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首页> 外文OA文献 >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：带有醌/芳族噻吩环桥的4H-吡喃基生色团的偏振，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, 1H 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 μβ values and a progressive increase of the intramolecular charge transfer (ICT) on lengthening the π-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：制备了推挽系统，其中原芳香族4H-吡喃亚基电子供体通过作为电子继电器的一部分的喹啉噻吩与二氰基亚甲基受体共轭，并且已将其性能与具有以下特征的母体化合物进行了比较芳族噻吩部分。不同的实验技术（X射线衍射，1 H NMR，IR，拉曼，紫外可见，循环伏安法，光谱电化学和NLO测量）与理论计算相结合已用于发色团的研究。醌型衍生物尽管是中性的，但显示出强极化的结构，具有正的μs值，并且在延长π-间隔子时分子内电荷转移（ICT）逐渐增加。仅在噻吩单元的特征（喹啉或芳族）方面不同的化合物之间的比较显示，含醌噻吩的生色团的信息通信技术效率更高，这会影响二阶NLO反应。此外，还发现噻吩基环在ICT过程中对于类似的芳族衍生物起着重要作用。

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