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Role of the bridge in photoinduced electron transfer in porphyrin-fullerene dyads

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Details

Original languageEnglish
Pages (from-to)5814-5825
Number of pages12
JournalChemistry: A European Journal
Volume21
Issue number15
DOIs
Publication statusPublished - 2015
Publication typeA1 Journal article-refereed

Abstract

The role of π-conjugated molecular bridges in through-space and through-bond electron transfer is studied by comparing two porphyrin-fullerene donor-acceptor (D-A) dyads. One dyad, ZnP-Ph-C60 (ZnP=zinc porphyrin), incorporates a phenyl bridge between D and A and behaves very similarly to analogous dyads studied previously. The second dyad, ZnP-EDOTV-C60, introduces an additional 3,4-ethylenedioxythienylvinylene (EDOTV) unit into the conjugated bridge, which increases the distance between D and A, but, at the same time, provides increased electronic communication between them. Two essential outcomes that result from the introduction of the EDOTV unit in the bridge are as follows: 1)faster charge recombination, which indicates enhanced electronic coupling between the charge-separated and ground electronic states; and 2)the disappearance of the intramolecular exciplex, which mediates photoinduced charge separation in the ZnP-Ph-C60 dyad. The latter can be interpreted as a gradual decrease in electronic coupling between locally excited singlet states of D and A when introducing the EDOTV unit into the D-A bridge.

ASJC Scopus subject areas

Keywords

  • Conjugated bridge, EDOT, Electron transfer, Fullerene, Porphyrin

Publication forum classification

Field of science, Statistics Finland