Influence of TTAB/14-S-14 Micelles on the Rate of the Condensation between Ninhydrin and Mercury-Dipeptide Complex in Absence and Presence of Salts and Organic Solvents: A Kinetic Approach

  • Adel A. M. Saeed Dept. of Chemistry/Faculty of Science, University of Aden, Aden, Yemen
  • Taher A.A. Salem Dept. of Chemistry/Faculty of Saber Education, University of Aden, Aden, Yemen
  • Moh.d Akram Dept. of Chemistry/Faculty of Science,AMU, Aligarh-202002, U.P., India

Abstract

The interaction of mercury(II)–glycyl-L-alanine [Hg(II)–Gly-L-Ala]+ complex with ninhydrin has been studied kinetically both in aqueous as well as micellar media (cationic conventional/gemini surfactants) using UV-vis spectrophotometer at 70 ºC and a particular pH 5.0. The study was carried out as functions of [Hg(II)–Gly-L-Ala]+, [ninhydrin], [surfactant] [salts], and solvents (%v/v). The first-order-rate is observed concerning [Hg(II)–Gly-L-Ala]+, whereas fractional-order-rate dependence for [ninhydrin]. It has been found that 14-s-14 geminis enhance the rate of reaction more effectively than related cationic conventional surfactant tetradecyltrimethylammonium bromide (TTAB). The effect of additives such as salts (inorganic/organic) and organic solvents on the rate was also investigated. The reaction rate was explained in terms of the modified pseudo phase model (considering the association/adsorption of both the reactants on the micellar surface) and changes in micellar morphology occurring at higher [geminis]. The Eyring equation is valid for the reaction over the range of temperatures used. Various thermodynamic parameters and binding constants between reactants with the micelles have been evaluated.

Keywords: Catalytic effect, [Hg(II)–Gly-L-Ala] , Ninhydrin, Gemini surfactants, Salts, Organic solvents.

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Published
2020-03-07
How to Cite
Saeed , A. A. M., Salem , T. A. A., & Akram , M. (2020). Influence of TTAB/14-S-14 Micelles on the Rate of the Condensation between Ninhydrin and Mercury-Dipeptide Complex in Absence and Presence of Salts and Organic Solvents: A Kinetic Approach. Electronic Journal of University of Aden for Basic and Applied Sciences, 1(1), 1-13. https://doi.org/10.47372/ejua-ba.2020.1.3