On the role of the basis set and electron correlation in the description of stacking interactions

ArticleinComputers & Chemistry 21(5):347-354 · January 1997
DOI: 10.1016/S0097-8485(96)00035-6 · Source: DBLP

    Abstract

    Ab initio SCF and Möller-Plesset electron correlations, up to fourth-order calculations, have been performed for a very simple model system of stacking interactions—the water dimer with parallel and antiparallel dipole-dipole orientations. The performance of a variety of basis sets in evaluating the basis set superposition error and the interaction energy has been systematically examined. It is shown that for a proper description of the stacking interaction the diffuse sp-functions as well as the multiple sets of polarization functions are required. Additional calculations were carried out with popular semi-empirical methods (MNDO, AMI and PM3). All of the applied semi-empirical methods greatly overestimate the interaction forces and give qualitatively incorrect results.