Studies of lanthanide(III) metal complexes of 7-(D-α-aminophenyl-acetamido)-3-methyl-3-cepham-4-carboxylic acid

Eight new solid. complexes of lanthanide(III) chlorides with 7-(D-(alpha-aminophenyl-acetamido)-3-methyl-3-cepham-4-carboxylic acid have been synthesised. These complexes are characterised by elemental analysis, UV and IR spectra, magnetic moment and conductivity data. Inhibitory effect of these complexes and study of antibacterial activity is also undertaken. The IR spectral studies indicate that the ligand acts as tetradentate and it coordinates through nitrogen and oxygen. The general formula of the comples is [LnL(2)(H2O)(2)]Cl, where Ln = La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(III) and Dy(III). L is 7-(D-alpha-aminophenyl-actamido)-3-methyl-3-cepham-4-carboxylic acid. Coordination number of central metal ion is 10. Inhibitory study of complexes on the corrosion of steel alloy in solution of nitric acid has been done. The inhibitor concentrations of 0.5 to 2% in 0.5 N HNO3 were used and it was found that inhibitory efficiency increases in the order metal chloride < ligand < complex. Antibacterial activity of AAMCC ligand increases on complexation with lanthanides.