European Journal of Chemistry 2013, 4(3), 203-206. doi:10.5155/eurjchem.4.3.203-206.778

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


Jinhuan Shan (1,*) , Yi Li (2)

(1) College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
(2) College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
(*) Corresponding Author

Received: 20 Mar 2013, Accepted: 23 Apr 2013, Published: 30 Sep 2013

Abstract


The 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 20oC to 40oC. 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 [TeO42-], whereas adding [OH-] enhanced the constant. In addition, there was a negative salt effect. A suitable assumption involving pre-equilibriums 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 rate-determining step were evaluated.

4_3_203_206

Keywords


Kinetic; Oxidation; Mechanism; Triethylene glycol; Tetraethylene glycol; Ditelluratocuprate(III)

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DOI: 10.5155/eurjchem.4.3.203-206.778

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Citations

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[1]. Jinhuan Shan, Ziwei Zhang
The oxidation of 2-(2-methoxyethoxy)-ethanol and 2-(2-ethoxyethoxy)-ethanol by dihydroxydiperiodato nickelate(IV): A kinetic and mechanistic study
European Journal of Chemistry  5(2), 237, 2014
DOI: 10.5155/eurjchem.5.2.237-240.981
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[2]. Jinhuan Shan, Qianqian Wang
Oxidation of butylamine and isobutylamine by diperodatocuprate(III) in alkaline medium - A kinetic and mechanistic study
European Journal of Chemistry  6(2), 174, 2015
DOI: 10.5155/eurjchem.6.2.174-177.1232
/


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How to cite


Shan, J.; Li, Y. Eur. J. Chem. 2013, 4(3), 203-206. doi:10.5155/eurjchem.4.3.203-206.778
Shan, J.; Li, Y. Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study. Eur. J. Chem. 2013, 4(3), 203-206. doi:10.5155/eurjchem.4.3.203-206.778
Shan, J., & Li, Y. (2013). Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study. European Journal of Chemistry, 4(3), 203-206. doi:10.5155/eurjchem.4.3.203-206.778
Shan, Jinhuan, & Yi Li. "Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study." European Journal of Chemistry [Online], 4.3 (2013): 203-206. Web. 17 Sep. 2019
Shan, Jinhuan, AND Li, Yi. "Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study" European Journal of Chemistry [Online], Volume 4 Number 3 (30 September 2013)

DOI Link: https://doi.org/10.5155/eurjchem.4.3.203-206.778

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