Synthesis, characterization and crystal structures of oxovanadium(V) complexes derived from similar aroylhydrazone ligands

Abstract

Reaction of [VO(acac)₂] (acac = acetylacetonate) with N’-(5-chloro-2-hydroxybenzylidene)-3-methoxybenzohydrazide (H₂L¹) and N’-(2-hydroxy-4-methoxybenzylidene)-4-nitrobenzohydrazide (H₂L²) in methanol affords methanol-coordinated mononuclear oxovanadium(V) complexes, [VOL¹(OMe)(MeOH)] (1) and [VOL²(OMe)(MeOH)] (2), respectively. The complexes were characterized by elemental analysis, FT-IR, ¹H NMR and ¹³C NMR spectra. Crystal and molecular structures of the complexes were determined by single crystal X-ray diffraction method. Single crystal X-ray structural studies indicate that the hydrazone ligands coordinate to the VO core through enolate oxygen, phenolate oxygen and azomethine nitrogen. The V atoms in the complexes are in octahedral coordination. Thermal stabilities of the complexes have also been studied.

KEY WORDS: Oxovanadium complex, Aroylhydrazone ligand, Crystal structure, X-ray diffraction, Thermal property

Bull. Chem. Soc. Ethiop. 2015, 29(3), 423-430.    

DOI: http://dx.doi.org/10.4314/bcse.v29i3.10