“…The reaction was performed in the dark even though no photochemical activation of the present ruthenium complexes has been observed, in contrast to other ruthenium complexes. [27,28] Delay of SC DNA was observed for complexes 1, 2, 3 and 7. In addition, a modest increase in the amount of OC DNA was observed, relative to untreated DNA, which indicates that some DNA cleavage may also occur.…”