Equilibrium studies of Eu, Pr and Dy have been carried out potentiometrically with chalcones 1-(2'-hydroxy-5'-methyl) phenyl-2-butene-1 -one and 1'-(2'-hydroxy-3'-nitro-5'-methyl) phenyl-2-butene-1-one in 50 v/v dioxane-water mixture at 35℃ and 0.1 M KNO_3. The equilibria have been investigated by Irving-Rossotti Method. The ligand in uncomplexed and complexed state have been screened for their antimicrobial activities.
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