...
  • 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 >When 'Donor-Acceptor' Dyes Delocalize: A Spectroscopic and Computational Study of D-A Dyes Using 'Michler's Base'
【24h】

When 'Donor-Acceptor' Dyes Delocalize: A Spectroscopic and Computational Study of D-A Dyes Using 'Michler's Base'

机译：当“捐赠者 - 受体”染料染色剂时：使用“Michler Base”的D-A染料的光谱和计算研究

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

In this study, we show that the "Michler's base" motif can be combined in a donor-acceptor arrangement with a range of acceptor units (indandione, indandione with cyano substituents, barbituric acid, or rhodanine) to give photophysical properties that are dominated by delocalized excited states. By changing the acceptor unit and by altering the planarity of this system, it is possible to tune the low-energy absorption feature in terms of intensity from 23 000 to 67 000 M-1 cm(-1) and energy between 500 and 700 nm. Resonance Raman spectroscopy and time-dependent density functional theory indicate that this absorption feature has two underlying transitions: a weaker charge-transfer transition around 500 nm and a strong mixed or delocalized transition between 550 and 700 nm. Generally, these compounds are not strongly emissive; however, dual emission is observed, and the relative intensity of the two states can be modulated by solvent polarity. The energy of these emissive states does not correlate with the Lippert-Mataga analysis in which the Stokes shift is related to the solvent polarity (Delta f).
机译：在这项研究中，我们表明“MICHLER的基础”图案可以在供体接受者排列中组合，其中一系列受体单位（吲哚替碘，与氰取代基，巴比妥酸或罗丹宁的吲哚酮，rhodanine），以给予主导的光物理性质临近兴奋状态。通过改变受体单元并通过改变该系统的平面性，可以在23 000到67 000 m-1cm（-1）和500到700nm之间的能量方面调谐低能量吸收特征。共振拉曼光谱和时间依赖性密度函数理论表明该吸收特征具有两个潜在的转变：较弱的电荷转移过渡约为500nm，在550至700nm之间的强烈的混合或分层过渡。通常，这些化合物不是强烈发射的;然而，观察到双发射，并且可以通过溶剂极性调节两种状态的相对强度。这些发光态的能量与脂肪植物 - MATAGA分析不相关，其中斯托克斯偏移与溶剂极性（Delta F）有关。

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