Abstract
Abstract A series of photochemical products of 5,10 dihydrophenazine (PH2) doped in fluorene (Fl) crystals can be observed via optical and ESR spectroscopy upon two photon excitation of PH2. ESR spectra reveal the formation of host-guest triplet radical pairs as a product of a double hydrogen abstraction. The non-planar PH2 ground state leads to a strong site distribution. Photochemical hole burning experiments indicate that this distribution determines to some extent the reaction rate.
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