Long range C, N and H atom-atom potential parameters fromab initiodispersion energies for different azabenzene dimers
- 1 November 1979
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 38 (5), 1497-1506
- https://doi.org/10.1080/00268977900102601
Abstract
After comparing theoretically the atom-atom model with the multipole expansion for the dispersion energy, we derive atom-atom potential parameters for C, N and H contacts by fitting the atom-atom dispersion energies to the dispersion interactions calculated by an ab initio method for the following (aza)-benzene molecules: benzene, pyridine, pyridazine, pyrimidine, pyrazine, s-triazine and s-tetrazine. The data base for the fit consists of 1200 randomly chosen configurations for each azabenzene dimer. The optimized parameters for the carbon and hydrogen contacts in particular are not unique ; reasonably good fits are obtained with different parameter sets. A very simple rule, which relates the atom-atom potentials to the isotropic molecular C6 dispersion coefficients, already leads to good estimates for the parameters. From the empirical parameter sets available in the literature the William-Govers set yields results which are close to our ab initio dispersion energies.Keywords
This publication has 23 references indexed in Scilit:
- Anisotropy of long range interactions between linear molecules: H2-H2 and H2-HeMolecular Physics, 1979
- The dimer interaction and lattice energy of ethylene and pyrazine in the multipole expansion; a comparison with atom-atom potentialsMolecular Physics, 1977
- A heuristic intermolecular potential function for formaldehyde-water based on ab initio molecular orbital calculationsJournal of the American Chemical Society, 1977
- Analytical potentials from "ab initio" computations for the interaction between biomolecules. 1. Water with amino acidsJournal of the American Chemical Society, 1977
- Analytical potentials from "ab initio" computations for the interaction between biomolecules. 2. Water with the four bases of DNAJournal of the American Chemical Society, 1977
- Analytical potentials from "ab initio" computations for the interaction between biomolecules. 3. Reliability and transferability of the pair potentialsJournal of the American Chemical Society, 1977
- Atomic polarizabilities for ground and excited states of C, N, and OPhysical Review A, 1977
- Quantum theoretical calculations of van der Waals interactions between molecules. Anisotropic long range interactionsInternational Journal of Quantum Chemistry, 1977
- Intermolecular potentials from crystal data. III. Determination of empirical potentials and application to the packing configurations and lattice energies in crystals of hydrocarbons, carboxylic acids, amines, and amidesThe Journal of Physical Chemistry, 1974
- Coulombic interactions in crystalline hydrocarbonsActa Crystallographica Section A, 1974