Herein, we explore the coordination of di- and triimine chelators at
ruthenium(II) and ruthenium(III) centers. The reactions of 2,6-bis-((4-
tetrahydropyranimino)methyl)pyridine (thppy), N1,N2-bis((3-chromone)
methylene)benzene-1,2-diamine (chb), and tris-((1H-pyrrol-2-ylmethylene)
ethane)amine (H3pym) with trans-[RuIICl2(PPh3)3] afforded the diamagnetic
ruthenium(II) complex cis-[RuCl2(thppy)(PPh3)] (1) and the paramagnetic
complexes [mer-Ru2(μ-chb)Cl6(PPh3)2] (2), and [Ru(pym)] (3), respectively.
The complexes were characterized by IR, NMR, and UV–vis spectroscopy
and molar conductivity measurements. The structures were confirmed by
single crystal X-ray diffraction studies. The redox properties of the metal
complexes were probed via cyclic- and squarewave voltammetry. Finally, the
radical scavenging capabilities of the metal complexes towards the NO and
2,2-di(4-tert-octylphenyl)-1-picrylhydrazyl (DPPH) radicals were investigate
