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Uncoupled Hartree-Fock calculations of the ring current contribution to the chemical shifts in conjugated hydrocarbons

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Abstract

Uncoupled Hartree-Fock perturbation theory is adapted for the calculation of the ring current contribution to the chemical shifts in a number of conjugated hydrocarbons. The results compare favourably with those of the coupled form of the theory. It is also shown that the Hückel approach may be modified so as to give values close to those of the SCF theory.

Zusammenfassung

Für einige konjugierte Kohlenwasserstoffe wird zur Berechnung des Anteils des Ringstroms an der chemischen Verschiebung die ungekoppelte Hartree-Fock-Störungstheorie verwandt. Die Ergebnisse stimmen gut mit denen überein, die man mit der gekoppelten Form der Theorie erhält. Ferner wird gezeigt, daß der Ansatz nach Hückel derart modifiziert werden kann, daß die Ergebnisse den aus der SCF-Theorie erhaltenen nahekommen.

Résumé

La théorie de perturbation Hartree-Fock non couplé est adaptée pour le calcul de la contribution du «courant cyclique» aux déplacements chimiques dans un certain nombre d'hydrocarbures conjugués. Les résultats se comparent favorablement à ceux de la théorie de Hartree-Fock couplé. On montre que par ailleurs l'approximation de type Hückel peut être modifiée de manière à donner des valeurs proches de celles de la théorie SCF.

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Roberts, H.G.F. Uncoupled Hartree-Fock calculations of the ring current contribution to the chemical shifts in conjugated hydrocarbons. Theoret. Chim. Acta 15, 63–72 (1969). https://doi.org/10.1007/BF00526466

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  • DOI: https://doi.org/10.1007/BF00526466

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