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Molecular complexation of some amino acids and triglycine with 18-crown-6 ether in H2O-EtOH solvents at 298.15 K

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Abstract

The influence of composition of H2O-EtOH solvent on the reaction of formation of a molecular complex of 18-crown-6 ether (18C6) with triglycine (3Gly) has been studied at 298.15 K by a thermochemical method. The standard thermodynamic parameters (Δr G°, Δr H°, and TΔr S°) of the reaction of [3Gly18C6] complex formation in water-ethanol (H2O-EtOH) solvents having an EtOH mole fraction of 0.0, 0.1, 0.15, 0.2, 0.25, 0.30, and 0.50 have been calculated from the data of calorimetric measurements performed on a TAM III titration microcalorimeter. It has been found that an increase in EtOH concentration in the mixed solvent results in an increase in stability of [3Gly18C6] and in an enhancement in exothermicity of its formation reaction. The water-ethanol solvent has an analogous effect on the stability and energetics of the reactions of formation of molecular complexes of 18C6 with glycine, D,L-alanine, and L-phenylalanine.

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Authors and Affiliations

  1. Research Institute of Thermodynamics and Kinetics of Chemical Processes, Ivanovo State University of Chemistry and Technology, Ivanovo, 153460, Russia

    T. R. Usacheva, Fam Tkhi Lan & V. A. Sharnin

  2. Cracow University of Technology, Cracow, Poland

    A. Baranski

Authors
  1. T. R. Usacheva
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  2. Fam Tkhi Lan
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  3. V. A. Sharnin
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  4. A. Baranski
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Original Russian Text © T.R. Usacheva, Fam Tkhi Lan, V.A. Sharnin, A. Baranski, 2013, published in Zhurnal Neorganicheskoi Khimii, 2013, Vol. 58, No. 10, pp. 1409–1413.

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Usacheva, T.R., Lan, F.T., Sharnin, V.A. et al. Molecular complexation of some amino acids and triglycine with 18-crown-6 ether in H2O-EtOH solvents at 298.15 K. Russ. J. Inorg. Chem. 58, 1264–1268 (2013). https://doi.org/10.1134/S0036023613100239

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  • DOI: https://doi.org/10.1134/S0036023613100239

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