Get access

A new approach to counterpoise correction to BSSE

Authors

  • Annia Galano,

    Corresponding author
    1. Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 007730 México D.F., México
    • Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, 007730 México D.F., México
    Search for more papers by this author
  • J. Raúl Alvarez–Idaboy

    1. Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México D.F., México
    Search for more papers by this author

Abstract

In the present work the intermolecular BSSE, associated to the A–B interaction, is obtained by subtracting the intramolecular BSSE of the fragments from the intramolecular BSSE of the supermolecule, and considering every atom as a fragment in the calculation of each intramolecular BSSE. This atom by atom scheme (CPaa) is based on the consideration that the proximity of the fragments may affect the intramolecular BSSE of every involved species, and artificially influences the value of the BSSE associated to the supermolecule formation. It drastically decreases the reported counterpoise overcorrection of the A–B interaction, even though it does not deal with all the overcorrection because it includes all the orbitals, and not only the unoccupied ones. This new approach has been tested on the water dimer, some hydrogen fluoride weakly bonded complexes, the conformational analysis of 1,2-dichloroethane, and the reaction profile of formaldehyde + OH reaction. © 2006 Wiley Periodicals, Inc. J Comput Chem 27: 1203–1210, 2006

Ancillary