Journal of Physical Chemistry p. 7926 - 7931 (1993)
Update date:2022-08-02
Topics:
Gust, Devens
Moore, Thomas A.
Moore, Ana L.
Leggett, Lana
Lin, Su
et al.
A porphyrin dyad designed to facilitate vectorial interporphyrin electron transfer has been synthesized and studied using steady-state and time-resolved absorption and emission spectroscopies.The dyad features a zinc tetraarylporphyrin bearing electron-donating substituents linked by an amide bond to a free base porphyrin carrying electron-withdrawing groups.Excitation of the zinc porphyrin moiety in dichloromethane solution is followed by singlet energy transfer to the free base and concurrent electron transfer to the same moiety to yield a charge-separated state.The free base first excited singlet state decays by accepting an electron from the zinc porphyrin to form the same charge-separated state.Similar results are observed in butyronitrile.Transient absorption studies in butyronitrile verify the formation of a short-lived (8 ps) charge-separated state from the porphyrin first excited singlet states.The results support the suggestion that fluorescence quenching in related porphyrin dyads and carotenoid-diporphyrin triads is due to photoinduced electron transfer, rather than some other decay processes.
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