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The mechanism of double proton transfer in dimers of uracil and 2-thiouracil—The reaction force perspective

✍ Scribed by Al Mokhtar Lamsabhi; Otilia Mó; Soledad Gutiérrez-Oliva; Patricia Pérez; Alejandro Toro-Labbé; Manuel Yáñez

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
454 KB
Volume
30
Category
Article
ISSN
0192-8651

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✦ Synopsis

Abstract

The intermolecular double proton transfer in dimers of uracil and 2‐thiouracil is studied through density functional theory calculations. The reaction force framework provides the basis for characterizing the mechanism that in all cases has been associated to a dynamic balance between polarization and charge transfer effects. It has been found that the barriers for proton transfer depend upon the nature of the acceptor atoms and its position within the seminal monomer. Actually, the change in the nature of the hydrogen bonds connecting the two monomers along the reaction coordinate may favor or disfavor the double‐proton transfer. © 2008 Wiley Periodicals, Inc. J Comput Chem, 2009

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