Hydrogen Bonding in Methyl-Substituted Pyridine - Water Complexes

A Theoretical Study

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Density functional theory (DFT) and second-order Møller - Plesset perturbation theory (MP2) are applied to determine the hydrogen bonding interaction energies in pyridine - water and in a set of methyl-substituted pyridine - water complexes. The results show that methyl substitution stabilizes the hydrogen bond and the degree of stabilization varies with the number and the position of methyl groups. It is demonstrated that the MP2 method yields more reliable relative stabilities for these complexes than does the applied DFT method, which does not take proper account of the dispersion interactions between water and the methyl groups in ortho positions. The comparison of the order of the computed association energies of methyl-substituted pyridine - water complexes with the experimentally observed sequence of the ease of miscibility of these molecules with water shows that there is no simple relationship between the miscibility behavior and the strength of hydrogen bond formed between water and methyl derivatives of pyridine.

Original languageEnglish
Pages (from-to)2132-2137
Number of pages6
JournalJournal of Physical Chemistry A
Volume104
Issue number10
Publication statusPublished - Mar 16 2000

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pyridines
Hydrogen bonds
Water
hydrogen
water
Density functional theory
solubility
Solubility
hydrogen bonds
density functional theory
pyridine
Substitution reactions
Stabilization
perturbation theory
stabilization
Association reactions
interactions
substitutes
Derivatives
Molecules

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Hydrogen Bonding in Methyl-Substituted Pyridine - Water Complexes : A Theoretical Study. / Pápai, I.; Jancsó, G.

In: Journal of Physical Chemistry A, Vol. 104, No. 10, 16.03.2000, p. 2132-2137.

Research output: Contribution to journalArticle

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