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Thermodynamics of DL-alanine solvation in water-dimethylsulfoxide mixtures at 298.15 K

  • Physical Chemistry of Solutions
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Abstract

In this study we mainly discuss the transfer Gibbs free energy ΔG 0 t (i) and ΔS 0 t (i)entropy of DL-alanine at 298.15 K and consequently the involved chemical transfer free energy (ΔG 0 t,ch (i)) and entropy (TΔS 0 t,ch (i)) in aqueous mixtures of dimethylsulfoxide are discussed to clarify the solvation chemistry of DL-alanine. For the evaluation of these energy terms, solubility of this amino acid has been measured by formol titrimetry at five equidistant temperatures i.e., from 288.15 to 308.15 K in different composition of this mixed solvent system. The various solvent parameters as well as thermodynamic parameters like molar volume, density, dipole moment and solvent diameter of this solvent system have also been reported here. The chemical effects of the transfer Gibbs energies (ΔG 0 t,ch (i)) and entropies of transfer (TΔS 0 t,ch (i)) have been obtained after elimination of cavity effect and dipole-dipole interaction effects from the total transfer energies. Here the chemical contribution of transfer energetics of DL-alanine is mainly guided by the composite effects of increased dispersion interaction, basicity effect and decreased acidity, hydrogen bonding effects, hydrophilic hydration and hydrophobic hydration of aqueous DMSO mixtures as compared to that of reference solvent, water.

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Authors and Affiliations

  1. Department of Chemistry, Shibpur Dinobundhoo Institution (college), Howrah, W.B., India

    S. Roy

  2. Department of Chemistry, University of Kalyani, Nadia, W.B., India

    K. Mahali

  3. Department of Chemistry, Visva-Bharati, Santiniketan, Birbhum, W.B., India

    S. Mondal & B. K. Dolui

Authors
  1. S. Roy
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  2. K. Mahali
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  3. S. Mondal
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  4. B. K. Dolui
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Correspondence to B. K. Dolui.

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Roy, S., Mahali, K., Mondal, S. et al. Thermodynamics of DL-alanine solvation in water-dimethylsulfoxide mixtures at 298.15 K. Russ. J. Phys. Chem. 89, 654–662 (2015). https://doi.org/10.1134/S0036024415040226

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  • DOI: https://doi.org/10.1134/S0036024415040226

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