Electronic energy transfer in dinuclear metal complexes containing meta-substituted phenylene units*
A. D'Aléo, S. Welter, E. Cecchetto, and L. De Cola
Universiteit van Amsterdam, HIMS, Nieuwe Achtergracht, 166, 1018 WV Amsterdam, The Netherlands
Abstract: The synthesis and photophysical properties of heterometallic dinuclear complexes based on ruthenium and osmium trisbipyridine units, Ru-mPh3-Os and Ru-mPh5-Os, in which the metal complexes are linked via an oligophenylene bridge centrally connected in the meta position, are described. Electronic energy transfer from the excited ruthenium-based component (donor) to the osmium moiety (acceptor) has been investigated using steady-state and time-resolved spectroscopy. The results obtained for the meta-substituted compounds are compared with the analogous systems in which the phenylene spacers are substituted in the para position. The mechanism of energy transfer is discussed.
Keywords: luminescence; ruthenium complexes; osmium complexes; energy transfer; conjugated systems.
*Paper based on a presentation at the XXth IUPAC Symposium on Photochemistry, Granada, Spain, 17-22 July 2004. Other presentations are published in this issue, pp. 925-1085.