Kinetics and Mechanistic Studies of Oxidation of Tartaric Acid by diperiodatocuprate(III) in Aqueous Alkaline Medium
- April 13, 2018
- Posted by: RSIS
- Category: Chemistry
International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue III, March 2018 | ISSN 2321–2705
Santosh B. Konnur and Sharanappa T. Nandibewoor*
P.G. Department of Studies in Chemistry, Karnatak University, Dharwad-580003, India
*Corresponding author: Sharanappa T. Nandibewoor
Abstract: – The kinetics of oxidation of tartaric acid (TA) by diperiodatocuprate(III) (DPC) in aqueous alkaline medium at a constant ionic strength of 0.05 mol dm-3 was studied spectrophotometrically. The main oxidation product was identified as methanal (HCHO). The stoichiometry was found to be 1:2 ([TA] : [DPC]). The order of reaction with respect to [DPC] and [TA] was unity. The rate decreased with increase in [OH-] and [IO4-] over the concentration range studied. The ionic strength and dielectric constant of the medium did not affect the rate significantly. Based on the experimental results, a possible mechanism involving free radicals was proposed. The activation parameters were determined and discussed. Kinetics study suggests that the active species of DPC is found to be monoperiodatocuprate(III), [Cu(OH)2(H3IO6)]-.
Keywords: Oxidation, Diperiodatocuprate(III), Tartaric acid, Spectroscopy; Kinetics
I. INTRODUCTION
Tartaric acid (TA) and its derivatives have a plethora of uses in the field of pharmaceuticals. For example, it has been used in the production of effervescent salts, in combination with citric acid, to improve the taste of oral medications [1]. The potassium antimonyl derivative of the acid known as tartar emetic is included, in small doses, in cough syrup as an expectorant. Tartaric acid also has several applications for industrial use. The acid has been observed to chelate metal ions such as calcium and magnesium. Therefore, the acid has served in the farming and metal industries as a chelating agent for complexing micronutrients in soil fertilizer and for cleaning metal surfaces consisting of aluminium, copper, iron, and alloys of these metals, respectively [2].
