pH-Metric Study on Determination of Metal-Ligand Stability Constants of some Substituted Isoxazoles

Abstract

The interaction of Cu(II), Co(II), fe(III), Al(III) and Nd(III) with 3-(2''-hydroxy-3''-nitro-5'' methylphenyl)-5-phenyl isoxazole (Ligand-1), 3-(2''-hydroxy-3''-nitro-5''-methylphenyl)-5-(4'-methoxyphenyl)-isoxazole(Ligand-II), 3-(2''-hydroxy-3''-nitro-5'' methylphenyl)-5-(3'-nitrophenyl)-isoxazole(Ligand-III) and 3-(2''-hydroxy-3''-nitro-5'' methylphenyl)-5-(3', 4'-methylene dioxyphenyl)-isoxazole (Ligand-IV) have been studied by spectrophotometric technique at 0.1 M ionic strenghth and (30±0.1° c) in 70 % dioxane-water mixture. The data obtained were used to estimate the values of metal-ligand stability constant of substitututed isoxazolines. Spectrophotometric investigation of Co(II), Cu(II), Fe(III), Al(III) and Nd(III) complexes with Ligand(I), Ligand (II), Ligand (III) and Ligand(IV) showed l:l and l:2 complex formation simultaneously. The information of complexes has been studied by Calvin-Bjerrum titration technique. The results obtained of stability constants are in good agreement.