Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1196-1202.doi: 10.1007/s40242-020-0050-1

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Supramolecular Assemblies of Three New Metronidazole Derivatives Constructed with Various Dihydroxy-benzoic Acids via Hydrogen Bonds

QU Huiqi, PAN Longhai, SUN Yuexin, WANG Lei, LI Yanyan, ZHANG Mingjuan, ZHANG Zhaoxiang, LIN Haifeng   

  1. Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology, Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
  • Received:2020-03-03 Revised:2020-03-22 Online:2020-12-01 Published:2020-03-26
  • Contact: LI Yanyan, LIN Haifeng E-mail:liyanyan@qust.edu.cn;linhaifeng@qust.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(Nos.21801150, 51802170, 51772162), the Outstanding Youth Foundation of Shandong Province, China(No.ZR2019JQ14), the Youth Innovation and Technology Foundation of Shandong Higher Education Institutions, China(No.2019KJC004), the Taishan Scholar Young Talent Program and the Major Scientific and Technological Innovation Project, China(No.2019JZZY020405).

Abstract: Metronidazole(MTZ) is an important antibiotic, which has been widely applied to cure protozoal and bacterial diseases for human beings or animals. Herein, three novel drug supramolecular crystals constructed by MTZ with 2,5-dihydroxy-benzoic acid(2,5-DHBA)(1), 2,6-dihydroxy-benzoic acid(2,6-DHBA)(2) and 3,5-dihydroxy-benzoic acid(3,5-DHBA)(3), respectively, have been discovered. The hydrogen bonds of N-H···O(O-H···N), C-H···O and O-H···O play important roles in the 3D supramolecular framework formation for crystals 1-3. Interestingly, due to the vary locations of the substituent groups, the two-dimensional layers in crystals 1 or 2 are constructed via intermolecular hydrogen bonds between MTZ and 2,5-DHBA or 2,6-DHBA, while in crystal 3 water molecules play a significant role except the intermolecular hydrogen bonds between MTZ and 3,5-DHBA. In addition, five synthons of I R22(8), II R33(9) in crystal 1, III R12(4), IV R22(8) in crystal 2 and V R22(7) in crystal 3 formed through various hydrogen bonds are founded in this work. Systematic studies of syntheses, crystal structures and thermal analysis are reported.

Key words: Metronidazole, Supramolecular assembly, Hydrogen bond, Thermal stability