Photocontrolled nucleobase binding to an organometallic Ru(II) arene complex.

The complex [(p-cym)Ru(bpm)(py)][PF(6)](2) (where p-cym = para-cymene, bpm = 2,2'-bipyrimidine and py = pyridine) is the first ruthenium(ii) arene complex that can selectively photodissociate a monodentate ligand (py) when excited with visible light and form a reactive aqua derivative able to bind to a DNA base.

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