Three Ruthenium(II) polypyridine complexes, [Ru(phen)2(mipc)](2+)(1), [Ru(bpy)2(mipc)](2+) (2) and [Ru(dmb)2(mipc)](2+)(3) [mipc = 2-(6-methyl-3-(1H-imidazo[4, 5-f][1,10]-phenanthroline-2-yl)-4H-chromene-4-one, phen = 1,10-phenanthroline,bpy = 2, 2'bipyridine,dmb = 4, 4'-dimethyl-2, 2'-bipyridine] have been synthesized and characterized by elemental analysis, IR, UV-Vis, (1)H& (13)C NMR and mass spectra. The DNA-binding properties of the Ruthenium(II) complexes were investigated by spectrophotometric methods, viscosity measurements and light switch studies. These three complexes have been focused on photo activated cleavage studies with pBR-322 and antimicrobial studies. Experimental results indicate that the three complexes intercalate into DNA base pairs and follows the order of 1 > 2 > 3 respectively. Molecular docking studies also support the DNA interactions with complexes through hydrogen bonding and vander Waal's interactions. Cytotoxicity studies with Hela cell lines has been revealing about anti tumor activity of these complexes.
Four new ruthenium(II) polypyridyl complexes-[Ru(phen)2(7-F-dppz)](2+) (7-F-dppz is 7-fluorodipyrido[3,2-a:2',3'-c]phenazine, phen is 1,10-phenanthroline), [Ru(bpy)2(7-F-dppz)](2+)(2) (bpy is 2,2'-bipyridine), [Ru(dmb)2(7-F-dppz)](2+) (dmb is 4,4'-dimethyl-2,2'-bipyridine), and [Ru(hdpa)2(7-F-dppz)](2+) (hdpa is 2,2'-dipyridylamine)-have been synthesized and characterized. Their DNA binding behavior has been explored by various spectroscopic titrations and viscosity measurements, which indicated that all the complexes bind to calf thymus DNA by means of intercalation with different binding strengths. The light switching properties of these complexes have been evaluated, and their antimicrobial activities have been investigated. Photoinduced DNA cleavage studies have been performed. All the complexes exhibited efficient photocleavage of pBR322 DNA on irradiation. The cytotoxicity of these complexes has been evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay with various tumor cell lines. Cellular uptake was studied by flow cytometry and confocal microscopy. Flow cytometry experiments showed that these complexes induced apoptosis of HeLa cell lines.
Three ruthenium(II) polypyridyl complexes, [Ru(phen)(mip)](ClO) (1) (phen =1,10-Phenanthroline), [Ru(bpy)(mip)](ClO) (2) (bpy = 2,2'bipyridyl) and [Ru(dmb)(mip)](ClO) (3) (dmb = 4, 4'-dimethyl 2, 2'-bipyridine), were synthesized with an intercalative ligand mip (2-morpholino-1H-imidazo[4,5-f][1, 10]phenanthroline) and characterized by H,C-NMR, IR, UV-vis, mass spectra and elemental analysis. pH effect, ion selectivity (cations, anions) and solvent sensitivity of complexes were studied. The interaction of these complexes with DNA was performed using absorption, emission spectroscopy and viscosity measurements. The experimental results indicated that the two complexes interacted with calf thymus DNA (CT-DNA) by intercalative mode. BSA (Bovine Serum Albumin) protein binding of these complexes was studied by UV-visible and fluorescence techniques. The binding capacity of these complexes was explained theoretically by molecular docking method.
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