Abstract
Long-range photoinduced energy and electron transfer have been investigated in a novel dyad containing a zinc tetraarylporphyrin (P Zn) donor and a C 60 acceptor separated by a saturated norbornylogous bridge nine sigma bonds in length (P Zn-9σ-C 60). In non-polar solvents singlet-singlet energy transfer from P Zn to C 60 is observed but in benzonitrile efficient (> 90%) charge separation occurs with a rate constant of 1 × 10 10 sec −1 to yield P Zn .+-9σ-C 60 .−. The charge separated state exhibits a remarkably long lifetime for a dyad of 420 ns. This behaviour is discussed with reference to the energetics, dynamics and orbital symmetry properties of the states involved.
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