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    Advanced-designed Ru(II) complexes containing phosphinite ligands derived from chiral amino alcohols: Electrochemical behavior, DFT calculations, and biological activity
    (Elsevier Ltd, 2024) Meriç, Nermin; Işık, Uğur; Dauletbakov, Anuar; Zolotareva, Darya; Zazybin, Alexey; Sever, Mehmet Şerif; Okumuş, Veysi; Ertekin Binbay, Nil; Binbay, Veysel; Kayan, Cezmi; Güzel, Remziye; Aydemir, Murat
    We report two phosphinite ligands derived from chiral amino alcohols, and their complexes with ruthenium(II). These compounds were characterized by spectroscopic methods. Then, antimicrobial, antioxidant, and DNA binding activities of the chiral Ru(II)-phosphinite complexes were tested. Complex (1R)-2-{benzyl[(1S)-1(naphthalen-1-yl)ethyl]amino}-1-phenylethyl diphenylphos- phinito[dichloro(eta 6-p-cymene)ruthenium(II)], 7 showed both the highest radical scavenging activity (90.93 +/- 0.98 %) and the highest metal chelating activity (65.45 +/- 1.46 %) at 200.0 mg l-1 concentration. In addition, all of complexes had different rates of binding activity to calf thymus DNA (CT-DNA). Moreover, extensive theoretical and experimental investigations were conducted to gain a more profound understanding of the chemical descriptors and the diverse electronic transitions taking place within the ruthenium complexes, as well as their electrochemical characteristics.
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    Half-sandwich ruthenium(II) and iridium(III) complexes of imidazole based phosphinite ligands: antioxidant and antibacterial activities as well as electrochemical properties
    (John Wiley and Sons Inc, 2024) Işık, Uğur; Rafikova, Khadichakhan; Meriç, Nermin; Güzel, Remziye; Kerimkulova, Aygül; Akimbek, Arailym; Okumuş, Veysi; Durap, Feyyaz; Kayan, Cezmi; Aydemir, Murat
    Ruthenium(II) and iridium(III) complexes of phosphinites including imidazole moiety were synthesized and characterized by microanalysis, IR, MS, and NMR spectroscopies. Antibacterial activity against Gram-positive and Gram-negative bacterial strains was assessed in all complexes. The highest radical scavenging (72.2 %) was obtained for [3-(3-chloro-2-({[dichloro(?6-benzene)ruthenium]diphenylphosphanyl}oxy)propyl)-1-butyl-1H-imidazol-3-ium chloride], 4 at 200 ?g/mL concentration, while [3-(3-chloro-2-({[dichloro(??-pentamethylcyclopentadienyl)-iridium]diphenylphosphanyl}oxy)pro-pyl)-1-butyl-1H-imidazol-3-ium chloride], 6 demonstrated the highest antibacterial activity as 13 mm inhibition zone against E. hirea. Furthermore, optical and electrochemical featured of metal complexes containing imidazole phosphinite were investigated utilizing UV–vis absorption and cyclic voltammetry techniques. Consequently, all complexes can be proposed as metal-based charge convertible phosphinite complexes which may be employed as new generation and synergistic Dye-Sensitized Solar Cell (DSSC) materials.
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    Synthesis of half-sandwich ruthenium(II) and iridium(III) complexes containing imidazole-based phosphinite ligands and their use in catalytic transfer hydrogenation of acetophenone with isopropanol
    (Elsevier B.V., 2023) Işık, Uğur; Meriç, Nermin; Kayan, Cezmi; Kılıç, Ahmet; Belyankova, Yelizaveta; Zazybin, Alexey; Aydemir, Murat
    Two ionic liquids (3-(3‑chloro-2-hydroxypropyl)-1-vinyl-1H-imidazol-3-ium chloride and 3-(3‑chloro-2-hydroxypropyl)-1‑butyl‑1H-imidazol-3-ium chloride) were prepared from commercially available, inexpensive 1-vinyl imidazole or 1‑butyl imidazole, respectively, in ethanol at room temperature. Then, these ionic liquids were treated with PPh2Cl to obtain ionic liquid-based phosphinite ligands and the reaction of these phosphinites with [Ru(η6-benzene)(μ-Cl)Cl]2, [Ru(η6−p-cymene)(μ-Cl)Cl]2, or [Ir(η5-C5Me5)(μ-Cl)Cl]2 gave the corresponding ruthenium and iridium complexes. Structures of the synthesized compounds were clarified by multinuclear NMR and IR spectroscopy as well as microanalysis. Furthermore, the complexes were applied as catalysts in the transfer hydrogenation of acetophenone derivatives to afford the corresponding alcohols with high conversions. Notably, [Ru(Ph2PO–C8H11N2Cl2)(η6-benzene)Cl2] acts as a good catalyst, giving the corresponding alcohols in 97–98% yields in 15 min at 82 °C (TOF ≤ 400 h−1) for the transfer hydrogenation reaction in comparison to analogous complexes. The catalysts are also useful for a variety of related ketone substrates with various electronic and steric regulating groups.