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Upon excitation into the metal-to-ligand charge transfer (MLCT) band, dppz complexes of Ru(II) are highly emissive when intercalated into DNA but show significant quenching when measured in aqueous buffer because of hydrogen bonding to the phenazine nitrogen atoms.
Thus, these complexes exhibit a ¡°lightswitch¡± effect in DNA  because intercalation of the dppz ligand into the DNA ¦Ð-stack protects the phenazine nitrogens from quenching by aqueous solvent, restoring luminescence

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