Author(s)

Hassan A. Ewais^1*, Ahmed H. Abdel-Salam², Amal S. Basaleh¹, Mohamed A. Habib³

¹Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, KSA.
²Chemistry Department, Faculty of Science, University of Jeddah, Jeddah, KSA.
³Chemistry Department Faculty of Science, Al-Tahadi University, Serit, Lybia.

The kinetics of the periodate oxidation of chromium(III)-complex, [Cr^III(NTA)(Ala)(H₂O)]-(NTA = Nitrilotriacetate and Ala = ß-alanine) to Cr(VI) have been carried out for the temperature range 15°C - 35°C under pseudo-first order conditions, >> [complex]. Reaction obeyed first order dependence with respect to and [Cr(III)], and the rate of reaction increases with increasing of pH for the range 3.40 - 4.45. Experimentally, the mechanism of this reaction is found to be consistent with the rate law in which the hydroxo species, [Cr^III(NTA)(Ala)(OH)]^2- is considerably much more reactive than their conjugate acid. ΔH* and ΔS* have been calculated. It is proposed that electron transfer occurs through an inner-sphere mechanism via coordination of to chromium(III).

Nitrilotriacetatochromium(III), Ternary Complex, Periodate Oxidation, Inner-Sphere Mechanism, Thermodynamic Activation Parameters

Ewais, H. , Abdel-Salam, A. , Basaleh, A. and A. Habib, M. (2018) Periodate Oxidation of a Ternary Complex of Nitrilotriacetatochromium(III) Involving ß-Alanine as Co-Ligand. Open Journal of Inorganic Chemistry, 8, 91-104. doi: 10.4236/ojic.2018.84008.