THE ELECTRONIC SPECTRUM OF CONJUGATED DICARBONYLS

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1968

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Ohio State University

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The absorption and emission spectrum, optical rotatory dispersion and circular dichroism of camphorquinone, a rigid molecule containing the four atom system of carbon and oxygen common to biacetyl, glyoxal and a host of similar compounds, exhibit two relatively weak and three stronger transitions between 20,000 and $56,000 cm^{-1}$. The longest wavelength transition is related to that of the symmetry forbidden $29,400 cm^{-1}$ transition of formaldehyde. The first two transitions contain most of the rotational strength of the corresponding long wavelength transition of the mono-ketone, camphor. The second transition is uniquely sharp at room temperature and exhibits a rather long vibrational progression indicating the possibility of a change in geometry of the upper state.

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Author Institution: National Institutes of Health, Bethesda

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