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Kinetics and Mechanism of Oxidation of Chromium(III)‐guanosine 5‐Monophosphate Complex by Periodate
Author(s) -
Ewais Hassan A.,
Ahmed Samah A.,
AbdelKhalek Ahmed A.
Publication year - 2004
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200400108
Subject(s) - chemistry , periodate , chromium , guanosine , kinetics , guanosine monophosphate , aqueous solution , inner sphere electron transfer , electron transfer , inorganic chemistry , medicinal chemistry , nucleotide , ion , organic chemistry , biochemistry , physics , quantum mechanics , gene
The kinetics of oxidation of the chromium(III)‐guanosine 5‐monophosphate complex, [Cr III (L)(H 2 O) 4 ] 3+ (L = guanosine 5‐monophosphate) by periodate in aqueous solution to Cr VI have been studied spectrophotometrically over the 25–45 °C range. The reaction is first order with respect to both [IO 4 − ] and [Cr III ], and increases with pH over the 2.38–3.68 range. Thermodynamic activation parameters have been calculated. It is proposed that electron transfer proceeds through an inner‐sphere mechanism via coordination of IO 4 − to chromium(III).
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