Abstract
Photochemical products of dihydrophenazine (PH 2) in fluorene single crystals are investigated by optical and ESR spectroscopy. ESR spectra reveal the formation of guest-host triplet radical pairs as products of a double hydrogen elimination, whereas optical spectra elucidate some aspects of the primary multi-step decomposition of PH 2. Photochemical hole burning on PH 2 indicates an inhomogeneous photoreaction since PH 2 molecules differing in electronic conformations react with different reaction rates.
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