Kinetic and mechanistic study of oxidation of cystine by hexacyanoferrate(III) ions catalyzed by Ir111 in aqueous alkaline medium
| Main Authors: | Anjali Goel, Savita Gupta |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2011
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5771420 |
Daftar Isi:
- Department of Chemistry, Kanya Gurukul Mahavidyalaya, Gurukul Kangri University, Hardwar-249 407, Uttrakhand, India E-mail : goelanjali@yahoo.com Manuscript received 07 April 2010, revised 15 June 2010, accepted 15 June 2010 The iridium(lll) catalyzed hexacyanoferrate(lll) (abbreviated HCF(m)) oxidation of cystine In aqueous alkaline medium has been investigated spectrophotometrically. The reaction is found nrst order in oxidant, catalyst and alkali concentration while with substrate concentration reaction follows Michaelis-Menten type kinetics. Positive salt effect was observed by using the potassium chloride solution. Different activation parameters were also evaluated by studying the reaction at four different temperatures. The stoichiometry of the reaction was found 1 : 8 of reductant and oxidant. A suitable mechanism has been proposed to explain all the experimental results. It is assumed that reaction proceeds through complex formation between substrate (abbreviated S) and iridium trichloride. A rate law has been derived which verifies the results.