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Energy versus Electron Transfer: Controlling the Excitation Transfer in Molecular Triads
Author(s) -
Luo Yusen,
Barthelmes Kevin,
Wächtler Maria,
Winter Andreas,
Schubert Ulrich S.,
Dietzek Benjamin
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201700413
Subject(s) - photoexcitation , intermolecular force , excitation , triad (sociology) , excited state , chemistry , electron transfer , acceptor , chemical physics , photoinduced electron transfer , photochemistry , atomic physics , molecule , physics , psychology , organic chemistry , quantum mechanics , psychoanalysis , condensed matter physics
Abstract The photochemistry of Ru II coordination compounds is generally discussed to originate from the lowest lying triplet metal‐to‐ligand charge‐transfer state ( 3 MLCT). However, when heteroleptic complexes are considered, for example, in the design of molecular triads for efficient photoinduced charge separation, a complex structure of 1 MLCT 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 Ru II –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.