• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Hybrid Conjugated Organic Oligomers Consisting of Oligodiacetylene and Thiophene Units: Synthesis and Optical Properties
【24h】

Hybrid Conjugated Organic Oligomers Consisting of Oligodiacetylene and Thiophene Units: Synthesis and Optical Properties

机译：包含低聚二乙炔和噻吩单元的杂化共轭有机低聚物：合成和光学性质

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

Novel and highly soluble hybrid conjugated organic oligomers consisting of oligodiacetylene and thiophene units have been synthesized in high purity through iterative and divergent approaches based on a sequence of Sonogashira reactions. The series of thiophene-containing oligodiacetylenes (ThODAs) and homocoupled ThODAs (HThODAs) show—both in solution and in the solid state—a strong optical absorption, which is progressively red shifted with increasing chain ength. The linear correlation of the absorption maximum (lA max) with the inverse of conjugation length (CL=number of double and triple bonds) shows that the effective conjugation length of this system is extended up to at least CL= 20. Furthermore, absorption measurementsof dropcast thin films display not only a bathochromic shift of the absorption maxima but also a higher wavelength absorption, which is attributed to increased p–p interactions. The wavelength of the maximum fluorescence emission (lE max) also increases with CL, and emission is maximal for oligomers with CL=7–12 (fluorescence quantum yield FF=~0.2). Both longer and shorter oligomers display marginal emission. The calculated Stokes shifts of these planar materials are elatively large (0.4 eV) for all oligomers, and likely due to excitation to the S2 state, thus suggesting that the presence of enyne moieties dominates the ordering of the lowest excited states. The luorescence lifetimes (tF) are short (tF,max=!1 ns) and closely follow the tendency obtained for the fluorescence quantum yield. The nisotropy lifetimes show a near-linear increase with CL, in line with highly rigid oligomers.
机译：通过基于Sonogashira反应序列的迭代和发散方法，以高纯度合成了由低聚二乙炔和噻吩单元组成的新型且高度可溶性的杂化共轭有机低聚物。含噻吩的低聚二乙炔（ThODAs）和均相偶联的ThODAs（HThODAs）系列在溶液和固态下均显示出强大的光学吸收，随着链长的增加，该吸收逐渐红移。吸收最大值（lA max）与共轭长度的倒数（CL =双键和三键的数目）呈线性相关关系，表明该系统的有效共轭长度至少扩展到CL = 20。滴铸薄膜不仅显示出吸收最大值的红移，而且还显示出更高的波长吸收，这归因于p-p相互作用的增加。最大荧光发射的波长（l max）也随CL的增加而增加，对于CL = 7–12的低聚物，其发射最大（荧光量子产率FF =〜0.2）。较长和较短的低聚物都显示边缘发射。对于所有低聚物，这些平面材料的斯托克斯位移计算值都非常大（0.4 eV），并且很可能是由于激发到S2状态，因此表明烯键部分的存在主导着最低激发态的排序。发光寿命（tF）是短的（tF，max ＝！1ns），并且紧随荧光量子产率获得的趋势。各向异性寿命显示出与CL接近线性增长，这与高刚性低聚物一致。

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