Regulation Research Of Carbon Tetrachloride Fermi Resonance By Solvent Effect

Fermi resonance（FR）is an important process of intramolecular and intermolecular energy transfer,which is the simplest system model of vibration energy redistribution.Changes in the solvent environment usually lead to changes in the interaction between solvent molecules and solute molecules,that is,solvent effect,which will affect the energy transfer process between the Fermi resonance double peaks.Therefore,an in-depth understanding of the regulation of solvent effects on Fermi resonance will help to better understand the energy transfer mechanism of Fermi resonance and help to apply it in spectroscopy,materials science,geology,biology and other fields.Raman spectroscopy is a very commonly used method for studying the structure of substances,which can provide the relationship between the vibration,rotation,and electronic states of molecules.It is known as molecular fingerprints.In this paper,Raman spectroscopy was used as the main research means to explore the regulatory effect of polar solvents acetone（AC）and dimethyl sulfoxide（DMSO）,as well as non-polar solvents benzene（C₆H₆）and toluene（MB）on the Fermi resonance of carbon tetrachloride molecule,and the following conclusions were obtained:1.Comparing the regulation mechanism of AC and DMSO on the Fermi resonance of CCl₄,the energy transfer degree of the CCl₄-DMSO binary solution is higher than that of the CCl₄-AC binary solution,because DMSO and AC are due to the orphan on the central sulfur atom of DMSO The presence of electron pairs makes the combination of DMSO and CCl₄different from that of AC,which does not have lone electron pairs on the central atom carbon.AC and CCl₄are dominated by hydrogen bond forces,while DMSO is dominated by ion-dipole forces,so the different central atoms affect the intermolecular binding mode and regulate the degree of Fermi resonance in solution.2.Compared with C₆H₆and MB non-polar solvents,the force between C₆H₆and CCl₄is mainly hydrogen bond force,which can dissolve well and exchange energy smoothly due to the hydrogen bond effectν₁+ν₄andν₃.The coupling degree is relatively high,and in the binary solution of MB and CCl₄,the repulsive force between the same molecules of MB and CCl₄is greater than the dispersion force between MB and CCl₄,which makes the self-association of CCl₄enhancedν₃The intensity is high,so the coupling degree of Fermi resonance is low,which indicates that the different terminal functional groups of C₆H₆and MB change the type of intermolecular force,so there is a regulatory mechanism for CCl₄Fermi resonance.In this paper,the influence of solvent effect on the Fermi resonance of liquid carbon tetrachloride was studied,and the regulation mechanism of solvent effect on Fermi resonance was studied.This provides a theoretical basis for the future analysis of models with Fermi resonance characteristic functional groups,and has a very important reference value for the energy transfer phenomenon caused by Fermi resonance in materials,geology,biology and other fields.