Synthesis and crystal structures of imidazolium salts for quadratic optical nonlinearities

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• 作者：Dan Guo ; Yan Ren ; ^{ry@sdu.edu.cn} ; ^{renyan77@yahoo.com} ; Jie Liu ; Xutang Tao ; ^{txt@sdu.edu.cn}
• 关键词：Nonlinear optics ; Crystal growth ; Imidazolium ; Second harmonic generation ; Organic ; Synthesis
• 刊名：Dyes and Pigments
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：98
• 期：3
• 页码：384-392
• 全文大小：1928 K

文摘

We have developed a new organic cation core structure, trans-1-[p-(N, N-dimethylamino) styryl]-3-methylimidozalium for second order nonlinear optical (NLO) applications. Among the eight crystals of?imidozalium salts with various counter anions, trans-1-[p-[(N, N-dimethylamino) styryl]-3-methylimidozalium 1-naphthalenesulfonate (II) (DINS-1(II)) and trans-1-[p-(N, N-dimethylamino) styryl]-3-methylimidozalium mesitylenesulfonate (DITMS) exhibit acentric crystal structures. The former belongs to Pna2₁ space group, while the latter crystallizes in Pn phase. The macroscopic optical nonlinearity of the acentric crystals have been estimated by Kurtz and Perry powder test at various grain sizes. Compared to DINS-1(II), DITMS exhibits a relatively large second order nonlinearity benefiting from the almost parallel arrangement of the main molecular charge-transfer axis in lattice. The growth of the bulk DITMS crystal has been investigated.