Untitled

Abstract

New complexes of La (III) and Nd (III) with bidentate Schiff base ligands, 1-H indole-(2, 3-dione) hydrazinecarbothioamide (L1H), 1-H indole-(2, 3-dione) hydrazinecarboxamide (L2H) have been synthesized and characterised. The stoichiometry of the complexes is originated in the type of [Ln (L1, 2) 3 ].3H 2 O for both metals. The characterization and nature of bonding of these complexes were elucidated by elemental analysis, melting point, molecular weight determinations, electronic spectra, redox behavior, magnetic and EPR studies, IR, 1 H and 13 C NMR spectral studies. From an elemental analysis, the complexes are in 1:3 (metal: ligand). Whole studies propose non-electrolytic behaviour and an octahedral geometry of Ln (III) complexes. La (III) and Nd (III) metal complexes and their parent ligands tested antimicrobial potency invitro, and the result indicates that metal complexes are more active than parent ligands. Experimental: All chemical and solvent used in experiments are of AR grade. All the metals used are in the form of hydrated lanthanide (III) chloride (LnCl 3 .6H 2 O). The molecular weights were determined by the Rast camphor method using resublimed camphor (m.p. 178 ºC). Infrared spectra of the ligands and their metal complexes were