New density functional and atoms in molecules method of computing relative pKa values in solution

Adam, Kenneth R. (2002) New density functional and atoms in molecules method of computing relative pKa values in solution. Journal of Physical Chemistry: Part A, 106 (49). pp. 11963-11972.

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Abstract

A theoretical structure−property relation between pKa and Bader's atoms in molecules (AIM) energy of the dissociating proton was obtained by an approximation of the standard gas-phase expression for the equilibrium constant expressed in terms of molecular partition functions. This relation was then tested by solvated density functional computations on a series of aliphatic carboxylic acids, substituted benzoic acids, phenols, anilinium ions, and pyridinium ions using the COSMO solvation model. Comparison with accurate experimental values indicates that average unsigned errors of generally less than 0.2 pKa units can be achieved in the calculation of relative pKa values. The inclusion of specifically hydrogen-bonded water molecules in the vicinity of the dissociating proton was found to improve the agreement between theory and experiment greatly. Computed pKa values for some diprotic acids were also investigated.

Item ID: 13593
Item Type: Article (Research - C1)
ISSN: 1520-5215
Keywords: computational chemistry; physical chemistry
Date Deposited: 29 Nov 2010 01:50
FoR Codes: 03 CHEMICAL SCIENCES > 0307 Theoretical and Computational Chemistry > 030701 Quantum Chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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