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Rigid dinuclear ruthenium-arene complexes showing strong DNA interactions.
Journal of Inorganic Biochemistry 2018 August 25
Six novel dinuclear Ru(II)-arene complexes [Ru2 (η6 -p-cymene)2 (1,3-bib)2 Cl2 ]×2 ·Solvent (X = Cl- (1), I- (2), NO3 - (3), BF4 - (4), PF6 - (5), CF3 SO3 - (6); 1,3-bib = 1,3-di(1H-imidazol-1-yl) benzene) were synthesized and fully characterized by FT-IR, 1 H NMR, ESI-MS, Elemental Analysis (EA) and Powder X-ray Diffraction (PXRD). Single crystal X-ray diffractions studies showed that 3 and 4 have rigid bowl-like structures, where one counter-anion (NO3 - for 3 and BF4 - for 4) was trapped inside the cavity to balance the charge, respectively. Even complexes 1-6 showed only moderate or little anti-proliferative activity toward cancer cells, strong interactions with DNA molecules through intercalation, however, were confirmed by UV-Vis, CD and fluorescence spectroscopy. Apoptosis and cell cycle arrest studies for complex 2 with cancer A549 cells indicated concentration-dependent late apoptosis and the G1/G0 phase arrest. Interactions with the tripeptide glutathione (γ-L-Glu-L-Cys-Gly, GSH) might explain the relatively low antiproliferative potency of these complexes. This class of rigid dinuclear cations hold potential as DNA-targeting anticancer agents if their uptake and delivery could be under controlled.
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