Abstract

INVESTIGATION OF EFFECT OF TEMPERATURE AND MEDIUM ON COMPLEXATION OF DY (III) WITH 5-BROMO, 2-HYDROXY ACETOPHENONE

Sanjay B. Ubale*, Sangeeta P. Pawar, Manish S. Adhyapak, Dinesh L. Lingampalle and Rajendra P. Pawar

ABSTRACT

The present study deals with the interactions of Dy (III) with 5-bromo, 2-hydroxy acetophenone at different temperatures (30, 40, 50, & 600C). The stability constants of them were determined at 0, 25, 50 & 75% dioxane-water mixture solution. Bjerrum – Calvin method was employed for pH-metric data for the calculation of proton-ligand and metal ligand stability constants. The systems were studied by maintaining M: L ratio 1:1 & 1:2. The metal-ligand stability constant increases with the dioxane percentage. Increase in pK values and metal-ligand stability constants could be due to the decrease in dielectric constant of medium, effect of bulk solvent and specific solute-solvent interactions, also, the pK values decrease with increasein temperature.

Keywords: Dysprosium (III), 5-bromo-2-hydroxy acetophenone, complexes, stability constant.