香豆素C545T红外光谱的理论计算和实验研究  

Theoretical calculation and experimental studyon infrared spectra of coumarin C545T

作　　者：练何华 吕昭月 邹若雨 尹煜 王潇 LIAN He-Hua;L Zhao-Yue;ZOU Ruo-Yu;YIN Yu;WANG Xiao(Department of Physics,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学物理学院,上海200237

出　　处：《原子与分子物理学报》2024年第6期21-27,共7页Journal of Atomic and Molecular Physics

基　　金：上海市大学生创新训练项目(S202210251107)。

摘　　要：通过量子化学计算和实验研究了香豆素C545T的红外吸收光谱.采用量子化学密度泛函理论在B3LYP/6-31G(d)基组水平计算了C545T的优化结构参数、红外光谱及其溶剂效应,同时通过傅里叶变换红外光谱仪测量C545T粉末和不同溶剂饱和溶液的红外吸收光谱,计算红外光谱与实验吻合得很好,线性回归相关性系数为0.9996.另外,C545T的红外光谱具有溶剂效应,以C=O为例,其伸缩振动频率随着溶剂极性的增大而减小,即产生红移,实验所测C=O伸缩振动频率与溶剂介电常数线性相关.The infrared absorption spectrum of coumarin C545T was studied by quantum chemical calculation and experiments. Based on quantum chemical density function theory, the optimized structural parameters, the infrared spectra of C545T and its solvent effect were calculated at the B3LYP/6-31G (d ) level. The infrared absorption spectra of C545T power and C545T saturated solutions with different solvents were also measured by Fourier transform infrared spectrometer. The calculated results are in good agreement with the experiments, with a linear regression correlation coefficient of 0.9996. In addition, the infrared spectrum of C545T exhibits solvent effect. Taking C=O for an example, its vibration frequency decreases with the increase of the solvent polarity, namely bathochromic shift. The experimental vibration frequency of C=O chemical bond is linearly related to the dielectric constant of the solvent.

关 键 词：红外光谱 溶剂效应 C545T 羰基 

分 类 号：O657[理学—分析化学]