Synthesis, Characterisation and Antimicrobial Studies of Hg(II) and Pb(II) Complexes with Schiff Base Ligand

Metal Complexes of Hg(II) and Pb(II) with Schiff base derived from condensation of 2-hydroxy-1-naphthadelyde with 1,8- diaminonaphthalene and 2-hydroxybenzaldehyde were synthesized and characterized by elemental analysis, m.pt, IR. UV- visible and HNMR Spectroscopy. The ѵ(C = N) stretching vibration was observed at 1635 cm-1 in the spectra of the ligand the band shifted to a higher frequency in the complexes compared to the ligand indicating an increase in the C = N bond order due to the coordination of the metal with the imine nitrogen lone pair. In HNMR the phenolic O-H signal appeared in the spectrum of (HL) at δ10.08 ppm as a broad singlet peak. The molar conductivity of the complexes showed low conductance values this indicates that the compounds are non-electrolyte. The Schiff base ligand and the metal complexes were screened against four bacteria stain (Staphylococcus aureus, Streptococcus pyogene, Escherichia coli and Klebsielia pneumonia) and two fungi (Candida albicans and Aspergilllus niger). The results of the microbial screening showed that Hg(II) complex found to be the most active against all isolates.