Electronic Spectrum of the Cycloheptatrienyl (Tropylium) Ion

Abstract
The NV spectrum of the tropylium ion, C7H7+, is studied theoretically by the self‐consistent molecular orbital theory. Two transitions are anticipated, an allowed transition at 6.36 ev and a forbidden transition at 4.33 ev. The absorption band at 4.51 ev observed by von Doering and Knox is assigned to the latter transition.

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