Kinetics and mechanism of the oxidation of a ternary complex of cobalt(II) involving nitrilotriacetate and benzoate by periodate in acetate medium. Evidence for manganese(II) as a catalyst

摘要

Kinetics of the oxidation of [CoII(nta)(bz)(H₂O)₂]2− (nta = nitrilotriacetate and bz = benzoate) by periodate in acetate medium have been investigated spectrophotometrically at 580 nm under pseudo first order condition by taking large excess of over the 15.0-35.0°C range at pH = 4.99 and I = 0.50 M. The kinetics in acetate medium obeyed the rate law: Also, the oxidation of [CoII(nta)(bz)(H₂O)₂]2− by periodate in the presence of Mn(II) as a catalyst was carried out. The rate of reaction increases as the concentration of Mn(II) increases. Initial cobalt(III) products were formed and slowly converted to final products, fitting an inner-sphere mechanism. The enthalpy and entropy of activation were measured using the transition state theory equation.View full textDownload full textKeywordsKinetic studies, Nitrilotriacetic acid, Ternary complexes of cobalt(II), Periodate oxidation, Thermodynamic activation parametersRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/00958970802381190