Abstract
It is shown that the near ultraviolet absorption band of Michler's ketone covers three electronic transitions. There are two ππ* transitions, an intense one polarized perpendicular to the dipole moment and a weaker one at higher energy polarized parallel to the dipole moment, and an nπ* transition polarized parallel to the dipole moment. For the ππ* transitions the change of dipole moment upon excitation has been determined as 5.8 ± 0.5 and 3 ± 1 Debye, respectively. Whereas the nπ* state appears to be the first excited singlet state in non-polar media, it becomes the third excited singlet state in ethanol. The change of the absorption spectrum with temperature is discussed.
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