Kinetics and mechanism of the oxidation of a ternary complex involving nitrilotriacetatocobaltate(II) and succinic acid by N-bromosuccinimide |
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| Authors: | Abdel-Khalek Ahmed A Ewais Hassan A Khaled Eman SH Abdel-Hamied Anwar |
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| Institution: | (1) Chemistry Department, Faculty of Science at Beni-Suef, Cairo University, Beni-Suef City, Egypt |
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| Abstract: | The kinetics of oxidation of CoIINS(H2O)2]3– by N-bromosuccinimide (NBS) in aqueous solution has been studied spectrophotometrically in the 20–40 °C range. The reaction is first order each in NBS] and CoIINS(H2O)2]3–, and the rate of reaction increases with increasing pH between 6.64 and 7.73. The thermodynamic activation parameters have been calculated. The experimental rate law is consistent with a mechanism in which the deprotonated CoIINS(H2O)(OH)]4– is considered to be the most reactive species compared to its conjugate acid. It is assumed that electron transfer takes place via an inner-sphere mechanism. |
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