Study on the physical and chemical properties of dimethyl sulfoxide under the external electric field

电场 拉曼光谱 材料科学 偶极子 密度泛函理论 红外线的 分子物理学 原子物理学 分析化学(期刊) 核磁共振 计算化学 化学 物理 光学 有机化学 量子力学
作者
Boyuan Han,Jun Feng,Nuerbiye Aizezi,Yuzhu Liu
出处
期刊:Physica Scripta [IOP Publishing]
卷期号:98 (11): 115011-115011 被引量:3
标识
DOI:10.1088/1402-4896/acfce8
摘要

Abstract Dimethyl sulfoxide (DMSO) is a versatile solvent used in many fields such as medicine and organic synthesis, whereas it is poisonous and harmful to human health. Physical and chemical properties, including bond length, dipole moment, total energy, frontier orbital energy, infrared absorption spectrum as well as the Raman spectrum of the DMSO molecule under an external electric field ranging from 0 to 0.03 atomic units were calculated by using the density functional theory (DFT) with the B3LYP/6-311G++(2d, p) basis set. According to the calculation, it has been found that as the external electric field increases, the two strongest infrared absorption peaks redshift and change in intensity. At the same time, a distinct new characteristic peak emerges in the Raman spectrum when the electric field is applied. Moreover, the Raman characteristic lines of DMSO were detected based on a self-designed Raman spectrometer. The potential energy curves under the increasing electric field were obtained by scanning the single-point energy along the S=O bond with the method B3LYP/6-311G (d, p). By fitting a linear curve between the potential barrier and the electric field, the intensity of the field corresponding to the zero potential barrier was computed. The results provide important theoretical references for further research about the DMSO’s physical and chemical properties and indicate that the structure and properties of molecules change significantly under an external electric field.
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