Kinetics and mechanism of oxidation of (aqua-2-aminomethyl-pyridine) chromium(III) by N-bromosuccinimide |
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Authors: | Ayed S M Al-Shihri Alaa El-Din M Abdel-Hady |
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Institution: | (1) Chemistry Department, Faculty of Education, King Saud University, Abha Branch, Saudi Arabia |
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Abstract: | Summary The kinetics of oxidation of (aqua-2-aminomethyl-pyridine) CrIII by N-bromosuccinimide (NBS) in aqueous solution to yield chromium(VI) has been studied spectrophotometrically over the 25–40 °C
range. The reaction rate is first order with respect to both NBS] and CrIII], and increases with increasing pH between 7.6 and 8.6. The thermodynamic activation parameters were calculated. The experimental
rate law is consistent with a mechanism in which the deprotonated Cr(L)2(OH)]2+ was considered to be the most reactive form compared to its conjugate acid. It is assumed that electron transfer takes place
via an inner-sphere mechanism. |
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