采用量子化学半经验方法AMI对3种三联苯类化合物进行了理论研究,对探索新型联苯类液晶材料以及一些重要聚合物的基本原料的分子提供了一种新的研究方法.时各种化合物的构型优化表明,分子具有较大的离域订键,但不是一个完全的平面结构,三个苯环之间具有一定的扭转角度.对优化后的构型进行振动分析,其最小振动频率分别为:52.87,32.23,27.55cm^-1,均未出现虚频率.三种化合物的HOMO和LUMO之间的能量差AE分别为:8.341,8.112,8.166eV,△E较小,离域电子容易激发.在此基础上,用CIS方法分别计算了它们的荧光光谱;所的结果与实验值基本符合.
A theoretical study on three tripheyl compounds by semi,empirical method is given in:this paper. Their geometric configurations have been optimized by semi-empirical method AMI:The results of optimization show that three pheyls are not in the same plane. Their smallest vibrational frequencies are 52.87, 32.23, 27.55cm^-1 and there is no imaginary frequency in vibrational analysis. Energy differences between HOMO and LUMO are 8.341,8.112,8.166eV. AE is so small that the electrons can be easily excited. Their fluorescence spectra have also been calculated by CIS. The values are essentially consistent with ,experimental values.