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    Structural investigation and application of ruthenium(II)-benzimidazole complexes for N-alkylation
    (Elsevier Science Sa, 2025) Karabekmez, Funda Dogan; Karaca, Emine Ozge; Gurbuz, Nevin; Ozdemird, Namik; Ozdemir, Ismail
    The N-substituted ligands (1a-d) were synthesized through the reaction of benzimidazole and a base with alkyl halides. After that, a new series of N-coordinated benzimidazole ruthenium(II) complexes (2a-d) was synthesized in this study. 1H and 13C NMR spectroscopy, elemental analysis and FT-IR spectroscopy methods were applied to examine the structures of the complexes. The structures of complexes 2a-c were additionally elucidated by X-ray diffraction spectroscopy. Arylmethyl alcohols have been alkylated with these complexes in the presence of KOtBu under solvent-free mild conditions at 120 degrees C. These complexes catalyzed the N-alkylation process, yielding secondary amines from primary amines with great selectivity. Without using solvents, these complexes are found to be effective catalysts for the alkylation of aromatic amines with various alcohols. Given the structural similarity of the ruthenium complexes, it is clear that there is no substantial difference in their catalytic activity; however, the selectivity of the reaction is dependent upon the characteristics of the amines and alcohols involved.
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    Synthesis, crystal structure, DFT studies and catalytic activity of an N-(2,2-dimethyl-1,3-dioxolane-4yl-methyl)benzimidazole ruthenium(II) hydrate complex
    (Elsevier, 2023) Ozdemir, Namik; Karabekmez, Funda Dogan; Karaca, Emine Ozge; Gurbuz, Nevin; Ozdemir, Ismail
    In this study, the new N-coordinated benzimidazole ruthenium(II) complex was synthesized. The complex was fully characterized by FT-IR, 1 H and 13 C NMR spectroscopic methods. The molecular structure of the complex has been verified by X-ray crystallography. Besides, theoretical structure and spectroscopic data were obtained using density functional theory (DFT/HSEH1PBE) method with the cc-pVDZ basis set for C, H, N, O and Cl atoms, and the LANL2DZ basis set for the metal atom, and compared with the experimental data. This complex has also been tested for the N-alkylation of aromatic amines with arylmethyl alcohols under neat conditions in the presence of KOBut.(c) 2023 Elsevier B.V. All rights reserved.