Ab initio counterpart of infrared atomic charges. Comparison with charges obtained from electrostatic potentials
β Scribed by M.N. Ramos; M. Gussoni; C. Castiglioni; G. Zerbi
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 459 KB
- Volume
- 151
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Atomic charges obtained from infrared intensities have already been shown to be adequately represented by Mulliken net charges and even better by a version of Mulliken charges which makes them fit the molecular dipole moment. It is shown in this paper that the atomic charges derived from electrostatic potentials give the same picture of the charge distribution within molecules as that obtained from the corrected Mulliken charges.
π SIMILAR VOLUMES
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 pote
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
Four methods for deriving partial atomic charges from the Ε½ quantum chemical electrostatic potential CHELP, CHELPG, Merz-Kollman, and . RESP have been compared and critically evaluated. It is shown the charges strongly depend on how and where the potential points are selected. Two alternative method