Spectroscopic Study for Kinetic and Mechanist...

Spectroscopic Study for Kinetic and Mechanistic Determination for Oxidation of Benzoic Acid Hydrazide by Ammonium Metavanadate

Author Name : Dr. Sanjay Vishnu Pore

ABSTRACTS Chemical kinetics deals with the rate at which the chemical reactions take place and the influence of various factors such as concentration, temperature, pressure catalysts etc., on the reaction rates. Different chemical reactions occur at different rates. Hydrazides are derivatives of carboxylic acids. They have been extensively used in various fields of chemistry; therefore it is pertinent to understand the mechanism of their oxidation. Literature survey reveals that kinetics of oxidation of by vanadium (V) is not extensively studied. Therefore kinetic study of benzoic acid hydrazide by vanadium (V) was undertaken. The reactions between vanadium (V) and Benzoic acid hydrazide (BAH), were studied in sulphuric acid medium under pseudo first order condition. The formation of complex between the reactants, which decomposes in the subsequent step to give products. The reaction proceeds by one electron transfer with intervention of free radical. Increase in hydrazide concentration has no effect on the specific rate. Increase in acid concentration increases the reaction rate and decreases with decrease in dielectric constant. The effect of temperature was studied between 30 to 55 oC. The activation parameters were determined and the values support the proposed mechanism as evidenced by considerable decrease in e ntropy of activation. (-ΔS # = 156.71, J K-1 mol-1