title: Energy versus Electron Transfer: Controlling the Excitation Transfer in Molecular Triads.
abstract: The photochemistry of RuIIcoordination compounds is generally discussed to originate from the lowest lying triplet metal-to-ligand charge-transfer state (3MLCT). However, when heteroleptic complexes are considered, for example, in the design of molecular triads for efficient photoinduced charge separation, a complex structure of1MLCT states, which can be populated in a rather narrow spectral window (typically around 450 nm) is to be considered. In this contribution we show that the localization of MLCT excited states on different ligands can affect the following ps to ns decay pathways to an extent that by tuning the excitation wavelength, intermolecular energy transfer from a RuII-terpyridine unit to a fullerene acceptor can be favored over electron transfer within the molecular triad. These results might have important implications for the design of molecular dyads, triads, pentads and so forth with respect to a specifically targeted response of these complexes to photoexcitation.
authors.affiliation: Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743, Jena, Germany.|Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Strasse 9, 07745, Jena, Germany.
authors.forename: Yusen
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, 07743, Jena, Germany.|Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743, Jena, Germany.
authors.forename: Kevin
authors.initials: K
authors.lastname: Barthelmes
authors.affiliation: Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Strasse 9, 07745, Jena, Germany.
authors.forename: Maria
authors.initials: M
authors.lastname: Wächtler
authors.affiliation: Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, 07743, Jena, Germany.|Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743, Jena, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Winter
authors.affiliation: Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, 07743, Jena, Germany.|Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich-Schiller-University Jena, Humboldtstrasse 10, 07743, Jena, Germany.
authors.forename: Ulrich S
authors.initials: US
authors.lastname: Schubert
authors.affiliation: Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743, Jena, Germany.|Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Strasse 9, 07745, Jena, Germany.|Jena Center for Soft Matter (JCSM), Friedrich-Schiller-University Jena, Philosophenweg 7, 07743, Jena, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dietzek
keywords: MLCT excited states; charge transfer; charge-separated state; electron transfer; ruthenium