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<p>The present work deals with kinetic study of dihydroxy-1,3-indanedione (Nin) and aspartic acid (AA) in gemini (14-<i>s</i>-14) surfactants at 343&#xa0;K applying the UV spectrophotometric approach. The values of the rate constant (<i>k</i><sub>ψ</sub>) were determined in geminis by varying different experimental reaction ingredients, i.e., [Nin], [AA], pH and temperatures. The study follows a fractional- and first-order kinetics of paths in [Nin] and [AA], respectively. The effect of several concentrations of gemini surfactants ranging from 1 to 3000 × 10<sup>–5</sup>&#xa0;mol&#xa0;dm<sup>−3</sup> was carried out and <i>k</i><sub>ψ</sub> achieved at varied concentrations, thus, were recorded. Quantitative analyses of results calculated at [surfactants] are shown as <i>k</i><sub>ψ</sub> vs. [14-<i>s</i>-14] plot and are treated using a kinetic model called pseudo-phase model of micellar catalysis. To evaluate the critical micellar concentration (cmc) of pure gemini and gemini + reactants, a conductometric approach was applied under the current kinetic reaction conditions. Binding parameters (<i>K</i><sub>X</sub> for AA and <i>K</i><sub>Y</sub> for Nin), micellar-rate constant (<i>k</i><sub>m</sub>) and thermodynamic parameters (Δ<i>H</i><sup>#</sup>, Δ<i>S</i><sup>#</sup> and <i>E</i><sub>a</sub>) are also determined and discussed, appropriately.</p>

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Kinetic study of dihydroxy-1,3-indanedione and aspartic acid in gemini (14-s-14) surfactants: a multi-technique approach

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Dileep Kumar,
  • Malik Abdul Rub,
  • Abhishek Srivastava,
  • Nazima Sultana,
  • Mihalj Posa,
  • Poonam Sharma,
  • Bidyut Saha,
  • Khalid A. Alzahrani,
  • Ajaya Bhattarai

摘要

The present work deals with kinetic study of dihydroxy-1,3-indanedione (Nin) and aspartic acid (AA) in gemini (14-s-14) surfactants at 343 K applying the UV spectrophotometric approach. The values of the rate constant (kψ) were determined in geminis by varying different experimental reaction ingredients, i.e., [Nin], [AA], pH and temperatures. The study follows a fractional- and first-order kinetics of paths in [Nin] and [AA], respectively. The effect of several concentrations of gemini surfactants ranging from 1 to 3000 × 10–5 mol dm−3 was carried out and kψ achieved at varied concentrations, thus, were recorded. Quantitative analyses of results calculated at [surfactants] are shown as kψ vs. [14-s-14] plot and are treated using a kinetic model called pseudo-phase model of micellar catalysis. To evaluate the critical micellar concentration (cmc) of pure gemini and gemini + reactants, a conductometric approach was applied under the current kinetic reaction conditions. Binding parameters (KX for AA and KY for Nin), micellar-rate constant (km) and thermodynamic parameters (ΔH#, ΔS# and Ea) are also determined and discussed, appropriately.