Abstract— Fluorescence and phosphorescence spectra of lumiflavine, riboflavine, FMN and FAD have been measured by continuous and flash excitation techniques. The differences in emission characteristics observed, show that the flavine side‐chains afect the singlet‐triplet transitions on which chemical and biological activity of flavine systems depend.

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Ultra-violet irradiation of cannabinol in ethanol results in ring opening to give the isomeric diol, which subsequently undergoes photoinduced dehydration and ring closure to a substituted phenanthrene.

The fluorescence and phosphorescence characteristics of lysergic acid diethylamide and a number of related ergolines have been examined. Fluorescence decay times have been determined using a time-correlated single photon counting technique. Pronounced changes were observed in the fluorescence spectra and decay times with change of solvent. These effects have been attributed to the change in both the dielectric constant of the solvent and the extent of dipole-dipole interaction in the excited state.

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