Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study

Abstract

KEYWORDSThe kinetics of oxidation of triethylene glycol (TEG) and tetraethylene glycol (TTEG) by ditelluratocuprate(III) (DTC) in alkaline liquids were investigated spectrophotometrically in the temperature range of 20 o C to 40 o C. It was found that the reaction followed pseudo-first order in DTC and less than unit order in reductants. The rate constant kobs of pseudo-first order reaction decreased with an increase of [TeO4 2-], whereas adding [OH -] enhanced the constant. In addition, there was a negative salt effect. A suitable assumption involving preequilibriums before the rate controlling step and a free radical mechanism was proposed from the kinetics study. The rate equations derived from mechanism can explain all experimental phenomena. Moreover, the activation parameters at 298.2K and rate constants of the ratedetermining step were evaluated.

The oxidation of 2-(2-methoxyethoxy)-ethanol and 2-(2-ethoxyethoxy)-ethanol by dihydroxydiperiodato nickelate(IV): A kinetic and mechanistic study

“…The equation (11), (15), and (16) are consistent with equation (1), (2), and (3), respectively, which mentioned formerly. This is consistent with the experiments result.…”

“…A large number of studies have showed that: transition metals in a higher oxidation state generally can be stabilized by chelation with suitable polydentate ligands. Metal chelates, such as ditelluratocuprate (III) [1][2][3] diperiodatocuprate (III) [4], diperiodatoargentate (III) [5,6], ditelluratoargentate (III) [7,8], diperiodatonickelate (IV) [9,10] are good oxidants in a medium with an appropriate pH. Ni(IV) complexes have been employed as oxidizing agents for the investigation of some organic compounds.…”

Oxidation of butylamine and isobutylamine by diperodatocuprate(III) in alkaline medium - A kinetic and mechanistic study

“…Diperodatocuprate(III) had been reported by many researches [1][2][3]. It is one-electron oxidants in the study of kinetics and mechanism of various compounds in alkaline medium.…”