The excited state of the 1,4,5,8-tetra-azaphenanthrene complex, [Ru(TAP)3]2+, which unlike [Ru(phen)3]2+(phen = 1,10-phenanthroline) or [Ru(bipy)3]2+(bipy = 2,2′-bipyridyl) is strongly quenched upon binding to poly[d(G–C)], is found to be much more effective than either [Ru(phen)3]2+ or [Ru(bipy)3]2+ in causing cleavage of the DNA backbone.
J. M. Kelly, D. J. McConnell, C. OhUigin, A. B. Tossi, A. K. Mesmaeker, A. Masschelein and J. Nasielski, J. Chem. Soc., Chem. Commun., 1987, 1821 DOI: 10.1039/C39870001821
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