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Circulardichroismus und Elektronenanregungsspektren chiraler [2,2]Metacyclophane

Circulardichroism and electron absorption spectra of chiral [2.2]metacyclophanes

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Abstract

From the optical and chiroptical properties of substituted [2.2]metacyclophanes and a comparison with substituted [10]paracyclophanes as well as by symmetry arguments regarding prochiral carbophanes can be deduced that dipol-dipol coupling is not responsible for the generation of non-orthogonal electrical and magnetical moments in these compounds; pressmably one is dealing with an inherently achiral aromatic chromophore mainly perturbed by vibrations. Even in the exited state the assumption of transanular π-π-interactions in [2.2]metacyclophanes is not justified as can be seen from theCD-spectra.

Zusammenfassung

Aus den optischen und chiroptischen Eigenschaften substituierter [2,2]Metacyclophane, aus einem Vergleich mit substituierten [10]Paracyclophanen sowie aus Symmetriebetrachtungen an prochiralen Carbophanen kann geschlossen werden, daß für das Zustandekommen nicht-orthogonaler elektrischer und magnetischer Momente in diesen Verbindungen Dipol-Dipol-Kopplung nicht verantwortlich ist; vielmehr scheint es sich um eine hauptsächlich durch Schwingungen vermittelte Störung eines inhärent achiralen, aromatischen Chromophors zu handeln. Auf Grund desCD scheint die Annahme transanularer π-π-Wechselwirkungen in [2,2]Metacyclophanen auch im angeregten Zustand nicht gerechtfertigt.

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Langer, E., Lehner, H. Circulardichroismus und Elektronenanregungsspektren chiraler [2,2]Metacyclophane. Monatshefte für Chemie 104, 644–653 (1973). https://doi.org/10.1007/BF00910575

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  • DOI: https://doi.org/10.1007/BF00910575

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