Synthesis and Crystal Structures of Fluorinated Chromophores for Second-Order Nonlinear Optics.
Synthesis and Crystal Structures of Fluorinated Chromophores for Second-Order Nonlinear Optics.
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用于二阶非线性光学的氟化发色团的合成和晶体结构。
DOI：
10.1002/chin.200744086
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
H. Nakanishi
中科院分区：
文献类型：
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作者：
H. Umezawa;S. Okada;H. Oikawa;H. Matsuda;H. Nakanishi
合成了4-[2-（4-二甲氨基-2,3,5,6-四氟苯基）乙基]-2,3,5,6-四氟-N，N，N-三甲基苯胺(2)的部分氟化骨架，作为二阶非线性光学（NLO）材料，降低了1.3和1.5 μm左右的吸收，降低了器件效率。制备了几种2的盐，发现2（2b）的三氟甲磺酸盐比4-硝基苯胺（pNA）的最大吸收波长更短。通过超瑞利散射（HRS）测量，发现2b的β值约为pNA的8倍。我们还通过定向气体模型对2波段估计的NLO系数(d)进行了x射线晶体学分析。我们发现2b（d11=610 pm V−1）的对角线组分约为2-甲基-4-硝基苯胺的14倍，2b（d12=155 pm V−1）的非对角线组分约为n -（4-硝基苯基）-l-脯氨醇的6.5倍。化合物2b应该是NLO应用的一个很好的候选者。
Partially fluorinated skeleton of 4-[2-(4-dimethylamino-2,3,5,6-tetrafluorophenyl)ethynyl]-2,3,5,6-tetrafluoro-N,N,N-trimethylanilinium (2) was synthesized as a second-order nonlinear optical (NLO) material to decrease the absorption around 1.3 and 1.5 μm, which deteriorates the device efficiency. Several salts of2were prepared, and we found that the trifluoromethanesulfonate salt of2(2b) had a shorter absorption-maximum wavelength compared to that of 4-nitroaniline (pNA). From hyper-Rayleigh scattering (HRS) measurement, the β value of2bwas found to be about 8 times greater than that of pNA. We also performed X-ray crystallographic analysis of2band estimated NLO coefficient (d) by the oriented gas model. We found that diagonal component of2b(d11=610 pm V−1) was about 14 times greater than that of 2-methyl-4-nitroaniline and off-diagonal component of2b(d12=155 pm V−1) was about 6.5 times greater than that ofN-(4-nitrophenyl)-l-prolinol. Compound2bshould be an excellent candidate for NLO applications.