Synthesis, spectroscopic, electrochemical and antibacterial studies of new Ru(II) 1,10-phenanthroline complexes containing aryldiazopentane-2,4-dione as co-ligand

Abstract

Mononuclear and dinuclear Ru(II) complexes of 1,10-phenanthroline containing aryldiazopentane-2,4-diones (L¹H–L³H₂) as co-ligands were prepared and characterised using IR, ¹H NMR, UV/Vis spectra in addition to their elemental analysis and FAB mass spectral data. A representative ligand L²H₂ and its complex [Ru₂L²(phen)₄]²⁺ (phen=1,10-phenanthroline) were characterised also by ¹H–¹H COSY, TOCSY and ¹H–¹³C HMBC spectral data. Electrochemical behaviour of the complexes was studied in acetonitrile solution and showed irreversible Ru^II/Ru^III redox couples. Luminescence and UV/Vis spectral properties of the complexes in the presence and absence of buffered solutions of calf thymus DNA were also compared. Antibacterial activity of the complexes has been evaluated against Pseudomonas aeruginosa.