RESUMEN
A new series of rare earth complexes of the Schiff base 4– hydroxybenzilidene–2–aminophenol having the general formula [Ln(HL)2(H2O)3]NO3 have been synthesised and characterized by elemental analysis, conductance studies, infrared and electronic spectral analysis and magnetic studies. The Schiff base and the complexes were screened for their biological activity against the bacteria, E.coli, B.subtilis, S.aureus and P.aeruginosa and the algae, Oscillaforia subrivis and Chlorella pyrenoiclosa. All the complexes were highly active against the bacterial species; Schiff base being less active comparatively. Algal growth was effectively inhibited by the ligand and the complexes, exhibiting total inhibition against the unicellular green algae, Chlorella pyrenoiclosa.