Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 177, Issue 2-3, Pages 286-294Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2005.06.008
Keywords
calf thymus DNA; photocleave; ruthenium; singlet oxygen
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Six Ru(II)bis(tpy) (tpy = 2,2':6.2-terpyridine) complexes, functionalized with one or two 2-naphthyl, 1-pyrenyl, or 9-anthracenyl at 4'-position of terpyridine respectively, were investigated with emphasis on their O-1(2) generation quantum yields and photocleavage capabilities on DNA. For naphthyl and pyrenyl modified complexes, the lowest energy excited state is (MLCT)-M-3, and therefore they behave very similarly to the parent complex, [Ru(tPY)(2)](2+). having very low O-1(2) generation quantum yields. In contrast, for anthracenyl modified complexes, the lowest energy excited state is anthracene-localized (3)pi pi(*) state, as a result, they exhibit extremely high O-1(2) generation quantum yields (0.96 and 0.71 for bis- and mono-substituted complexes, respectively) and potent photodamage abilities on calf thymus DNA, suggesting their promising applications in O-1(2)-involved processes, such as DNA photocleavage. (c) 2005 Elsevier B.V. All rights reserved.
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