Ab Initio Calculation of Torsion and Inversion Barriers of the Amino Group in Aminopyrimidines

Calculations of the barriers to internal rotation and inversion of the amino group in substituted pyrimidines have been performed. Torsion and inversion barriers were determined by several ab initio methods:  HF, HF/MP2, MP4, CISD, QCISD, QCISD(T), CCSD, and CCSD(T). DFT method also employed. Depend...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2005-04, Vol.109 (14), p.3244-3249
Main Authors: Golovacheva, Anna Yu, Romanov, Alexey N., Sulimov, Vladimir B.
Format: Article
Language:English
Subjects:
Amines - chemistry
Models, Molecular
Pyrimidines - chemistry
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Summary:Calculations of the barriers to internal rotation and inversion of the amino group in substituted pyrimidines have been performed. Torsion and inversion barriers were determined by several ab initio methods:  HF, HF/MP2, MP4, CISD, QCISD, QCISD(T), CCSD, and CCSD(T). DFT method also employed. Dependencies of the calculated barrier heights on the basis set and the electron correlation level and on the substitution position of the nitrogen atom in the ring were studied. We have determined that for certain molecules relatively low level calculations may eventually provide adequate results, but in general, higher level calculations are necessary.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp044543x