The Influence of Solvent in Binary Acetonitrile -Water Solvent Systems on Dissociation Constants of Protonated Pyridine and Its N-Oxide

• Autorzy: Wróbel, R. , Makowski, M. , Czaja, M. , Chmurzyński, L.
• Języki publikacji: EN

Abstrakty

EN

Using a 2,6-dinitrophenol - tetra-n-butylammonium 2,6-dinitrophenolate standardizing system, the application of the previously proposed method for pKa determination of potentiometric standards in binary solvent systems consisting of an organic polar solvent (acetonitrile in this case) and water was checked. The reliability of the obtained pKa values of 2,6-dinitrophenol was checked in a system of protonated pyridine in acetonitrile - water mixtures over the range of 0 through 1 mole fraction of acetonitrile, for which literature data were available. The method checked in this way was subsequently used to determine pKa of protonated pyridine N-oxide in this binary solvent system. pKa values served for discussion of the variations of pKa's of cationic acids conjugated with pyridine and its N-oxide and of the influence of composition of the binary solvent.

• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2001
• Tom: Vol. 75, nr 11
• Strony: 1767-1774
• Opis fizyczny: Bibliogr. 24 poz., rys.

Twórcy

autor

Wróbel, R.

autor

Makowski, M.

autor

Czaja, M.

autor

Chmurzyński, L.

• Department of General Chemistry, Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952, Gdansk, Poland