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    Tris(benzimidazole)(nitrato)silver(I) complexes: Synthesis, catalytic activities, and biological evaluation
    (Elsevier, 2026) Boubakri, Lamia; Hallab, Wissem; Karci, Huseyin; Attour, Anis; Dundar, Muhammed; Ozdemir, Lknur Lknur; Gurbuz, Nevin
    In this study new N-alkylbenzimidazole derivatives 1a-e and their related tris(benzimidazole)(nitrato)silver(I) complexes 2a-e were prepared and characterized by FT-IR, 1H,13C{1H} NMR spectroscopy, and elemental analysis, which support the proposed structures. Further confirmations of structural details were provided by a single-crystal X-ray. A single crystal of tris(N-alkylbenzimidazole)(nitrato)silver(I) 2e shows that the coordination geometry around Ag slightly distorted tetrahedral geometry. Further, the synthesized compounds were evaluated for their antimicrobial activities against bacteria Escherichia coli, P. aeruginosa, S. aureus, and the fungal strains C. albicans and C. glabrata. The results indicated that the activity shown by the tested compounds, especially against Gram-negative bacteria, is valuable for the development of new treatment options against these microorganisms. Especially, the drug development potential of N-alkyl-5,6-dimethylbenzimdazole 1b and complexes 2b, 2c, and 2e showing the highest antimicrobial activity. Also, the alkylbenzimidazole substituent 1b and 1e and the Tris(1-alkylbenzimidazole)silver(I) 2c showed remarkable activity against fungi strains. Complexes 2a, 2b, 2c, 2d, and 2e also showed high cytotoxicity. The synthesized complexes demonstrated higher cytotoxicity relative to Cisplatin across all tested cell lines. Furthemore, a mild catalytic protocol for benzaldehyde, amine, and phenylacetylene coupling (A3-coupling) allows for the selective synthesis of propargyl amines using N-alkylbenzimidazole silver(I) nitrate catalysts with conversion of 100 %. The present approach is environmentally benign and water is generated as the sole by product.