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首页> 外文期刊>Crystal growth & design >Engineering of acentric stilbazolium salts with large second-order optical nonlinearity and enhanced environmental stability
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Engineering of acentric stilbazolium salts with large second-order optical nonlinearity and enhanced environmental stability

机译：具有大的二阶光学非线性和增强的环境稳定性的非中心噻唑鎓盐工程

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摘要

A series of organic nonlinear optical (NLO) materials based on the stilbazolium derivatives of 4-N,N-dimethylamino-4′-N′-methyl- stilbazolium tosylate (DAST) were synthesized, and the single crystals were grown from the solutions. Single-crystal structure determinations and Kurtz powder tests reveal that replacement of the p-toluenesulfonate anion in the DAST crystal, forming 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium 4-aminotoluene-3-sulfonate (1) and 4-N,N-dimethylamino-4′-N′-methyl- stilbazolium p-chlorobenzenesulfonate (2), constructs new acentric crystals with quite a large powder second-harmonic generation (SHG) of more than 3 orders of magnitude larger than that of urea around 2.0 μm, whereas the other two complexes show their centrosymmetric structures without any SHG effects. A possible estimation of the molecular first hyperpolarizabilities β_(ijk) performed on 2 further confirms its origin of its enhanced NLO merits. Furthermore, both 1 and 2 exhibit even higher environmental stabilities, including the antiwater performance and the formation of anhydrous phases in water-containing solutions. We believe that the findings of the further counterion modification will bring new stilbazolium derivatives with improved optical nonlinearities and the physicochemical performances.
机译：合成了一系列基于4-N，N-二甲基氨基-4'-N'-甲基-苯乙烯基甲苯磺酸甲苯酯的噻唑衍生物的有机非线性光学材料，并从溶液中生长出单晶。单晶结构测定和Kurtz粉末测试表明，在DAST晶体中取代了对甲苯磺酸根阴离子，形成了4-N，N-二甲基氨基-4'-N'-甲基-azo鎓4-氨基甲苯-3-磺酸盐（1 ）和4-N，N-二甲基氨基-4'-N'-甲基-噻唑鎓对氯苯磺酸盐（2）构成新的无心晶体，具有较大的粉末二次谐波（SHG），其大3个数量级以上比2.0μm左右的尿素要大，而另外两个配合物显示出其中心对称结构而没有任何SHG效应。对2进行的分子第一超极化率β_（ijk）的可能估计进一步证实了其增强的NLO优点。此外，1和2均表现出更高的环境稳定性，包括在水性溶液中的抗水性能和无水相的形成。我们相信，进一步的抗衡离子修饰的发现将带来具有改善的光学非线性和理化性能的新的噻唑鎓衍生物。

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