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首页> 外文期刊>Optical Materials >Strategies For Optimising The Second-order Nonlinear Optical Response In Zwitterionic Merocyanine Dyes
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Strategies For Optimising The Second-order Nonlinear Optical Response In Zwitterionic Merocyanine Dyes

机译：两性离子花菁染料中二阶非线性光学响应的​​优化策略

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摘要

The molecular linear and nonlinear optical (NLO) properties of a series of seven merocyanine dyes have been studied in solvents covering a broad range of polarity (dioxane to dimethylsulfoxide). The benchmark for the series was the "Right hand side" zwitterionic chromophore 1, with a short conjugation path and 4-pyridinylidene as the donor group. Optimization strategies to improve the nonlinear response involved an extension of the conjugation path (with one or two ethenyl groups), annelation (pyridine to quinoline), variation of the solvent polarity and partial ring locking of the 7t-conjugated system. All chromophores have as the acceptor moiety the cyanodicyanomethylidenedihydrofuran heterocycle. Optimising the NLO response of these zwitterionic dyes by decreasing the polarity of the solvent is only possible for the parent chromophore 1. This is because the three other successful strategies employed to further improve the second-order NLO response in polar media, result in detrimental aggregation in non-polar media.
机译：已在涵盖广泛极性（二恶烷至二甲基亚砜）的溶剂中研究了一系列七种花菁染料的分子线性和非线性光学（NLO）特性。该系列的基准是“右手侧”两性离子发色团1，具有短的共轭路径，且4-吡啶基亚基为供体基团。改善非线性响应的优化策略包括延长共轭路径（带有一个或两个乙烯基），去核作用（吡啶到喹啉），溶剂极性的变化和7t共轭体系的部分环锁。所有生色团均具有氰基二氰基甲基亚甲基二氢呋喃杂环作为受体部分。通过降低溶剂的极性来优化这些两性离子染料的NLO响应仅对于母生色团1是可行的。这是因为其他三个成功采用的策略可以进一步改善极性介质中的二阶NLO响应，从而导致有害的聚集在非极性介质中。

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