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    Preparation and spectroscopic studies of Fe(II), Ru(II), Pd(II) and Zn(II) complexes of Schiff base containing terephthalaldehyde and their transfer hydrogenation and Suzuki-Miyaura coupling reaction
    (Sciendo, 2019) Turan, Nevin; Buldurun, Kenan; Colak, Naki; Ozdemir, Ismail
    This study describes synthesis, spectroscopic characterization and catalytic activities of Fe(II), Ru(II), Pd(II) and Zn(II) complexes with a novel Schiff base ligand (L) derived from methyl 2-amino-5,5,7,7-tetramethyl-4,5,6,7-tetrahydrobenzo[b] thiophene-3-carboxylate and terephthalaldehyde. We used spectroscopic techniques including IR, UV-Vis, H-1-NMR, C-13-NMR, elemental analysis and also mass analysis and magnetic susceptibility measurements to identify the products. The Pd(II) complex was used as a potential catalyst for Suzuki-Miyaura coupling reaction of some aryl halides under optimized conditions. The effect of various bases such as NaOH, KOH, and KOBut was investigated in transfer hydrogenation (TH) of ketones by isopropyl alcohol as the hydrogen source. Ru(II) and Pd(II) complexes showed catalytic activity while Zn(II) and Fe(II) metal complexes failed to do that.
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    Spectroscopic, antiproliferative and antiradical properties of Cu(II), Ni(II), and Zn(II) complexes with amino acid based Schiff bases
    (Springer Birkhauser, 2014) Genc, Zuhal Karagoz; Selcuk, Sibel; Sandal, Suleyman; Colak, Naki; Keser, Serhat; Sekerci, Memet; Karatepe, Mustafa
    Novel six Cu(II), Ni(II), and Zn(II) complexes with Schiff bases derived from 4-aminobenzoic acid with terephtaldehyde and amino acids (glycine, beta-alanine). Structures have been proposed from elemental analysis, UV-Vis, IR, NMR, TGA, DTA, and magnetic measurements. Spectroscopic studies suggest that coordination occurs through azomethine nitrogen, hydroxyl group, and carbonyl oxygen of the ligands to the metal ions. The elemental analyses of the complexes where L is Schiff base ligands, are confined to the stoichiometry of the type M2L2(CH3COO)(2) [M = Cu(II)]; and M2L(CH3COO)(2) [M = Ni(II) and Zn(II)]. The cytotoxicity activities of the compounds against human breast carcinoma MCF-7 cell line have been studied. Ligands and their Zn(II) compounds inhibited cell proliferation of MCF-7 cancer cell lines in a dose- and time-dependent manner. The free radical scavenging activity was measured by 1,1-diphenyl-2-picryl-hydrazil. Our results show that the synthesized compounds induced oxidative damage by increasing the lipid peroxidation in yeast since MDA formation was increased, and it could be concluded that the synthesized compounds caused oxidative stress. In addition, the antioxidant activities of the synthesized compounds were very much lower than those of standard antioxidants.
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    Synthesis, characterization and catalytic activities of some Schiff base ligands and Pd(II) complexes containing substituted groups
    (Elsevier, 2024) Buldurun, Kenan; Turan, Nevin; Altun, Ayhan; Colak, Naki; Ozdemir, Ismail
    In this manuscript, new Schiff bases (L1, L2) and their L1-Pd(II), L2-Pd(II) complexes were synthesized. The structures of the synthesized Schiff bases and Pd(II) complexes were determined with the aid of FT-IR, 1H and 13C NMR, elemental analysis, TGA, magnetic susceptibility, mass analysis, powder X-ray diffraction analysis and UV-vis methods. The catalytic activities of L1-Pd(II) and L2-Pd(II) were examined in Suzuki-Miyaura and Mizoroki-Heck C-C coupling reactions. This study clearly shows that palladium complexes based Schiff base ligands are versatile and effective catalysts for reactions important in the synthesis of sensitive and fine chemicals. They are suitable for catalyzing a wide range of reactions under mild experimental conditions.
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    Synthesis, structural characterization and biological activities of metal(II) complexes with Schiff bases derived from 5-bromosalicylaldehyde: Ru(II) complexes transfer hydrogenation
    (Elsevier Science Bv, 2019) Buldurun, Kenan; Turan, Nevin; Savci, Ahmet; Colak, Naki
    In this study, two novel Schiff base ligands (L-1 and L-2) derived from condensation of methyl 2-amino-6-methyl-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3-carboxylate and methyl 2-amino-6-phenyl-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate, both starting matter with 5-bromo-salicylaldehyde, and their Zn(II) and Ni(II) metal complexes have been prepared using a molar ratio of ligand:metal as 1:1 except the Ru(II) complexes 1:0.5. The structures of the obtained ligands and their metal complexes were characterized by elemental analysis, FT-IR, H-1 NMR, C-13 NMR, UV-vis, thermal analysis methods, mass spectrometry, and magnetic susceptibility measurements. Antioxidant and antiradical activity of Schiff base ligands and their metal complexes were been evaluated in vitro tests. Antioxidant activities of metal complexes generally were more effectives than free Schiff bases. 1c and 2c were used as catalysts for the transfer hydrogenation (TH) of ketones. 1c, 2c complexes were found to be efficient catalyst for transfer hydrogenation reactions. (C) 2018 King Saud University. Production and hosting by Elsevier B.V.