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[Cu(phen)(2)](2+) (phen=1,10-phenanthroline) is the first and still one of the most efficient artificial nucleases. In general, when the phen ligand is modified, the nucleolytic activity of its Cu-II complex is significantly reduced. This is most likely due to higher steric bulk of such ligands and thus lower affinity to DNA. Cu-II complexes with phen ligands having fluorinated substituents (F, CF3, SF5, SCF3) surprisingly showed excellent DNA cleavage activity-in contrast to the unsubstituteddoi:10.17169/refubium-29578 fatcat:b5fpfnnohndotlx6eri4mcykoa