ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Synthesis of ionic liquid-based Ru(II)–phosphinite complexes and evaluation of their antioxidant, antibacterial, DNA-binding, and DNA cleavage activities

Nermin Meriç, Cezmi Kayan, Khadichakhan Rafikova, Alexey Zazybin, Veysi Okumuş, Murat Aydemir, and Feyyaz Durap

University of Dicle, Diyarbakir, Turkey

E-mail: cezmik@dicle.edu.tr

Abstract: Two Ru(II) complexes were synthesized by reaction of phosphinite-functionalized imidazolium salts [(Ph₂PO)C₇H₁₁N₂Cl]Cl (1) and [(Cy₂PO)C₇H₁₁N₂Cl]Cl (2) with 1/2 equivalent of [Ru(η⁶-p-cymene)(µ-Cl)Cl]₂ in anhydrous CH₂Cl₂ and under argon atmosphere. The complexes were then isolated as analytically pure substances and characterized using multinuclear NMR and infrared spectroscopies and elemental analysis. The Ru(II) compounds were used to study their biological assay. For this purpose, radical scavenging, reducing power, antibacterial activity, DNA binding, and DNA cleavage activity were fully studied. The maximum 1,1-diphenyl-2-picrylhydrazyl radicals (DPPH) scavenging (78.9%) and reducing power were obtained from compound 4 at the concentration of 200 µg/ml. The compounds were also tested against three Gram-positive and three Gram-negative bacteria, and they were found to be more effective against Gram-positive bacteria. In addition, both compounds showed excellent DNA binding and DNA cleavage activity.

Keywords: Ionic liquid ; Phosphinite ; Ruthenium ; Antibacterial ; DNA binding ; DNA cleavage 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-018-00670-0

Chemical Papers 73 (5) 1199–1208 (2019)