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Pure Appl. Chem., 2005, Vol. 77, No. 6, pp. 1035-1050

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.