Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (10): 20220354.doi: 10.7503/cjcu20220354

• Physical Chemistry • Previous Articles     Next Articles

Spectroscopic and Theoretical Studies on 5-Mercapto-1,3,4-thiadiazole-2-thione Microsolvation Clusters

WANG Yuanyue, AN Suosuo, ZHENG Xuming, ZHAO Yanying()   

  1. Department of Chemistry,Zhejiang Sci?Tech University,Hangzhou 310018,China
  • Received:2022-05-18 Online:2022-10-10 Published:2022-07-13
  • Contact: ZHAO Yanying E-mail:yyzhao@zstu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21473162)

Abstract:

Microsolvation effect, namely solvation process, widely exists in all physical, chemical and life processes. In the liquid phase chemical reaction system, microsolvation effect is most fundamental for almost all chemical reactions. Crystalloid 5-mercapto-1,3,4-thiadiazole-2-thione(MTT) was characterized as thiol-thione monomer by Fourier transform Raman(FT-Raman) combined with density functional theoretical(DFT) calculation. Both the size and hydrogen bond sites of microsolvation clusters were confirmed in acetonitrile, methanol and water. UV-Vis absorption spectroscopic experiments revealed the effect of solvents and pH on the structures of MTT. Combined with density functional theory(DFT) calculations, the hydrogen bonding interactions between MTT and solvents contributed to the shifts of spectrum indicated. The MTT clusters in acetonitrile, methanol and water were preliminarily determined as MTT(CH3CN), MTT(CH3OH)2 and MTT(H2O)2 by optimizing the possible hydrogen-bonding cluster structures and calculating the total binding energy and average binding energy.

Key words: 5-Mercapto-1, 3, 4-thiadiazole-2-thione(MTT), Raman spectroscopy, UV-Vis absorption spectroscopy, Microsolvent clusters, Density functional theory(DFT)

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