Syntheses, Crystal Structures, and Antibacterial Activity of Mononuclear Vanadium(V) Complexes with Aroylhydrazone and Pyrone as Mixed Ligands

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Two mononuclear vanadium(V) complexes, [VOL¹(KA)] (I) and [VOL²(EM)] (II), where L¹ and L² are the dianionic form of N'-(3-ethoxy-2-hydroxybenzylidene)-4-methoxybenzohydrazide (H₂L¹) and 4-bromo-N'-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide (H₂L²), respectively; KA and EM are the monoanionic form of kojic acid and ethyl maltol, respectively, were prepared. The complexes were characterized by elemental analysis, IR and UV-Vis spectra, and single crystal X-ray determination (CIF files CCDC nos. 1823339 (I) and 1823341 (II)). The crystal of complex I crystallizes in the triclinic space group P^–1 with unit cell a = 7.7813(16), b = 11.297(2), c = 14.3390(18) Å, α = 90.449(2)°, β = 100.402(2)°, γ = 108.366(2)°, V = 1173.8(4) ų, Z = 2. The crystal of complex II crystallizes in the monoclinic space group P2₁/n with unit cell a = 8.6935(5), b = 30.9695(18), c = 18.4469(11) Å, β = 99.366(2)°, V = 4900.3(5) ų, Z = 8. The V atoms in the complexes are in octahedral geometry. The antimicrobial activities of the compounds against K. pneumoniae, S. aureus, P. aeroginosa, E. coli, and B. subtilis were investigated.