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首页> 外文期刊>RSC Advances >Polarization, second-order nonlinear optical properties and electrochromism in 4H-pyranylidene chromophores with a quinoid/aromatic thiophene ring bridge
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Polarization, second-order nonlinear optical properties and electrochromism in 4H-pyranylidene chromophores with a quinoid/aromatic thiophene ring bridge

机译：含有奎单/芳香噻吩环桥的4H-吡喃基乙烯发色团中的极化，二阶非线性光学性质和电致变色

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摘要

Push-pull systems, in which the proaromatic 4H-pyranylidene electron donor is conjugated with a dicyanomethylene acceptor through a quinoid thiophene as (part of) the electron relay, have been prepared, and their properties have been compared to those of a parent compound featuring an aromatic thiophene moiety. Different experimental techniques (X-ray diffraction, H-1 NMR, IR, Raman, UV-vis, cyclic voltammetry, spectroelectrochemistry, and NLO measurements) combined with theoretical calculations have been used for the study of the chromophores. Quinoidal derivatives, although neutral, show strongly polarized structures, with positive mu beta values and a progressive increase of the intramolecular charge transfer (ICT) on lengthening the pi-spacer. Comparison between compounds that only differ in the character (quinoid or aromatic) of the thiophene unit shows a more efficient ICT for the quinoid thiophene-containing chromophore, which influences the second-order NLO response. Furthermore, the thienyl ring has been also found to play a significant role in the ICT process for the analogous aromatic derivative.
机译：推拉系统，其中通过奎单甲蛋白作为（一部分）电子继电器的奎单甲基受体将梯族4H-吡喃基亚二甲基电子给体与二氰基甲蛋白缀合，并将其性质与母体化合物的特征相比芳香族噻吩部分。与理论计算结合的不同实验技术（X射线衍射，H-1 NMR，IR，Raman，UV-Vis，循环伏安法，光谱电化学和NLO测量已用于发色团的研究。 Quinoidal衍生物虽然中性，显示出强偏振的结构，具有正β值和延长PI-垫片上的分子内电荷转移（ICT）的逐步增加。在噻吩单元的特征（奎单或芳族）中仅不同的化合物之间的比较显示了含奎因噻吩的发色团的更有效的ICT，这影响了二阶NLO的反应。此外，还发现噻吩基环在类似芳族衍生物的ICT方法中发挥着重要作用。

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  • 来源
    《RSC Advances》 |2015年第1期|共12页
  • 作者

    Belen Marco A.; Mayorga Burrezo Paula; Mosteo Laura; Franco Santiago; Garin Javier; Orduna Jesus; Diosdado Beatriz E.; Villacampa Belen; Lopez Navarrete Juan T.; Casado Juan; Andreu Raquel;

  • 作者单位

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

    Univ Malaga Dept Quim Fis E-29071 Malaga Spain;

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

    Univ Zaragoza ICMA CSIC Serv Difracc Rayos X &

    Anal Fluorescencia E-50009 Zaragoza Spain;

    Univ Zaragoza ICMA CSIC Dept Fis Mat Condensada E-50009 Zaragoza Spain;

    Univ Malaga Dept Quim Fis E-29071 Malaga Spain;

    Univ Malaga Dept Quim Fis E-29071 Malaga Spain;

    Univ Zaragoza CSIC ICMA Dept Quim Organ E-50009 Zaragoza Spain;

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  • 正文语种 eng
  • 中图分类 化学;
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