Quantum-chemical modeling of the stacking mechanism for the 1H-4H proton transfer in pyridine derivatives. A DFT study

Document Type : Research Paper

Authors

1 Department of Chemistry, Tbilisi State University, Tbilisi 0179, Georgia

2 Department of Chemistry, Sukhumi State University, Tbilisi 0186, Georgia

Abstract

The stacking mechanism of the 1H-4H proton transfer in 4-pyridone, 4-pyridinthione and p-aminopyridine
are constructed. For quantitative description of this process by means of the quamtumchemical
method density functional theory (DFT) the activation energy (<E#), reaction energy (<E)
and tautomeric equilibrium constant (KT) has been calculated. The results of calculations have shown,
that the values of the energetical and kinetical characteristics, from the point of view of chemical
reactions, in reasonable limits varies, that allows one to make the conclusion in favour of competence
of the offered stacking mechanism for the 1H-4H proton transfer in pyridine derivatives. It is a new
one-stage synchronous and unique mechanism for the 1H-4H proton transfer.

Keywords