Cui Yuanjing, Qian Guodong, Gao Junkuo, Chen Lujian, Wang Zhiyu, Wang Minquan
Department of Materials Science and Engineering, State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China.
J Phys Chem B. 2005 Dec 15;109(49):23295-9. doi: 10.1021/jp0549677.
Four kinds of hydroxy-ended azobenzene-type chromophores containing different substituent groups as electron donor or electron acceptor were synthesized and further reacted with 3-isocyanatopropyltriethoxysilane (ICTES) to give alkoxysilane dyes via a urethane reaction. Following a sol-gel process of the alkoxysilane dyes, the inorganic-organic hybrid nonlinear optical (NLO) films were successfully prepared. Molecular structures of the resultant films were confirmed by elemental analysis, FTIR, and 1H NMR. The betaCT mu(g) values of the chromophores were evaluated by a solvatochromic method, and the second harmonic coefficients (d33) of the hybrid films were measured by in situ second harmonic generation (SHG) measurement. The hybrid films exhibited large optical nonlinearity and full transparency in the visible range. The effects of substituent group and position on betaCT mu(g) values of the chromophores and d33 values of the films were also discussed.
合成了四种含有不同取代基作为电子供体或电子受体的羟基端基偶氮苯型发色团，并使其与3-异氰酸酯基丙基三乙氧基硅烷（ICTES）进一步反应，通过聚氨酯反应得到烷氧基硅烷染料。经过烷氧基硅烷染料的溶胶-凝胶过程，成功制备了无机-有机杂化非线性光学（NLO）薄膜。通过元素分析、傅里叶变换红外光谱（FTIR）和核磁共振氢谱（1H NMR）确定了所得薄膜的分子结构。通过溶剂化显色法评估发色团的βCT μ(g)值，并通过原位二次谐波产生（SHG）测量来测量杂化薄膜的二次谐波系数（d33）。杂化薄膜在可见光范围内表现出较大的光学非线性和完全透明性。还讨论了取代基和位置对发色团的βCT μ(g)值和薄膜的d33值的影响。
