Synthesis, Spectral Characterization, Crystal Structure and Antibacterial Activity of dichloro-{2-[(4-fluorophenyl)iminomethyl]pyridine-κ2N,N'}mercury(II)

Abstract

The title complex has been prepared using (4-Fluoro-phenyl)-pyridin-2-ylmethylene-amine bidentate Schiff base ligand (L) and HgCl2. The Hg(II) center in the title compound, [HgCl2(C12H9FN2)], is covalently bonded to three Cl atoms and two N atoms of the diimine ligand. Mercury ion mononuclear fragment that forms a polymeric structure due to bridging chloride ligands is in a distorted trigonal–bipyramidal coordination environment formed by the bis-chelating N-heterocyclic ligand, two bridging Cl ligands and one terminal Cl ligand. One of the bridging Hg—Cl bonds is significantly longer than the other. In the crystal, weak C—H.....Cl hydrogen bonds are observed in addition to π-π stacking interactions. It crystallizes in the Orthorhombic space group P212121 with a = 7.2248 (3) Å, b = 8.7713 (3) Å, c = 20.0217 (7) Å, α = 90.00°, β = 90.00, γ = 90.00°, V = 1268.79(8) Å3, R1 = 0.023 and wR2= 0.062 [I > 2σ(I)] respectively. The antibacterial activities of the complex, ligand and metal salt were tested against Gram-positive bacteria Staphylococcus aureus and Gram-negative bacteria Escherichia coli studied by disk diffusion method.