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Official Journal of the International Society of Pteridinology

Editor-in-Chief: Fuchs, Dietmar

IMPACT FACTOR 2018: 0.531

CiteScore 2018: 0.67

SCImago Journal Rank (SJR) 2018: 0.195
Source Normalized Impact per Paper (SNIP) 2018: 0.318

ICV 2017: 151.21

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Volume 19, Issue 1


Theoretical Study on the Relative Energies of Neutral Pterin Tautomers

Michael Soniat / Christopher B. Martin
Published Online: 2013-08-10 | DOI: https://doi.org/10.1515/pteridines.2008.19.1.120


Current literature lists the lactam and lactim tautomers as the only major contributors to aqueous pterin structures. Density functional theory calculations were used to determine whether there are other significant neutral tautomers of pterin participating in photochemical and biological systems other than the lactam and lactim forms in aqueous media. Calculations showed that the lactam tautomer is the lowest energy structure while the lactim structure is higher in energy than expected (∼6 kcal/mol) compared to the lactam structure. Three other neutral pterin structures were calculated to be less than ∼4 kcal/mol above the most stable lactam and therefore should also be considered as structures which possibly play an important role in chemical and biological pterin systems.

Keywords : lactam tautomer; lactim tautomer; pterin

About the article

Published Online: 2013-08-10

Published in Print: 2008-02-01

Citation Information: Pteridines, Volume 19, Issue 1, Pages 120–124, ISSN (Online) 2195-4720, ISSN (Print) 0933-4807, DOI: https://doi.org/10.1515/pteridines.2008.19.1.120.

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