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Palladium(II) Catalyzed Oxidation of Glycine by Ferricyanide in Acid Medium: Kinetics and Mechanism

[ Vol. 7 , Issue. 1 ]

Author(s):

Krishna K. Yerneni, Kishore Cholkar, Mridula Guin, Ananth N. Nayak, S. Ananda and Netkal M. Made Gowda   Pages 63 - 70 ( 8 )

Abstract:


Glycine (Gly) is one of the amino acids, commonly found in proteins, coded by codons GGU, GGC, GGA and GGG. Glycine is the unique non-optically active amino acid. The Gly-ferricyanide reaction catalyzed by Pd(II), under pseudo-first-order conditions, has been spectrophotometrically monitored at the ferricyanide λmax of 303 nm at constant temperature. The experimental rate law for the reaction is: rate = kı [Fe(CN)6 3-] [Gly]x [H+]y [Pd(II)]z, where x, y and z are fractional orders. Additionally, the effect on the rate of adding the reduction product, [Fe(CN)6 4-], has been found to be negligible. Variations of the ionic strength and the dielectric constant of the reaction medium have an effect on the rate. Activation parameters have been evaluated using Arrhenius and Eyring plots. A suitable mechanism has been presented and the derived rate law is consistent with the kinetic data.

Keywords:

Acid medium, activation parameters, ferricyanide, glycine, mechanism, oxidation kinetics, palladium(II) catalysis, rate law.

Affiliation:

Department of Chemistry, Western Illinois University, 1 University Circle, Macomb, IL 61455, Department of Chemistry, Western Illinois University, 1 University Circle, Macomb, IL 61455, Pooja Bhagavat Memorial Mahajana PG Centre, University of Mysore, KRS Road, Mysore, 570 016, Pooja Bhagavat Memorial Mahajana PG Centre, University of Mysore, KRS Road, Mysore, 570 016, Department of Studies in Chemistry, University of Mysore, Manasagangothri, Mysore, 570 006, Pooja Bhagavat Memorial Mahajana PG Centre, University of Mysore, Mysore 570 016

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