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Effect of Cetyltrimethylammonium Bromide on the Oxidation of β-Alanine by N-Bromophthalimide in Acidic Medium

  • Y. R. Katre , G. K. Joshi and A. K. Singh
Published/Copyright: April 5, 2013
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Tenside Surfactants Detergents
From the journal Tenside Surfactants Detergents Volume 45 Issue 4

Abstract

The kinetics of the oxidation of β-alanine (Ala) by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 313 K. The oxidation kinetics exhibits first order kinetics with respect to [Oxidant], fractional order of [Ala] and inverse fractional order of [H+] on the rate of reaction. The rate of reaction decreases with decreasing dielectric constant of the medium. The rate constant increases with increasing CTAB and then constant. Increasing [Hg(OAc)2] and inorganic salts i.e. [Cl−] and [Br−] increased the rate of reaction, whereas a change in ionic strength of the medium had no effect on oxidation velocity. Methyl Cyanide as the main oxidation product has been identified. Thermodynamic and activation parameters have been evaluated. The rate constants, binding constants with surfactant (CTAB) and the index of cooperativity have also been evaluated.

Kurzfassung

Die Kinetik der Oxidation von β-Alanin (Ala) mit N-Bromphthalimid (NBP) wurde in Gegenwart eines kationischen Tensids, Cetyltrimethylammoniumbromid (CTAB), bei 313 K untersucht. Die Oxidationskinetik zeigt eine Kinetik erster Ordnung hinsichtlich des [Oxidationsmittels], eine fraktionierte Ordnung von [Ala] und eine invers fraktionierte Ordnung von [H+] bei der Reaktionsgeschwindigkeit. Die Reaktionsgeschwindigkeit sinkt mit abnehmender Dielektrizitätskonstante des Mediums. Die Geschwindigkeitskonstante steigt mit Erhöhung an CTAB und bleibt dann konstant. Mit Erhöhung von [Hg(OAc)2] und anorganischen Salzen, d.h. [Cl−] und [Br−] steigt die Reaktionsgeschwindigkeit an, während eine Änderung der Ionenstärke des Mediums keinen Einfluss auf die Oxidationsgeschwindigkeit hatte. Als Hauptoxidationsprodukt wurde Methylcyanid indentifiziert. Die Thermodynamik- und Aktivierungsparameter sind bewertet worden, ebenso die Geschwindigkeitskonstante, Bindungskonstante mit dem Tensid (CTAB) und der Kooperationsindex.

Key words:: Kinetics; oxidation; β-alanine; binding constant; index of cooperativity
Stichwörter:: Kinetik; Oxidation; β-Alanin; Bindungskonstante; Kooperationsindex
∗ Dr. Y. R. Katre, Department of Chemistry, Kalyan Mahavidyalaya, Bhilai Nagar, Durg, Chhattisgarh, India. 490006, Tel: +91-788-2391124, +91-9826189766, Fax: +91-788-2223352. E-mail:

Dr. Yokraj Katre received his M.Sc. in 1977 from Sagar University, India, and his M.Phil. in 1985 and Ph.D in 1988 from Vikram University, Ujjain, India. He participated in the 8th International Conference of Surfactants and presented a paper at the University of Florida, Gainesville, in 1990. He has been an assistant professor of chemistry in Kalyan P.G. Mahavidyalaya, Bhilai, since 1978. He continues his research related to micellar kinetics, including a current 2 year research project sanctioned by U.G.C. He attended the 233rd American Chemical Society meeting in Chicago, USA and presented an oral paper in the Colloid and Surface Science division in 25 to 29 March 2007. He is a member of American Chemical Society for the year 2007–2008.

Dr. Ajaya K. Singh received his M.Sc. in inorganic chemistry from Poorvanchal University. Jaunpur, India, and his D. Phil. in physical chemistry in 2002 from the University of Allahabad, Allahabad, India. He was selected as an assistant professor of chemistry at Government Science College, Mungeli, Bilaspur, through the M. P. Public Service Commission, Indore in 1994. He presented an oral paper in the 2nd Asian Conference on Colloidal and Interface Chemistry held on Shandong University, Jinan, China. He was awarded a Teacher Research Fellowship to complete his research work in 2000–2002. He is currently assistant professor of chemistry at Government V.Y.T.P.G. Autonomous College, Durg, India, where he continues his research work, which is mainly related to transition metal-ion catalyzed oxidation kinetics as well as micellar oxidation kinetics. He is the author of more than 15 papers related to this field.

Mr. Ghanat K. Joshi received his M.Sc. in physical chemistry in 2001 from Government Arts and Science College, Durg, India, and his M.Phil. in physical chemistry in 2002 from Vikram University, Ujjain, India, under the supervision of Dr. S.K. Solanki. He continues his research work as a research scholar towards a Ph.D. at Kalyan Mahavidyalaya, Bhilai Nagar, India, in the area of micellar oxidation kinetics, under the supervision of Dr. Y.R. Katre. He selected for Rajiv Gandhi National Fellowship from U.G.C., New Delhi, India. He is a member of American Chemical Society for the year 2007–2008.

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Received: 2007-12-27
Published Online: 2013-04-05
Published in Print: 2008-07-01

© 2008, Carl Hanser Publisher, Munich

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https://doi.org/10.3139/113.100379
Keywords for this article
Kinetics; oxidation; β-alanine; binding constant; index of cooperativity

Articles in the same Issue

  1. Contents/Inhalt
  2. Contents
  3. Abstracts
  4. Abstracts
  5. Analysis
  6. Identification of the Products from the Sulfonation of an Oleic Acid Methyl Ester
  7. Application
  8. Study of Adsorption of Sodium Dodecyl Sulfate on Alumina Using Surfactant Ion-selective Electrode
  9. Foaming Power and Foam Stability of Several Alkyl Polyglycosides
  10. Environmental Chemistry
  11. Compositional Analysis and Environmental Performance of LAS Produced from GTL Normal Paraffin and Different Alkylation Routes
  12. A Biodegradation Study of Triethylene Glycol Monododecyl Ether under the Conditions of the OECD Screening Test 301E
  13. Solubilization of PCBs by Surfactant Solution: Minimization of Partitioning Loss of Surfactant
  14. Physical Chemistry
  15. Effect of Cetyltrimethylammonium Bromide on the Oxidation of β-Alanine by N-Bromophthalimide in Acidic Medium
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