Optical activity of biphenyl derivatives: The .PI.-.PI. and n-.PI. transitions of o,o'-dinitrobiphenyls.

概要

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The optical rotatory power for the lower electronic transitions of several o,o′-dinitrobiphenyl derivatives is examined on the basis of a theoretical method previously developed and applied to metal chelate compounds and binaphthyl derivatives. The theoretical energy, absorption intensity, and rotational strength are shown to be in reasonable agreement with the observed absorption and circular dichroism spectra, confirming the applicability of the theory to the optical activity of this simple type of dissymmetric molecules. In addition, the origin of the rotational strength for the n-π* transition is examined in detail. The results indicate that the n-π* transition gains its intensity and rotatory power through the interaction of the nonbonding electrons in a nitro group with the π electron system in the other nitrobenzene ring.
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