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8.
Mechanistic study of Ir(III)catalysed oxidation of citric acid by
acidic solution of N-chlorosuccinimide:A kinetic approach
Rishikesh Dubey* and R.A. Singh
Chemical kinetics Research
Laboratories, Chemistry Department, T.D.P.G.College, Jaunpur- 222002
(India)
Corresponding Author:
dubey.rishi1@gmail.com
Abstract:
Kinetics of Ir(III) catalysed oxidation of citric
acid (CA) by N-chlorosuccinimide (NCS) in the presence of
perchloric acid has been investigated in the temperature range
of 300C to 450C. The reaction shows
complex kinetics, being zero order in (CA) and first order in
both (NCS) and [Ir (III)]. First order kinetics with respect to
[H+] was observed. Addition of chloride ions in the
form of various amounts of KCl indicated positive effect of
[Chloride] ions on the rate. Addition of various amounts of
succinimide (reduction product of NCS) and increase in ionic
strength of the medium showed negative effect on the rate of the
reaction. Activation parameters have been calculated and
reported. Mechanistic steps have been discussed and rate law
consistent with observed kinetics has been derived.
Keywords:Kinetics, mechanism, oxidation, N-chlorosuccinimide,
citric acid, Ir(III) chloride
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