Calculation of p-Band Positions of Aromatic Polycyclic Hydrocarbons by Limited Configuration Interaction Method
- 15 June 1962
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 36 (12), 3129-3134
- https://doi.org/10.1063/1.1732440
Abstract
The positions of p‐bands of 20 aromatic polycyclic hydrocarbons have been calculated by the semiempirical limited configuration interaction method in a π‐electron approximation using Hückel's molecular orbitals. The agreement with experimental values is very good. The effect of the extent of configuration interaction has been studied. It has been demonstrated that the contribution of electron repulsion integrals is nearly constant within this class of hydrocarbons. The failure of the approximation of Hückel in the studies of spectra of compounds with conjugated double bonds belonging to different classes of hydrocarbons, has been explained by the fact that the contribution of electron repulsion integrals is larger with polyenes and considerably smaller with tropylium and its benzoderivatives. The usefulness of the approximation of Hückel within one class of compounds is demonstrated by a comparison of the experimental and theoretical (according to Hückel) positions of the lowest energy absorption maximum of the aromatic hydrocarbon derivatives.Keywords
This publication has 18 references indexed in Scilit:
- Electronic Spectra of Substituted Aromatic Hydrocarbons. I. Phenol and AnilineBulletin of the Chemical Society of Japan, 1961
- Notiz über die Berechnung des längstwelligen π‐π*‐Überganges nach dem Verfahren von E. HÜCKELHelvetica Chimica Acta, 1961
- Untersuchungen in der Benztropylium‐Reihe XII. Absorptionsspektrum und Acidität benzologer Tropylium‐KationenHelvetica Chimica Acta, 1960
- Electronic Spectra of Acridine and PhenazineBulletin of the Chemical Society of Japan, 1958
- Electronic Structure and Spectra of Nitrogen HeterocyclesZeitschrift für Physikalische Chemie, 1957
- The Electronic Spectra of Aromatic Molecules II: A Theoretical Treatment of Excited States of Alternant Hydrocarbon Molecules based on Self-Consistent Molecular OrbitalsProceedings of the Physical Society. Section A, 1955
- Molecular Calculations. III. A Modification of the Naive Semiempirical MO MethodThe Journal of Chemical Physics, 1955
- The Electronic Spectra of Cata-Condensed HydrocarbonsThe Journal of Chemical Physics, 1954
- Electron interaction in unsaturated hydrocarbonsTransactions of the Faraday Society, 1953
- The electronic structure of some polyenes and aromatic molecules IV-The nature of the links of certain free radicals.Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1938