## Abstract Atomic charges derived from a recently described approach to the very rapid computation of AM1 electrostatic potentials (ESP) accurately parallel, but are ca. 20% smaller than, the corresponding HF/6‐31G\* values. The dipole moments computed from the AM1 charges are virtually identical
Semiempirical AM1 electrostatic potentials and AM1 electrostatic potential derived charges: A comparison with ab initio values
✍ Scribed by Gyorgy G. Ferenczy; Christopher A. Reynolds; W. Graham Richards
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 725 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
Electrostatic potentials calculated from AM1 wave functions have been compared with ab initio STO-3G values and qualitative agreement has been found. Atomic charges derived from AM1 electrostatic potentials for both experimental and AM1 optimized geometries are of comparable quality with STO-3G potential derived charges. These results suggest that the AM1 electrostatic potential may be useful both in its own right and also for deriving atomic charges for use in molecular dynamics studies.
📜 SIMILAR VOLUMES
A new approach to the computation of molecular electrostatic potentials based on the AM1 wave function is described. In contrast to the prevailing philosophy, but consistent with the underlying NDDO approximation, no deorthogonalization of the wave function is carried out. The integrals required for
Corrected Mulliken charges obtained from the charge-charge flux-overlap model of infrared intensities and atomic charges derived from molecular electrostatic potentials are found to be of comparable quality at the AM I and the MNDO levels of the molecular orbital approximation. At the MNDO level bot
Various empirical potentials (AMBER 3.0, AMBER 4.1, CHARMM 23, CVFF, OPLS, Poltev) and semi-empirical quantum chemical methods (AM1, PM3, MNDO/M) were tested to reproduce the ab initio MP2 stabilization energies of DNA H-bonded base pairs (26 different base pairs). The best performance of an empiric
## PERFORMANCE METHODS FOR INTERACTION OF DNA BASES exhibited by AMBER 4.1 with the force field of Cornell et al. The SCFD method, tested for H-bonded pairs only, exhibited stabilization energies that were too large. Semiempirical quantum chemical methods gave poor agreement with MP2 values in the