The photochemistry and photophysics of isoalloxazines (10-substituted 2, 3, 4, 10-tetrahydro-
benzo [g] pteridine-2, 4-diones), and especially flavins (7, 8-dimethyl substituted
isoalloxazines), are of considerable interest due to the biological relevance of these
compounds. In this paper we report data concerning the photophysics of riboflavin and iso-
(6, 7)-riboflavin (10-(2, 3, 4, 5-tetrahydroxypentyl)-6, 7-dimethylbenzo [g] pteridine-2, 4 (3H,
10H)-dione), and correlate the spectroscopic observations with theoretical calculations …