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PH- METRIC INVESTIGATION ON MIXED LIGAND COMPLEXES OF Cr(III), Th(III) & Nd(III) WITH SUBSTITUTED ISOXAZOLINES IN 70% DIOXANE – WATER MIXTURE
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The complex formation between Cr(III),Th(III),&Nd(III) metal ions and 3-(2-hydroxy-3-nitro-5-methylphenyl)-5-(4-methoxyphenyl)isoxazoline [HNMP4MI] L1, 3-(2-hydroxy-3-nitro-5-methylphenyl)-5-(phenyl)isoxazoline [HNMP5PI] L2 have been studied at 0.1M Ionic Strength (260.1)oC in 70% Dioxane water mixture by Bjerrum method as adopted by Calvin & Wilson.It is observed that Cr(III)&Th(III)&Nd(III)metal ions form 1:1 & 1:2 complexes with ligand L1&L2.The data obtained were used to estimate & compare the values of proton ligand stability constant (pK) & metal ligand stability constant (log K).From estimated data (pK & log K),the effect of substituents were studied.ddd