The first ionization constants of the 2-, 3-, and 4-aminopyridines were evaluated by spectrophotometric methods using Evolving Factor Analysis approach. The ionization constants of aniline and pyridine were estimated by potentiometric methods in the same experimental conditions for comparison. A C-13 NMR spectroscopy study is here presented to assess the protonation site in aminopyridines and to evaluate the resonance effects.
A spectroscopic study on ionization of 2-, 3- and 4-aminopyridines
CRISPONI, GUIDO;ARAGONI, MARIA CARLA;CASU, MARIANO;CESARE MARINCOLA, FLAMINIA;NURCHI, VALERIA MARINA
1999-01-01
Abstract
The first ionization constants of the 2-, 3-, and 4-aminopyridines were evaluated by spectrophotometric methods using Evolving Factor Analysis approach. The ionization constants of aniline and pyridine were estimated by potentiometric methods in the same experimental conditions for comparison. A C-13 NMR spectroscopy study is here presented to assess the protonation site in aminopyridines and to evaluate the resonance effects.
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