Ruthenium(II) complexes derived from the ligands having carboxamide groups: Reactivity and scavenging of nitric oxide (NO)

Two novel ruthenium(II) complexes [RuII(L1)(PPh3)2(CO)] (1) and [RuII(L3)(PPh3)2(DMF)] (2) derived from the carboxamide ligands L1H2 and L2H2 respectively (where L1H2 = N2,N6-dip-tolylpyridine-2,6-dicarboxamide and L2H2 = N2,N6-di(naphthalen-1-yl)pyridine-2,6-dicarboxamide) were synthesized and characterized. Molecular structures of complexes 1·CH3OH and 2·DMF were authenticated using X-ray crystallographic studies. Both the complexes were characterized using IR, UV–vis, elemental analysis, NMR and ESI-mass spectral studies. Electrochemical studies were performed to investigate the redox properties. Nitric oxide (NO) scavenging activity of these complexes was also observed with the help of Griess reagent reaction.