Naslov
Tautomeric and Protonation Equilibria of Schiff Bases of Salicylaldehyde with Aminopyridines

Autori
Galić, Nives ; Cimerman, Zvjezdana ; Tomišić, Vladislav

Izvornik
Analytica chimica acta (0003-2670) 343 (1997); 135-143

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Schiff bases ; protonation constants ; tautomeric constants ; spectrophotometric method

Sažetak
The equilibria of the Schiff bases of salicylaldehyde with 2-aminopyridine, 2, 3-diaminopyridine, 2, 6-diaminopyridine and 3-aminomethylpyridine were studied by means of spectroscopic methods. In non-polar solvents enolimines were predominantly present. In polar solvents rapid tautomeric interconversion of enolimines to ketoamines as well as slow hydrolysis were noted. The tendency to tautomeric interconversion was significant in the case of 2-(3-pyridylmethyliminomethyl)phenol, whereas in the case of other Schiff bases it was very low. The corresponding tautomeric constants were estimated in a variety of solvents on the bases of UV spectral data. The protonation constants of all compounds were determined in methanol/water mixtures by the spectrophotometric method and discussed with to their structural characteristics and solvent properties.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA