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  • Title: Fullerene polypyridine ligands: synthesis, ruthenium complexes, and electrochemical and photophysical properties.
    Author: Zhou Z, Sarova GH, Zhang S, Ou Z, Tat FT, Kadish KM, Echegoyen L, Guldi DM, Schuster DI, Wilson SR.
    Journal: Chemistry; 2006 May 24; 12(16):4241-8. PubMed ID: 16575936.
    Abstract:
    Fullerene coordination ligands bearing one bipyridine or terpyridine unit were synthesized, and their coordination to ruthenium(II) formed linear rod-like donor-acceptor systems. Steady-state fluorescence of [Ru(bpy)(2)(bpy-C(60))](2+) showed a rapid solvent-dependent, intramolecular quenching of the ruthenium(II) MLCT excited state. Time-resolved flash photolysis in CH(3)CN revealed characteristic transient absorption changes that have been ascribed to the formation of the C(60) triplet state, suggesting that photoexcitation of [Ru(bpy)(2)(bpy-C(60))](2+) results in a rapid intramolecular transduction of triplet excited state energy. The electrochemical studies on both [Ru(bpy)(2)(bpy-C(60))](2+) and [Ru(tpy)(tpy-C(60))](2+) indicated electronic coupling between the metal center and the fullerene core.
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