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- W2008744531 abstract "New ligands, 2-(4-methoxyphenyl)imidazo[4,5-f][1,10]phenanthroline (MOP) and 2-(4-dimethylaminophenyl)imidazo[4,5-f][1,10]phenanthroline (DMNP) and their (bpy)2Ru2+ complexes (bpy = 2,2′-bipyridine), have been synthesized. Single crystal X-ray diffraction reveals that MOP is a planar molecule. The binding of the above two complexes, Ru(bpy)2NOP2+ and (NOP = 2-(4-nitrophenyl)imidazo[4,5-f][1,10]phenanthroline) to calf thymus DNA is investigated using various photophysical methods. Considerable absorption, hypo- and bathochromicity, as well as enantiomeric selectivity demonstrate that the complexes bind to DNA through intercalation of MOP, DMNP or NOP into the base pairs. The absorption change, regarding the DMNP or NOP localized transition, provides a unique ‘direct’ criterion. Steady-state emission enhancement, reduced accessibility to ferrocyanide quencher, and an excited-state lifetime increase are also observed for Ru(bpy)2MOP2+ and Ru(bpy)2DMNP2+ once bound to DNA. The monoexponential emission-decay profiles infer that the perpendicular intercalation might be the sole binding mode. Owing to a relatively low sensitivity to collision-quenching by neighboring molecules, the emission change of Ru(bpy)2DMNP2+ is lower than that of Ru(bpy)2MOP2+. No emission is observed for Ru(bpy)2NOP2+ due to intramolecular electron transfer caused by -NO2, which is unaffected by DNA." @default.
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- W2008744531 date "1998-12-01" @default.
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- W2008744531 title "Intercalation into calf thymus DNA of 2-(4-arylphenyl)imidazo[4,5-f]-[1,10]phenanthroline (aryl = -OMe, -NMe2 or -NO2) in its bipyridyl ruthenium(II) complex" @default.
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- W2008744531 doi "https://doi.org/10.1016/s0020-1693(98)00086-3" @default.
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