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Title: Two step one-electron transfer reaction of chromium(III) complex containing carbidopa and inosine with N-bromosuccinimide
Authors: Abdel-Khalek, Ahmed A
Abdel-Hafeez, Mahmoud M
Keywords: Kinetics
Reaction mechanisms
Electron transfer
Issue Date: Aug-2012
Publisher: NISCAIR-CSIR, India
Abstract: Oxidation of [CrIII(CD)(Ino)(H2O)4]2+ (where CD = carbidopa, Ino = inosine) with N-bromosuccinimide (NBS) was studied kinetically in aqueous media over varying ranges of concentrations of complex (1.0-5.0) × 10-4 mol dm-3  and NBS (0.5-5.0) × 10-2 mol dm-3, pH, ionic strength and temperature. The reaction is first order with respect to [CrIII] and [NBS]. The rate of reaction increases with increasing pH over the studied range (6.76-7.84). The anionic surfactant, sodium dodecyl sulphate is found to increase the rate of the oxidation in the range (0.0-1.0) × 10-3 mol dm-3. Thermodynamic activation parameters have also been calculated. The rate of oxidation obeys the equation d[CrVI]/dt = {k3 + k2 (1/[H+])}[NBS][[CrIII(CD)(Ino)(H2O)4]2+]. The experimental rate law is consistent with the proposed mechanism in which the protonated and deprotonated species are involved in the rate determing step. It is proposed that a two step one-electron transfer takes place via an inner sphere mechanism.
Description: 1073-1079
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(08) [August 2012]

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