Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (5): 932.doi: 10.7503/cjcu20180648

• Physical Chemistry • Previous Articles     Next Articles

Study on Raman Spectroscopy Non-coincidence Effect of Propionic Anhydride C=O Vibration Mode

LIU Qiuna, XU Wenwen, LIU Maozhu, WANG Huigang*(), ZHENG Xuming   

  1. School of Science, Key Laboratory of Advanced Textiles Materials and Manufacture Technology of the Ministry of Education, Engineering Research Center for Eco-Dyeing and Finishing of Textiles of the Ministry of Education, Zhejiang Sci-TechUniversity, Hangzhou 310018, China
  • Received:2018-09-21 Online:2019-05-06 Published:2019-01-09
  • Contact: WANG Huigang E-mail:zdwhg@163.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21473161, 21873084) and the Zhejiang Provincial Natural Science Foundation, China(No.LZ17B030001)

Abstract:

According to the isotropic and anisotropic Raman spectroscopy of C=O vibration and the characteristics of infrared spectroscopy, the local ordered vibration and coupling mechanism of propionic anhydride molecules were studied. The isotropic and anisotropic Raman spectra of different concentrations of propionic anhydride were determined by three-stage confocal Raman microspectroscopy. The spectra of propionic anhydride in carbon tetrachloride and methanol and the spectra in other solvents were collected. Concentration effects, solvent effects, and Raman spectroscopy non-coincidence effects(NCE) of propionic anhydride were analyzed in detail. The results show that the NCE effect of propionic anhydride decreases with decreasing concentration; the NCE value increases with the decreasing of solvent polarity. The geometrically stable configuration of propionic anhydride monomer and dimer was calculated by the density functional theory B3LYP-D3/31-311G(d, p) basis set. The NCE effect, concentration effect and solvent effect of propionic anhydride molecule were explained by the aggregation state theory model. The theoretical calculation results are in agreement with the experimental results.

Key words: Propionic anhydride, Aggregate state theory model, Raman non-coincidence effect(NCE), Density functional theory(DFT)

CLC Number: 

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