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1.Ferricyanide ([Fe(CN)6]4-) quenching of the luminescence for the DNA-bound forms of the two enantiomers of tris(phenanthrolin)ruthenium(II) is shown, where the squares denote data for the Δ isomer and the circles correspond to the Λ isomer. Assume that the origin of the quenching is photoexcited electron transfer from the ruthenium reagent.
(1)Is the electron-transfer quenching arising from redox chemistry with the bound or free from of the Ru(phen)32+. Explain.
(2)Why was ferricyanide used in these quenching studies rather than a complex such
(3)Explain why the ratio Io/I is larger than unity.
(4)Which of the two enantiomers binds more tightly to B-DNA? What would be your prediction for selective binding to Z-DNA?
( Barton, J. K. et al., J. Am. Chem. Soc. 108, 2081-2088 (1986))
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