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• W2134146094 abstract "Abstract The bi‐exponential emission decay of [Ru(L) 2 dppz] 2+ (L= N , N ′‐diimine ligand) bound to DNA has been studied as a function of polynucleotide sequence, enantiomer, and nature of L (phenanthroline vs. bipyridine). The lifetimes ( τ i ) and pre‐exponential factors ( α i ) depend on all three parameters. With [poly(dA‐dT)] 2 , the variation of α i with [Nu]/[Ru] has little dependence on L for Λ‐[Ru(L) 2 dppz] 2+ but a substantial dependence for Δ‐[Ru(L) 2 dppz] 2+ . With [poly(dG‐dC)] 2 , by contrast, the Λ‐enantiomer α i values depend strongly on the nature of L, whereas those of the Δ‐enantiomer are relatively unaffected. DNA‐bound linked dimers show similar photophysical behaviour. The lifetimes are identified with two geometries of minor‐groove intercalated [Ru(L) 2 dppz] 2+ , resulting in differential water access to the phenazine nitrogen atoms. Interplay of cooperative and anti‐cooperative binding resulting from complex–complex and complex–DNA interactions is responsible for the observed variations of α i with binding ratio. [Ru(phen) 2 dppz] 2+ emission is quenched by guanosine in DMF, which may further rationalise the shorter lifetimes observed with guanine‐rich DNA." @default.
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• W2134146094 date "2012-10-05" @default.
• W2134146094 modified "2023-10-18" @default.
• W2134146094 title "DNA Sequence and Ancillary Ligand Modulate the Biexponential Emission Decay of Intercalated [Ru(L)₂dppz]²⁺Enantiomers" @default.
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• W2134146094 doi "https://doi.org/10.1002/chem.201201279" @default.
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