title: Photodynamics of excitation energy transfer in self-assembled dyads. Evidence for back transfer.
abstract: Three self-assembled photonic dyads comprising a zinc porphyrin donor and a free base acceptor have been studied by time-resolved fluorescence spectroscopy. The driving force of the assembly is the site selective binding of an imidazole connected to a free base porphyrin. Three spacers have been incorporated between the imidazole connector and the free base porphyrin, providing three different distances separating the donor and the acceptor. The high efficiencies and the rates of energy transfer in the set of dyads is consistent with the Forster energy transfer mechanism. Evidence for Forster back transfer has been obtained, and its efficiency and rate have been quantitatively evaluated for the first time.
authors.affiliation: CNRS UMR 8531, Laboratoire PPSM, ENS-Cachan, 94235, Cachan cedex, France.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Leray
authors.forename: Bernard
authors.initials: B
authors.lastname: Valeur
authors.forename: Dharam
authors.initials: D
authors.lastname: Paul
authors.forename: Emilie
authors.initials: E
authors.lastname: Regnier
authors.forename: Matthieu
authors.initials: M
authors.lastname: Koepf
authors.forename: Jennifer A
authors.initials: JA
authors.lastname: Wytko
authors.forename: Corinne
authors.initials: C
authors.lastname: Boudon
authors.forename: Jean
authors.initials: J
authors.lastname: Weiss