Synthesis, cyclic voltammetry, and photophysical properties of a bridged o-phenylenediamine-C-60 dyad

The synthesis, complete spectroscopic characterization, cyclic voltammetry, and photophysical measurements of a new omicron-phenylenediamine C-60 dyad are described. By using a tether strategy, only a single regioisomer was o btained. Cyclic voltammetry measurements indicate that the two electroactiv e groups do not interact in their singlet ground states. Photophysical inve stigations reveal a rapid photoinduced electron transfer between the single t excited state of the fullerene acceptor and the omicron-phenylenediamine donor, yielding a charge-separated radical pair.