对称型双偶氮化合物的合成及其三阶非线性光学性能研究  

Third-Order NLO Properties of Symmetrical Diazo Compounds

作　　者：栾兆昌[1] 李娜君[1] 徐庆锋[1] 夏雪伟[1] 路建美[1] 

机构地区：[1]苏州大学材料与化学化工学部江苏省有机合成重点实验室,江苏苏州215123

出　　处：《高校化学工程学报》2010年第5期847-851,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20571054;20876101);江苏省高技术研究项目(BG2005021);苏州市科技攻关项目(SG0718)

摘　　要：设计并合成了一组含有二苯砜和二苯醚结构的对称型双偶氮化合物,通过红外光谱、紫外-可见吸收光谱、核磁共振和元素分析等方法对化合物材料的结构进行了表征。采用单光束Z-扫描的方法研究了它们的三阶非线性光学性能。所有化合物在稀溶液中都具有10-12(esu)数量级的三阶非线性极化系数,并且分别由非线性吸收和非线性折射两方面所贡献;分子内同时含有二苯砜吸电子基团和二甲氨基供电子基团的化合物(Azo2)的三阶非线性极化系数最大。考察化合物的分子结构对三阶非线性光学性能的影响,发现共轭型有机分子的三阶非线性光学性能是与其共轭体系的大小密切相关的。在设计这类分子结构时,关键就在于如何有效地形成大的共轭体系。A series of symmetrical diazo compounds containing diphenylsulfone or diphenylether were synthesized and characterized by UV-Vis,FT-IR,1H-NMR and elemental analysis,respectively.The third-order nonlinear optical properties（NLO） of the synthesized diazo compounds were investigated by single-beam Z-scan technique using 532 nm lasers light.The results show that they all have large third-order nonlinear susceptibility χ（3） which were formed by both the nonlinear absorption（NLA） and the nonlinear refraction（NLR）;and the synthesized compound Azo2 shows the largest χ（3） value because it contains a strong push-pull electron system consisted of the donor N,N-dimethylamino and the acceptor diphenylsulfone.The influence of the molecular structure on the third-order optical nonlinearities of the synthesized diazo compounds was studied,and it was found that the third-order nonlinear optical property of the diazo compounds is correlated with the conjunction degree of the π-electron in the conjugated system.It was also found that,for the conjugation type organic materials,in order to obtain good nonlinear optical property,finding a way to enlarge the conjugated system in their molecular structure is pivotal.

关 键 词：非线性光学材料 双偶氮 Z-扫描 超极化率 

分 类 号：O621.22[理学—有机化学] O625.64[理学—化学]