Two Vanadium(V) Complexes Derived from Bromo and Chloro-Substituted Hydrazone Ligands: Syntheses, Crystal Structures and Antimicrobial Property

Acta Chim Slov. 2020 Dec;67(4):1281-1289.


Two vanadium(V) complexes derived from the bromo and chloro-substituted hydrazones N'-(4-bromo-2-hydroxybenzylidene)- 2-chlorobenzohydrazide (H2L1) and N'-(3-bromo-5-chloro-2-hydroxybenzylidene)-3-methylbenzohydrazide (H2L2) with the formula [VOL1(OCH3)(CH3OH)] (1) and [VOL2(OCH3)(CH3OH)] (2) were newly synthesized and characterized by IR, UV-Vis and 1H NMR spectroscopy. The structures of H2L1 and the complexes were further confirmed by single crystal X-ray diffraction. Both vanadium complexes are mononuclear, with the metal atoms coordinated by the hydrazone ligands, methanol ligands, and methanolate ligands, and the oxo groups, forming octahedral geometry. The hydrazones and the vanadium complexes were assayed for the antimicrobial activities on Bacillus subtilis, Staphylococcus aureus, Escherichia coli, and Pseudomonas fluorescence, and the fungi Candida albicans and Aspergillus niger. The existence of the bromo and chloro groups in the hydrazone ligands may improve the antimicrobial property.

MeSH terms

  • Anti-Bacterial Agents / chemical synthesis
  • Anti-Bacterial Agents / pharmacology*
  • Antifungal Agents / chemical synthesis
  • Antifungal Agents / pharmacology*
  • Aspergillus niger / drug effects
  • Bacteria / drug effects
  • Candida albicans / drug effects
  • Coordination Complexes / chemical synthesis
  • Coordination Complexes / pharmacology*
  • Hydrazones / chemical synthesis
  • Hydrazones / pharmacology*
  • Ligands
  • Microbial Sensitivity Tests
  • Molecular Structure
  • Vanadium / chemistry


  • Anti-Bacterial Agents
  • Antifungal Agents
  • Coordination Complexes
  • Hydrazones
  • Ligands
  • Vanadium