INTERACTION BETWEEN HYPOCRELLIN AND ALIPHATIC-AMINES

The interaction of hypocrellin, including hypocrellin A (HA) and hypoc rellin B (HB), with aliphatic amines in deaerated solutions has been s tudied by ESR and nanosecond transient absorption spectra In polar sol vents, the add-base interaction between hypocrellin and amines was obs erved without irradiation. The signals of semiquinone radial anions of hypocrellin and the spin-trapping adduct of alpha-phenyl-N-tertbutyln itrone (PNB) with the aminoalkyl radicals have been detected in photoi nduced ESR studies. The transient absorption of excited triplet state of HA and semiquinone radial anion of HA have been observed in laser f lash photolysis studies.