Mononuclear ruthenium(II) and rhodium(III) complexes with S-[4-(2,2:6′,2″-terpyridin-4′-yl)phenoxy]butyl ethanethioate and 4′-[4-(1,2-dithiolane-3-yl)butylcarboxy)phenyl]-2,2′:6′,2″-terpyridine: Synthesis, electrochemistry, antibacterial activity and catalytical application

Add time:07/31/2019    Source:sciencedirect.com

The synthesis and characterization of novel sulfur-containing terpyridine ligands and their ruthenium and rhodium complexes [Ru(tpy)2](PF6)2, [Rh(tpy)2](PF6)3, [Ru(phen)(tpy)Cl](PF6), [Rh(phen)(tpy)](PF6)2 (phen = phenanthroline; tpy = S-[4-(2,2:6′,2″-terpyridin-4′-yl)phenoxy]butyl ethanethioate or 4′-[4-(1,2-dithiolane-3-yl)butylcarboxy)phenyl]-2,2′:6′,2″-terpyridine) have been described. The complexes are redox-active, showing both metal-centered and ligand-centered processes. The data of electrochemical study confirm the chemisorption of complexes on the gold electrode surface. The antibacterial activity of the synthesized complexes was tested against two pathogens (Micrococcus luteus and Pseudomonas aeruginosa) by the well diffusion method. A biological study indicated that two complexes exhibit a good activity against M. luteus and the activity of symmetrical ruthenium complex [Ru(tpy-C4H4-O-C(O)-(CH2)4-C3H5S2)2](PF6)2 is better than the activity of the commercially available antibiotics streptomycin and kanamycin. It was shown that the ruthenium terpyridine–phenanthroline complex [Ru(phen)(Tpy-C6H4-O-(CH2)4-SCOCH3)Cl]PF6 efficiently catalyzed the oxidation of triphenylphosphine to triphenylphosphine oxide and styrene to styrene oxide with iodosobenzene in mild conditions.

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