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    Novel Benzimidazole- Platinum(II) Complexes: Synthesis, Characterization, Antimicrobial and Anticancer Activity
    (Elsevier, 2021) Dogan, Umut; Ozcan, Ozge; Alaca, Gizem; Ari, Aydan; Gunnaz, Salih; Yalcin, H. Tansel; Sahin, Onur
    Three new Platinum complexes (1-3) with 2,6-di-tert-butyl-4-(1-phenyl-1H-benzimidazol-2-yl) phenol (L-1), N, N-dimethyl-4-(1-phenyl-1H-benzimidazol-2-yl) aniline (L-2) and 4-(1H-benzimidazol-2-yl)-N, N-dimethylaniline (L-3) were prepared and characterized by FT-IR, NMR and Elemental analyses. The crystal structures of L-1, 1 and geometrical isomer of 1 (1a) were determined by X-Ray crystallography. The cytotoxic activities of the compounds were tested on against SHSY-5Y and U-87 cell lines. The antimicrobial evaluations of the compounds showed that they have a moderate antimicrobial effect on gram positive and gram negative bacteria. (C) 2020 Elsevier B.V. All rights reserved.
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    Öğe
    Novel Schiff base-Pt(ii) complexes: inhibition of Aβ aggregation via histidine interaction
    (Royal Soc Chemistry, 2026) Irisli, Sevil; Dogan, Umut; Gunnaz, Salih; Yurt, Fatma; Sahin, Onur
    In this study, three Schiff base ligands (L1-L3) and their novel platinum(ii) complexes (I-III) were synthesized and characterized using FT-IR, NMR, and elemental analysis. The crystal structure of complex I was determined by X-ray crystallography, while the lipophilicity of the complexes was evaluated by UV-Vis spectroscopy. The ability of the compounds to inhibit A beta aggregation was assessed using the SH-SY5Y human neuroblastoma cell line. Due to its high cytotoxicity, comparable to that of cisplatin, complex II was excluded from further biological investigations. The kinetics of A beta aggregation inhibition were examined fluorometrically using Thioflavin-T, and the binding interactions of the complexes with the A beta 1-42 sequence were elucidated through studies of their interactions with l-histidine using 1H-NMR and LC/QTOF/MS analyses. The results demonstrate that complexes I and III significantly suppress A beta fibril formation, with IC50 values of 50 mu M and 25 mu M, respectively. The enhanced biological activity is attributed to the strong electron-donating properties of the ligand substituents. Overall, these findings reveal that the synthesized complexes effectively inhibit A beta amyloid aggregation and promote cell viability.