@Article{EurJInorgChem_2010_4843, author = {M.E. Walther and J. Grilj and D. Hanss and E. Vauthey and O.S. Wenger}, title = {{Photoinduced Processes in Fluorene-Bridged Rhenium{\frac{ }{ }}Phenothiazine Dyads {\frac{ }{ }} Comparison of Electron Transfer Across Fluorene, Phenylene, and Xylene Bridges}}, journal= {Eur. J. Inorg. Chem.}, ISSN = {1434-1948}, volume= {2010}, number= {30}, pages = {4843-4850}, url = {http://onlinelibrary.wiley.com/doi/10.1002/ejic.201000645/abstract;jsessionid=E313278A2088E5E8498185AFC86CAC9F.d03t01}, eprint= {http://www.unige.ch/sciences/chifi/publis/refs_pdf/ref01206.pdf}, doi= {10.1002/ejic.201000645}, abstract = {{The photoinduced processes occurring after pulsed laser excitation of a series of donor{\frac{ }{ }}bridge{\frac{ }{ }}acceptor molecules comprising a phenothiazine electron donor, variable-length fluorene bridges, and a rhenium(I) electron acceptor were investigated. A dyad with a single fluorene bridge unit exhibits electron transfer from phenothiazine to the rhenium(I) complex upon photoexcitation, whereas in dyads with fluorene oligomers bridge-localized triplet excited states are formed rather than electron transfer products. In the monofluorene-bridged system with a donor{\frac{ }{ }}acceptor distance of ca. 15 Å, electron transfer occurs with a time constant of 1.9 ns. The equidistant electron transfer between the same donor and acceptor is considerably slower across a biphenyl bridge (3.9 ns) or a bi-{\em p}-xylene spacer (20 ns). This finding is interpreted in terms of different tunneling barrier heights associated with the charge transfer across the three different types of molecular bridges.}}, year = {2010} }