Universal Method for Electrostatic Interaction Energies Estimation with Charge Penetration and Easily Attainable Point Charges

Our new model of electron density augmented by point charges (aug-PROmol) provides an estimation of electrostatic interaction energies including penetration effects (ChemPhysChem 2016, 17, 2455−2460). In this paper we prove that it can be applied using sources of point charges other than those from direct restrained fitting to electrostatic potential (RESP). We used a newly established databank of tabulated invariom point charges and a widely known semiempirical method. Both sources perform equivalently to the basic aug-PROmol method as well as to reference energies at the DFT-SAPT/augcc-pVTZ level of theory. This is possible due to the universal character of the penetration model included in the aug-PROmol. Aug-PROmol may become a basis for development of new nonbonded terms in force fields or a high success rate scoring function.