%0 Journal Article
%T Experimental Studies on the UV-Spectra of Several Substituted Pyridine N-Oxides and Conjugated Cationic Acids in Acetonitrile
%A Lech Chmurzynski
%J Molecules
%D 1997
%I MDPI AG
%R 10.3390/21100169
%X The ultraviolet spectra of heterocyclic N-oxides of pyridine N-oxide series and the conjugated cationic acids (simple cations of protonated N-oxides) in acetonitrile as the representative of polar aprotic solvents, were determined. The obtained spectra of N-oxides studied (mainly tri-substituted pyridine N-oxides) and their cations obtained by the protonation of free N-oxides by the excess of perchloric acid, have been collected and discussed. Taking into account the spectroscopic results, a scheme of acid-base equilibria in polar aprotic solvents has been discussed. The influence of the traces of water on acid-base equilibria in nonaqueous media has been stressed.
%K UV spectra
%K pyridine N-oxides
%K cationic acids
%K perchloric acid
%K acetonitrile
%U http://www.mdpi.com/1420-3049/2/11/169