...
  • 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 >Photophysical Study of New Methanofullerene-TTF Dyads: An Obvious Intramolecular Charge Transfer in the Ground States
【24h】

Photophysical Study of New Methanofullerene-TTF Dyads: An Obvious Intramolecular Charge Transfer in the Ground States

机译：新的甲基富勒烯-TTF染料的光物理研究：在基态中明显的分子内电荷转移。

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

Three isomers of a new C60-TTF dyad-C_(60)-X-TTF (X = ortho, meta, and para)-have been synthesized by changing the linking positions (ortho, meta, and para) at a phenyl group that is attached to the methano[60]fullerene. The dyads showed clear intramolecular charge transfer (CT) absorption bands in the steady-state absorption spectra, which was indicative of an intramolecular CT interaction between the C_(60) and TTF moieties in the ground state. The increase in intensity of the CT absorption bands followed the order C_(60)-ortho-TTF > C_(60)-meta-TTF C60-para-TTF, which can be reasonably explained by the optimized molecular structures that are calculated at the ab initio level. Extreme quenching of the fluorescence intensity from the locally excited C60 moiety was observed to follow the aforementioned order, which suggests that very fast excited singlet-state dynamics are dependent on the isomers. The quenching of the absorption intensities of the triplet state of the C60 moiety detected in the nanosecond region was also observed to follow the same order, which suggests that competitive paths that are more efficient than intersystem crossing are present. From subpicosecond transient absorption measurements, very short-lived transient absorption bands attributed to the overlap of S1-Sn with the excited CT state that has strong CT character were obtained for C_(60)-ortho-TTF (and C_(60)-meta-TTF); appreciable charge-separated (CS) species were generated for C_(60)-para-TTF. The lifetimes of the CT and CS states increased in the order of C_(60)-ortho-TTF < C_(60)-meta-TTF < C_(60)-para-TTF. Overall, it was revealed that the ground and excited states are controlled by the difference in proximity between the C_(60) and TTF moieties, depending on the linking positions.
机译：通过改变苯基上的连接位置（邻位，间位和对位），合成了新的C60-TTF二元体-C_（60）-X-TTF（X =邻位，间位和对位）的三个异构体。附着在甲醇[60]富勒烯上。在稳定状态的吸收光谱中，二分体显示出清晰的分子内电荷转移（CT）吸收带，这表明在基态下C_（60）和TTF部分之间的分子内CT相互作用。 CT吸收带强度的增加遵循C_（60）-邻位-TTF> C_（60）-元-TTF C60-对-TTF的顺序，这可以合理地解释为：从头算水平。观察到来自局部激发的C60部分的荧光强度的极端猝灭遵循上述顺序，这表明非常快的激发单线态动力学取决于异构体。还观察到在纳秒区域中检测到的C60部分的三重态的吸收强度的猝灭遵循相同的顺序，这表明存在比系统间交叉更有效的竞争路径。通过亚皮秒的瞬态吸收测量，获得了C_（60）-邻位-TTF（和C_（60）-meta）归因于S1-Sn与具有强CT特性的激发CT状态重叠的非常短暂的瞬态吸收带-TTF）;为C_（60）-para-TTF生成了可观的电荷分离（CS）物种。 CT和CS状态的寿命按C_（60）-邻位-TTF

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