Thermodynamics of the solution equilibria of 3-hydroxypyridine and pyridoxine in water-dioxane mixtures

Autor:	Salvador B. Asensio, Juan Llor
Rok vydání:	1995
Předmět:	Aqueous solution Chemistry Biophysics Thermodynamics Biochemistry Tautomer Gibbs free energy Solvent symbols.namesake Ionization symbols Physical chemistry Binary system Physical and Theoretical Chemistry Solvent effects Molecular Biology Equilibrium constant
Zdroj:	Journal of Solution Chemistry. 24:1293-1305
ISSN:	1572-8927 0095-9782
Popis:	The thermodynamics of tautomeric and microscopic ionization equilibrium constants of 3-hydroxypyridine and pyridoxine have been determined in waterdioxane mixtures (0–70% weight fraction in dioxane) ranging from 10°C to 50°C. Generally, for both types of processes, the entropic contributions to the Gibbs energy predominate and this tendency increase concomitantly with the dioxane content in the media. The thermodynamic parameters are consistent with the corresponding values obtained from macroscopic ionization processes. An equation for the equilibrium constant K as a function of temperature and a solvent characteristic parameter is proposed to predict the K values throughout the whole range of the temperature and solvent compositions studied.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a86627e933c9c29872790f5f5b36d184 https://doi.org/10.1007/bf00972834 Zobrazit plný text záznamu Full text from SpringerLink