Synthesis, structural characterization and cytotoxic activity of two new organoruthenium(II) complexes

Abstract

Two new p-cymene ruthenium(II) complexes containing as additional ligands N-methylpiperazine ([(?6-p-cymene)RuCl2(CH3NH(CH2)4NH)]PF6, complex 1) or vitamin K3-thiosemicarbazone ([(?6-p-cymene)RuCl2(K3tsc)], complex 2) were synthesized starting from [(?6-p-cymene)2RuCl2]2 and the corresponding ligand. The complexes were characterized by elemental analysis, IR, electronic absorption and NMR spectroscopy. The X-ray crystal structure determination of complex 1 revealed ?piano-stool? geometry. The differences in the cytotoxic activity of the two complexes are discussed in terms of the ligand present.