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<p>UV–Vis and FT-IR spectroscopic methods, along with dynamic light scattering (DLS) measurements, were used to investigate the binding of <i>p</i>-nitroaniline (<i>p</i>-NA) in diethyl sulfoxide (DESO) and dimethyl sulfoxide (DMSO)-containing AOT reverse micelles in <i>n</i>-heptane at varying molar ratios of polar solvent to AOT. Both DESO (or DMSO) and DESO (or DMSO) + water mixtures were used as polar solvents. The binding constant (<i>K</i><sub>b</sub>) between <i>p</i>-NA and AOT was calculated for the aforementioned reverse micelles. Variations in the <i>K</i><sub>b</sub> values were interpreted in terms of competitive molecular interactions, taking into account the hydrogen-bond donor ability of <i>p</i>-NA, solvation of counter ion Na<sup>+</sup> by DESO (or DMSO), the self-associative structure of sulfoxides, and their hydrogen-bonding interactions with water. FT-IR spectra indicate that DMSO or DESO encapsulated within the reverse micelles does not interact with either the C=O or the SO<sub>3</sub><sup>−</sup> groups of AOT. Notably, significant solvation of the Na<sup>+</sup> counterion by DMSO results in its displacement from the AOT surface, contributing to an increase in <i>K</i><sub>b</sub> value. DLS measurements confirm that molecular interactions have a significant impact on the size of the reverse micelles.</p>

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Study of p-Nitroaniline Binding to Diethyl Sulfoxide-Containing AOT Reverse Micelles: Comparison to Dimethyl Sulfoxide

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Hasmik R. Sargsyan,
  • Heghine H. Ghazoyan,
  • Shiraz A. Markarian,
  • Gevorg S. Grigoryan

摘要

UV–Vis and FT-IR spectroscopic methods, along with dynamic light scattering (DLS) measurements, were used to investigate the binding of p-nitroaniline (p-NA) in diethyl sulfoxide (DESO) and dimethyl sulfoxide (DMSO)-containing AOT reverse micelles in n-heptane at varying molar ratios of polar solvent to AOT. Both DESO (or DMSO) and DESO (or DMSO) + water mixtures were used as polar solvents. The binding constant (Kb) between p-NA and AOT was calculated for the aforementioned reverse micelles. Variations in the Kb values were interpreted in terms of competitive molecular interactions, taking into account the hydrogen-bond donor ability of p-NA, solvation of counter ion Na+ by DESO (or DMSO), the self-associative structure of sulfoxides, and their hydrogen-bonding interactions with water. FT-IR spectra indicate that DMSO or DESO encapsulated within the reverse micelles does not interact with either the C=O or the SO3− groups of AOT. Notably, significant solvation of the Na+ counterion by DMSO results in its displacement from the AOT surface, contributing to an increase in Kb value. DLS measurements confirm that molecular interactions have a significant impact on the size of the reverse micelles.