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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

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1865-7109
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Volume 37, Issue 11

Issues

Semiempirical MNDO and UV Absorption Studies on Tautomerism of 2-Quinolones

Julian Mirek / Andrzej Syguła
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1982-1111

Semiempirical MNDO calculations with geometry optimization were carried out for seven 4-X-2-quinolone tautomers (X = H, CH3, Cl, OCH3, N(CH3)2, COOH, COOCH3). The results show that 2-hydroxyquinolines are less stabilized compared to 2-quinoIones than 2-hydroxypyridines vs. 2-pyridones. The earlier estimated correction applied to these MNDO results suggests that 4-X-2-quinolones have lower chemical binding energies than the corresponding 4-X-2- hydroxyquinolines by ca. 2.1-3.3 kcal/mol. It is additionally shown that the substituent in position 4 does not influence significantly the relative stabilities of the tautomers. The results of the calculations are verified by UV absorption studies of diluted decane solutions of 2-quinolones at ca. 120°.

CNDO/S-Cl-1 calculations based on the optimal MNDO geometries were carried out for 4-X-2- quinolone tautomers. The results generally agree well with the experimental data. A disagreement of the data for 4-COOR-2-quinolones is rationalized.

About the article

Received: 1982-06-03

Published Online: 2014-06-02

Published in Print: 1982-11-01


Citation Information: Zeitschrift für Naturforschung A, Volume 37, Issue 11, Pages 1276–1283, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1982-1111.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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