Long-lived photoinduced charge separation in a bridged C60-porphyrin dyad

Toby D.M. Bell, Trevor A. Smith, Kenneth P. Ghiggino, Millagahamada G. Ranasinghe, Michael J. Shephard, Michael N. Paddon-Row

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Long-range photoinduced energy and electron transfer have been investigated in a novel dyad containing a zinc tetraarylporphyrin (PZn) donor and a C60 acceptor separated by a saturated norbornylogous bridge nine sigma bonds in length (PZn-9σ-C60). In non-polar solvents singlet-singlet energy transfer from PZn to C60 is observed but in benzonitrile efficient (>90%) charge separation occurs with a rate constant of 1 × 1010 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.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalChemical Physics Letters
Issue number3-4
Publication statusPublished - 11 Apr 1997
Externally publishedYes

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