Abstract
Optical excitation of phenazine doped in a fluorene crystal induces a photochemical hydrogen abstraction reaction in which a hydrogen atom is abstracted from the CH 2-group of a fluorene host and transferred to the aza-group of the phenazine guest molecule. The resulting radical pair product in its triplet state is studied by EPR. Hyperfine structure has been resolved and assigned to the two guest nitrogen spins and the two proton spins originating from the fluorene CH 2-group including the transferred hydrogen. The results allow the characterization of the local molecular structure of the relevant groups both in the reactant as well as the product configuration.
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