Spectroscopic and Antimicrobial Studies of Some Metal Complexes of Furfural Schiff Base Derivative Ligand

A new furfural Schiff base derivative ligand (L-FSB) named N-(۴-Bromo-۲-methylphenyl)-۱-(furan-۲-yl)methanimine, was synthesized from the condensation reaction of furfural (fur) with ۴-Bromo-۲-methylaniline (bma) in ۱:۱molar ratio. A new series of VO(II), Cr(III), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) metal complexes are synthesized according to the metal content analysis in an ۲:۱ ligand:metal ratio. The stereochemistry of the ligand complexes have been deduced by Fourier Transform-Infra Red (FT-IR), Atomic Adsorption (A.A), Ultra violate-Visible Spectra (UV-Vis Spectra), (Mass Spectra, Proton,۱۳Carbon-Nuclear Magnetic Resonance) (۱H-NMR,۱۳C-NMR) for ligand), magnetic susceptibility at ۲۵oC and conductivity measurements. From the FT-IR data the coordination behavior of the ligand is a neutral monodentate ligand coordinate to the metal ions through azometane nitrogen. Electronic spectra analysis study revealed that the suggested geometrical structure of all complexes are distorted octahedral geometry except Zn(II) and Cd(II) complexes are tetrahedral and this study was confirmed by magnetic moment and conductance measurements. The antimicrobial activities of the synthesized Schiff base ligand and its complexes were screened against three pathogenic microbes: Escherichia coli (Gram-negative bacteria), Staphylococcus aureus (Gram-positive bacteria), and fungal strains (Candida albicans) were identified the most efficient biologically active compounds. The results of studies showed that potential is related to the structure and nature of ligand and their complexes.

Keywords:

Furfural ۴ , Bromo , ۲ , methylaniline Schiff base Metal complexes Spectroscopic Antimicrobial activity