A determination of the electronegativity parameter in molecular orbital calculations on heteronuclear molecules containing nitrogen
- 1 October 1959
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 2 (4) , 367-371
- https://doi.org/10.1080/00268975900100351
Abstract
Using the semi-empirical LCAO molecular orbital method, the electronegativity parameter δ for nitrogen has been chosen to give reasonable fit between computed and ‘correct’ bond orders for a series of heterocyclic molecules. A δ-value of about 0·9–1·0 has been found for nitrogen in six-membered rings, and about 1·8–2·0 for pyrrole. En employant la méthode des orbitales moléculaires LCAO semi-empirique, on a choisi le paramètre d'electronegativité δ de l'azote afin d'obtenir un accord raisonnable entre les indices de liaison calculés et les indices ‘corrects’ pour une série de molécules hétérocycliques. On trouve une valeur δ d'environ 0,9–1,0 pour l'azote dans les cycles à six atomes, et d'environ 1,8–2,0 pour le pyrrole. Mit Hilfe der halbempirischen LCAO Methode zur Berechnung von Molecular Orbitals wird der Elektronegativitätsparameter δ für Stickstoff so angepasst, dass die abgeschätzten Bindungsordnungen für eine Reihe heterozyklischer Molekeln gut mit den ‘richtigen’ Bindungsordnungen übereinstimmen. Für Stickstoff in sechsgliedrigen Ringen wird ein δ-Wert von etwa 0,9–1,0 gefunden, für Pyrrol 1,8–2,0.Keywords
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