PREPARATION OF MIXED LIGAND COMPLEXES OF LANTHANIDE METAL, THEIR CHARACTERIZATION AND ANTIBACTERIAL STUDY

The new mixed ligand complexes of the Cerium metal are obtained by using (2Z)-2-(N-hydroxyimino)-1, 2-diphenylethan-1-ol as a primary ligand and various amino acids like L-Arginine, L-Glutamine, L-Asparagine as a secondary ligand .The analysis of synthesized complexes has been carried out on the basis of elemental analysis, magnetic susceptibility measurements, electrical conductance details, UV-Visible and IR spectrophotometric measurements, TG DTA studies. All new complexes are formed in the ratio of 1:2:1 which is finalized by elemental analysis. Paramagnetic nature of the new synthesized Ce (III) complexes has been confirmed by magnetic susceptibility measurements. Electrical conductance studies clears their non-electrolytic nature. FTIR spectra shows that the Cerium(III) metal ion is bonded to primary ligand and secondary ligand through donor atoms which are N and O atomes present in the given ligands, while intra ligand and LCMT transitions are proved by electronic absorption spectra of the complexes. The thermal studies of complexes reveal the presence of coordinated H2O molecules, metal ion and primary as well as secondary ligand in the synthesized complexes. Antibacterial activity of all the complexes studied against selective microorganisms S. typhi, P. aeruginosa, S. aureus, C. diphtheriae by Tube dilution and Agar cup methods exposes that the complexes have moderate activity against the chosen microorganism strains.