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Anderson type Hexamolybdochromate (III) catalyzed oxidation of acetic acid hydrazide by KBrO3 in acidic medium

Author Affiliations

  • 1Kinetics and Catalysis Laboratory, Department of Chemistry, Shivaji University Kolhapur 416004, India
  • 2Kinetics and Catalysis Laboratory, Department of Chemistry, Shivaji University Kolhapur 416004, India

Res.J.chem.sci., Volume 6, Issue (4), Pages 17-23, April,18 (2016)

Abstract

The kinetic and mechanistic investigation of Anderson type hexamolybdochromate (III) catalyzed oxidation of acetic acid hydrazide by KBrO3 has been carried out in hydrochloric acid. The order in hydrogen ion was found to be 1.77 due to protonation equilibria of both hexamolybdochromate and hydrazide. Oxidation reaction obeyed first order with respect to bromate, hydrazide and hexamolybdochromate concentrations.The mechanism of reaction involves hydrazide and monoprotonated form of catalyst which is the reactive species in reaction. The initiation of reaction occurs through oxidation of catalyst H[CrIIIMo6O24H6]2- to [O=CrVMo6O24H6]3-, which then reacts with hydrazide to give product without any intervention of free radical. The oxidized from of catalyst [O=CrVMo6O24H6]3- was isolated and characterized by FTIR spectra. The effect of ionic strength and dielectric constant of medium on the reaction was also studied. Moreover the thermodynamic parameters Ea, &

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