Periodate Oxidation of a Ternary Complex of Nitrilotriacetatochromium(III) Involving ß-Alanine as Co-Ligand

• 作者: Ahmed H. Abdel-Salam Amal S. Basaleh Hassan A. Ewais Mohamed A. Habib
• 来源期刊: 无机化学期刊(英文)
• 学科: 化学
• 关键词: Nitrilotriacetatochromium(III) TERNARY Complex PERIODATE Oxidation Inner-Sphere Mechanism THERMODYNAMIC Activation Parameters
• 年，卷（期）: 2018,（4）
• 页码范围: 91-104
• 页数: 14页
• 分类号: O6

摘要

The kinetics of the periodate oxidation of chromium(III)-complex, [CrIII(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, [CrIII(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).