碳硼烷桥连噻吩化合物结构和二阶非线性光学系数的DFT计算  

Density Functional Theory Study on Structure and Second-order Nonlinear Optical Coefficients of Compounds Involving Carborane Bridges with Thiophen

作　　者：李雪[1] 孙世玲[1] 麻娜娜[1] 樊敏[1] 仇永清[1] 付强[1] 

机构地区：[1]东北师范大学化学学院功能材料化学研究所,长春130024

出　　处：《化学学报》2011年第5期523-528,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(No.20873017)资助项目

摘　　要：采用密度泛函理论(DFT)B3LYP方法,计算分析了7个以碳硼烷和苯环为桥连基团化合物的非线性光学(NLO)特征,结果表明:桥连基团的体积越大,对提高极化率的值越有利;分子桥连部分的电子离域性以及分子的几何构型对二阶NLO系数有重要影响,电子跃迁时的电荷转移程度对二阶NLO性质有较大贡献.通过分析分子的电子光谱和对应的分子轨道组成可知,碳硼烷不仅可以作为传输电子的桥梁,还可以作为吸电子基团.The nonlinear optical （NLO） properties of seven compounds using carborane and benzene rings as the bridging groups were investigated at the density functional theory （DFT） B3LYP method. The results indicate that a larger size bridging groups would be helpful in enhancing the polarizability. Electron delocal- ization of bridging group has an important influence on the second-order NLO coefficients as well as the molecular geometry, and the charge transfer has a greater contribution to the NLO properties. Moreover, from the analysis of electronic spectrum and the corresponding molecular orbit composition, it illustrates that the carborane can be not only the bridge for electron transmission, but also the electron withdrawing group.

关 键 词：碳硼烷 电子光谱 NLO性质 DFT 

分 类 号：O621.13[理学—有机化学]