New vanadium and zinc complexes with schiff base ligand N,N′-bis(3-ethoxy-2-hydroxybenzylidene)ethylenediamine: Synthesis, structures, and biochemical properties

The Schiff base ligand N,N′-bis(3-ethoxy-2-hydroxybenzylidene)ethylenediamine (H2L) reacting with vanadyl acetylacetonate and zinc chloride, respectively, in methanol gave the complexes [VOL] · H2O (I) and [ZnL(OH2)] (II). Both complexes were characterized by elemental analyses and IR spectroscopic method in the solid state. Single crystal X-ray analysis was performed, which reveals that both of them are mononuclear complexes. Complex I crystallizes in the monoclinic space group P21/c with unit cell dimensions a = 9.4387(7), b = 16.996(1), c = 12.758(1) Å, β = 98.269(2)°, V = 2025.4(3) Å3, Z = 4, R1 = 0.0365, and wR2 = 0.0946. Complex II crystallizes in the tetragonal space group \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$P\overline {42} _{1m} $\end{document} with unit cell dimensions a = b = 22.0489(8), c = 4.9846(4) Å, V = 2423.3(2) Å3, Z = 4, R1 = 0.0890, and wR2 = 0.2278. The V atom in I and the Zn atom in II are in square pyramidal coordination. Anbacterial activities of the Schiff base ligand and the complexes have been studied on the strains B. subtilis, E. coli and S. aureus.