Molecular complexation of 18-crown-6 with L-carnosine, β-alanine and histidine in water and in aqueous-ethanol solvent

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发表日期：

2024年4月12日

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T. R. Usacheva,
O. N. Krutova,
D. V. Batov,
E. V. Saturina,
E. E. Kiptikova,
Y. A. Anufrikov,
A. Y. Shasherina,
C. Giancola

摘要

The intermolecular interactions of 18-crown-6 with L-carnosine, β-alanine and histidine in water and in an aqueous-ethanol solvent with a composition of 0.1 mol fr ethanol at T = 298.15 K were studied using the method of isothermal titration calorimetry. The enthalpy of dissolution of crystalline β-alanine was determined using the method of dissolution calorimetry in an aqueous solution of ethanol with an ethanol content of 0.1 mol fr at T = 298.15 K. The thermodynamic parameters of the reactions of the formation of molecular complexes between 18-crown-6 and amino acids were analyzed. The enthalpy of combustion of 18-crown-6 was determined using bomb calorimetry, and the enthalpy of formation of crystalline 18-crown-6 was calculated.