Point charge representation of multicenter multipole moments in calculation of electrostatic properties
- 1 March 1993
- journal article
- research article
- Published by Springer Nature in Theoretical Chemistry Accounts
- Vol. 85 (1-3) , 209-216
- https://doi.org/10.1007/bf01374589
Abstract
Summary Distributed Point Charge Models (PCM) for CO, (H2O)2, and HS-SH molecules have been computed from analytical expressions using multicenter multipole moments. The point charges (set of charges including both atomic and non-atomic positions) exactly reproduce both molecular and segmental multipole moments, thus constituting an accurate representation of the local anisotropy of electrostatic properties. In contrast to other known point charge models, PCM can be used to calculate not only intermolecular, but also intramolecular interactions. Comparison of these results with more accurate calculations demonstrated that PCM can correctly represent both weak and strong (intramolecular) interactions, thus indicating the merit of extending PCM to obtain improved potentials for molecular mechanics and molecular dynamics computational methods.Keywords
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