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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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    Novel bridged binuclear ruthenium-aminophosphine complexes for the transfer hydrogenation of ketones using isopropanol: Synthesis, catalytic performance, and electrochemical behavior
    (ELSEVIER, 2025) Tanrıverdi Gergin, Zuhal; Toksoy, Mahmut Ozan; Işık, Uğur; Baysal, Akın; Güzel, Remziye; Aydemir, Murat; Durap, Feyyaz
    The starting material N,N '-bis(diphenylphosphino) ethane-1,2-diamine (1) was prepared for the first time in this study by a one-step reaction of 1,2-ethylenediamine with one equivalent of diphenylchlorophosphine. The reaction of 1 with either [Ru(p-cymene)(mu-Cl)Cl](2) or [Ru(benzene)(mu-Cl)Cl](2) afforded a series of novel bridged binuclear complexes of [C2H4-{NHPPh2-Ru(benzene)Cl-2}(2)], 1a and [C2H4-{NHPPh2-Ru(p-cymene)Cl-2}(2)], 1b, respectively. All newly synthesized complexes were comprehensively characterized using various analytical and spectroscopic techniques. H-1-, C-13-, P-31{H-1} NMR, (HH)-H-1-H-1 COSY or (HC)-H-1-C-13 HETCOR correlation experiments were employed to validate the spectral assignments. Both complexes are appropriate catalyst precursors for transfer hydrogenation of acetophenone derivatives. In particular, the complex [C2H4-{NHPPh2-Ru(benzene)Cl-2}(2)], referred to as 1a, demonstrates outstanding catalytic efficiency, by producing the relevant alcohols in 99 % conversion at 82 degrees C (TOF similar to 1200 h(-1)) in 5 min, outperforming analogous complexes in transfer hydrogenation reactions. Furthermore, the chemical characterizations, electronic transitions, and electrochemical properties of the Ru(II) complexes were systematically investigated by experimental methods.