Lanthanum (III) complexes of thiocarbohydrazones

Several complexes of Lanthanum (III) with thiocarbohydrazones have been synthesized and characterized by elemental analysis and spectral data. The complexes have 1: 1 stoichiometry of the typeLa.L.NO3 H2O, La.L.Cl.H2O and La.L.NCS.H2O where 'L' represents doubly degenerated ligand. The IR spectral data suggest that, the ligands have coordinated through azomethine nitrogen atoms and reacted through hydroxyl groups via deprotonation. The PMR spectral data support the IR inferences. On the basis of these observations it is suggested that La (III) complexes exhibit co-ordination number seven in the complexes of the type La.L.NO3.H2O and six in the type of; La.L.Cl.H2O and La.L.NCS.H2O complexes. All the ligands and their La (III) complexes have been screened for their antibacterial and antifungal activities against bacteria and fungi.