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Either way: An IrIII complex strongly coupled to a DNA base stack can inject a hole or an electron in DNA upon irradiation (see picture). With strands containing the modified bases CPA and CPC/BrU, which serve as oxidative and reductive probes, respectively, photolysis of Ir–DNA conjugates leads to a “ping-pong” electron transfer, with both hole and electron migration.
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Elias et al. (2008) studied this question.
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