Benzil, which adopts a near-planar cisoid geometry on an excitaion in an ethylene glycol glass, and 10,11-dihydro-5H-dibenzo[a,d]cycloheptene-10,11-dione, which has a rigid near-planar cisoid conformation, phosphoresce from the second triplet state.
H. Inoue and T. Sakurai, J. Chem. Soc., Chem. Commun., 1983, 314 DOI: 10.1039/C39830000314
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