含1,3-二硫-2叶立德烯的系列有机发色团的二阶非线性光学性质的理论研究

Theoretical Study on the Organic NLO Chromophores-1,3-dithiol-2-ylidene Moiety as the Electron-donating Part

设计了 1 2个含有 1 ,3 -二硫 -2叶立德烯的具有二阶非线性光学性质的有机发色团 ,对所研究分子用AM1方法进行几何构型优化 ,用 INDO/CI方法获得基态到各激发态的垂直跃迁能和振子强度 ,即电子光谱 ;在此基础上用 SOS公式计算系列分子的二阶非线性光学系数 βijk,并从微观上对这一系列分子进行比较 ,为进一步探索综合性能较好的

We designed 12 organic NLO chromophores with 1,3-dithiol-2-ylidene moiety as the electron-donating part. At first we optimize the geometry with AM1 method, then gain the spectroscopy using INDO/CI method which has been tested to be effective for the conjugated molecules. On the basis of this, we designed the program-SOS expression for calculating the first hyperpolarizability β and explained micro-mechanically in order to offer a theoretical instruction for exploring NLO materials possessing good properties.