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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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Volume 20, Issue 6


Electron paramagnetic resonance and phosphorescence measurements of the triplet state of orotic acid and related pyrimidines

A. Haug / P. Douzou
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znb-1965-0602

With orotic acid an EPR triplet state signal (ΔM= ±2) was observed in a non-cracking rigid solvent at 77°K. This triplet state, lying at 470 mμ, has a mean half-life of 0.2 sec and is characterized by a large zero-field splitting.

Excitation and phosphorescence spectra of related pyrimidines were measured, too. Besides uracil and cytosine, the excitation peak of these pyrimidines coincides with the large π—π* absorption peak. In the case of uracil and cytosine the excitation peak lies distinctly separated at the long wavelength side of the corresponding absorption peak. This probably indicates a n—π* excitation. The failure to record EPR triplet signals in these pyrimidines is attributed to large zero-field splitting.

About the article

Received: 1965-01-25

Published Online: 2014-06-02

Published in Print: 1965-06-01

Citation Information: Zeitschrift für Naturforschung B, Volume 20, Issue 6, Pages 509–512, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-1965-0602.

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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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