Proton-transfer reactions of dibasic acids in aqueous solution: 3-hydroxypyridine and anthranilic acid
Year: 1989
Type: article
Abstract: Reaction enthalpies and reaction volumes of proton-transfer reactions in aqueous solutions of 3-hydroxypyridine have been estimated by measuring UV-visible absorption spectra at different temperatures, pressures, and pH values.Using these results together with published thermodynamic and kinetic data, we have simulated the relaxation spectrum of the proton-transfer reactions of 3-hydroxypyridine in aqueous solution.The first process identified in our normal mode analysis is the relaxation of the well-known tautomeric equilibrium between the neutral form and the zwitterion, AN = A,.The second relaxation process is the overall reaction A+ + A-= XAN + (2 -x)Az, with x being roughly equal to unity.The amplitude of this relaxation is significantly smaller than that of the first.The third relaxation process consists of two branches.The first branch is the overall reaction A+ = XAN + (1 -x)A2 + H+, x -0.5, at pH << 7, and the second branch is the overall reaction XAN + (1x)AZ + OH-= A-+ H20, x -0.5, at pH >> 7. The fourth relaxation process is more complicated than the ( 5 ) Dubois, J. E.; Dreyfus, M. E. In Protons and Ions Involved in Fast
DOI: 10.1021/j100338a085
Authors: Johannes Reiter, Anton Beyer, Martin Potschka, Peter Schuster, Heinz Winkler, Hans Ebeling, E. U. Franck
Language: English
Topic: Chemical Reaction Mechanisms
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1964321698