( DMSO ) has been shown to inhibit topoisomerase II, an important target in chemotherapy (13). Another Ru-arene compound with anticancer attributes contains a iodido ligand and a s-donor/p-acceptor phenylazopyridine ligand. 8     Figure 14. [( h 6 -arene)Ru(az-py)I] +    This set of compounds has shown superior inertness with