Enantiopure lanthanide complexes incorporating a tetraazatriphenylene sensitiser and three naphthyl groups: exciton coupling,intramolecular energy transfer,efficient singlet oxygen formation and perturbation by DNA binding |
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Authors: | Bobba Gabriella Bretonnière Yann Frias Juan-Carlos Parker David |
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Institution: | Department of Chemistry, University of Durham, South Road, Durham, UK DH1 3LE. |
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Abstract: | In cationic nine-coordinate chiral terbium and europium complexes incorporating exciton-coupled naphthyl groups and a tetraazatriphenylene sensitising chromophore, efficient intramolecular energy transfer occurs leading to population of the naphthyl triplet state. With the terbium complex, the absolute quantum yield of singlet oxygen formation is 51% (lambda(exc) 355 nm), and for the Eu complex the intensity of metal-based emission increases by up to 350% on binding to poly(dGdC) or calf-thymus DNA, and was greater for the delta-isomer. |
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