Metal-ligand stability constants of Th(III), Sm(III), Nd(III) and Pr(III) metal ion complexes with 2-mercapto-4-substituted phenyl-6-substituted phenyl pyrimidines at 0.1 M ionic strength pH metrically

Sumer D. Thakur; Devidas.T.Mahajan; Kamlesh P.Munot; Rajesh D. Deshmukh; Mangesh S.Tihile

Abstract

Metal-ligand stability constants of Th(III), Sm(III), Nd(III) and Pr(III) metal ion complexes with 2-mercapto-4-substituted phenyl-6-substituted phenyl pyrimidines at 0.1 M ionic strength pH metrically

Author(s): Sumer D. Thakur, Devidas.T.Mahajan, Kamlesh P.Munot, Rajesh D. Deshmukh, Mangesh S.Tihile

The interaction between Th(III), Sm(III), Nd(III) and Pr(III) Metal Ions And 2-Mercapto-4-(4’- Aminophenyl)-6-(2’-Hydroxy-5’-Bromophenyl)Pyrimidine[M4AHBP](L1) and 2-Mercapto-4-(2’- Chlorophenyl)-6-(2’-Hydroxy-5’-Bromophenyl)Pyrimidine[M2CHBP](L2) have been studied at 0.1 M Ionic Strength in 70 % Dioxane-water mixture by Bjerrum method as adopted by Calvin and Wilson. It is observed that Th(III), Sm(III), Nd(III) and Pr(III) Metal ions form 1:1 and 1:2 complexes with ligands (L1 & L2). The data obtained were used to estimate and compare the values of proton-ligand stability constant (pK) and metal-ligand stability constants (log k). From estimated data (pK and log k), the effects of substituents were studied.

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