Abstract
Complex formation of copper(II) with decanoic acid (HA) has been studied by potentiometric measurement in 1,4-dioxane-water mixtures at a constant ionic concentration of 0.1 mol dm −3 (Na, H)ClO 4 and at 25°C. The experimental data can be interpreted with the formation of CuA +, CuA 2 and Cu 2A 4. The dimerization constant formulated as: ▪ was found to be log K dim = 3.75, 4.02 and 4.26 for 0.3, 0.4 and 0.5 mole fractions of dioxane, respectively. Absorbances at 373 and 670 nm are interpreted with the aid of the formation constants determined by potentiometry. Solvent effect on the dimerization of the monomeric copper(II) decanoate is discussed on the basis of selective solvation of CuA 2 and Cu 2A 4 with water molecules.
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