是组分光谱的叠加，表明电子耦合非常弱。激发腐蚀单元会导致电荷分离，速率从2.4 x 10（10）降低到5.0 x 10（9）和。 C2-PI，C3-PI和C3-PPI分别达到4.9 x 10（7）s（-1），其中反应的特征在于Delta G度>0。在激发per双酰亚胺单元之后，竞争的反应：1）能量转移到腐蚀单元，随后钝化到电荷分离状态;和2）电子转移直接形成电荷分离状态。 C3-PI和C3-PPI的电子与能量传输速率之比分别为9：1和1：1。对于C2-PI和C3-PI，电荷分离的收率基本上为100％，对于C3-PPI，电荷分离的产率约为50％（per酰亚胺的激发）或15％（Corrole的激发）。首次在基于腐蚀的结构中观察到的电荷分离状态的寿命对于C2-PI为540 ps，对于C3-PI为2.5 ns，对于C3-PPI为24 ns。根据马库斯（Marcus）理论，这与倒立行为一致。

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