Abstract
Two oxidovanadium(V) complexes, [VOLLa] (1) and [VOLLb] (2), where L is the dianionic form of the Schiff base ligand 2-(((2-hydroxyethyl)imino)methyl)-6-methylphenol (H2L), La and Lb are the deprotonated forms of 3-hydroxy-2-methyl-4H-pyran-4-one (HLa) and 2-ethyl-3-hydroxy-4H-pyran-4-one (HLb), respectively, have been prepared and characterized by elemental analyses, IR, UV-Vis, 1H NMR and single-crystal X-ray crystallographic determination. The V atoms in the complexes are in octahedral coordination, with the Schiff base ligand mer-coordinated to the metal atoms through the phenolate O, imino N and hydroxyl O atoms, and with the pyrone ligands coordinated to the metal atoms through the two O atoms. The effect of the compounds on the antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Candida albicans was studied.
Highlights
Schiff bases with typical imine group, C=N, are interesting ligands in coordination chemistry.[1]
Two oxidovanadium(V) complexes, [VOLLa] (1) and [VOLLb] (2), where L is the dianionic form of the Schiff base ligand 2-(((2-hydroxyethyl)imino)methyl)-6-methylphenol (H2L), La and Lb are the deprotonated form of 3-hydroxy-2-methyl-4Hpyran-4-one (HLa; maltol) and 2-ethyl-3-hydroxy-4Hpyran-4-one (HLb; ethyl maltol), respectively, are reported
The Schiff base compound H2L was prepared by the condensation of equimolar quantities of 3-methylsalicylaldehyde with 2-aminoethanol in methanol
Summary
Schiff bases with typical imine group, C=N, are interesting ligands in coordination chemistry.[1] In recent years, metal complexes of Schiff bases have attracted remarkable attention due to their versatile biological activity, such as antifungal, antibacterial and antitumor.[2] Schiff base complexes derived from salicylaldehyde and its derivatives with primary amines, bearing the NNO, NNS, NOO or NSO donor sets, have particular biological activities.[3] Pyrone compounds are bidentate ligands in various metal complexes.[4] Most complexes with pyrone ligands have interesting biological properties.[5] In the present work, two oxidovanadium(V) complexes, [VOLLa] (1) and [VOLLb] (2), where L is the dianionic form of the Schiff base ligand 2-(((2-hydroxyethyl)imino)methyl)-6-methylphenol (H2L), La and Lb are the deprotonated form of 3-hydroxy-2-methyl-4Hpyran-4-one (HLa; maltol) and 2-ethyl-3-hydroxy-4Hpyran-4-one (HLb; ethyl maltol), respectively, are reported
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