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Molecules 1997, 2(11), 169-175; doi:10.3390/21100169

Experimental Studies on the UV-Spectra of Several Substituted Pyridine N-Oxides and Conjugated Cationic Acids in Acetonitrile

Department of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdansk, Poland
Received: 2 June 1997 / Accepted: 24 August 1997 / Published: 15 November 1997
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Abstract

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.
Keywords: UV spectra; pyridine N-oxides; cationic acids; perchloric acid; acetonitrile UV spectra; pyridine N-oxides; cationic acids; perchloric acid; acetonitrile
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Chmurzynski, L. Experimental Studies on the UV-Spectra of Several Substituted Pyridine N-Oxides and Conjugated Cationic Acids in Acetonitrile. Molecules 1997, 2, 169-175.

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