Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 1, Issue 11, Pages 1870-1872Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b303085g
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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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