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    Opto-electronic studies and diode applications: synthesis, characterization, and photoconductive properties of Schiff base and its Pd(II) and Pt(II) complexes
    (SPRINGER, 2025) Turan, N; Buldurun, K; Seymen, H; Gündüz, B; Çolak, N
    This research involved the creation of a Schiff base ligand, (E)-6-tert-butyl 3-ethyl 2-(3-methoxy-4-phenoxybenzylideneamino)-4,5-dihydrothieno[2,3-c]pyridine-3,6(7H)-dicarboxylate (SB), through the condensation reaction of 6-tert-butyl 3-ethyl 2-amino-4,5-dihydrothieno[2,3-c]pyridine-3,6(7H)-dicarboxylate with 3-methoxy-4-phenoxybenzaldehyde. The synthesized Schiff base was then used to form metal complexes with Pd(II) and Pt(II) metal ions. Various analytical techniques, including microanalysis (C, H, N, and S), FT-IR, H-1-NMR, C-13-NMR, UV-Vis., thermal analysis (TGA), powder XRD analysis, mass (ESI), molar conductivity, and magnetic susceptibility, were employed to confirm the structures of synthesized compounds. Spectroscopic data indicated that the Schiff base functions as a chelating agent, utilizing oxygen and nitrogen donor sites. The molar conductance measurements suggested that both complexes are non-electrolytic. A square planar structure was proposed for the Pd(II) and Pt(II) complexes. The study also investigated the electronic and photonic characteristics of the metal complexes under different conditions. Furthermore, a basic diode was fabricated using the metal complex, and its electronic and photonic characteristics were thoroughly investigated. Current-voltage (I-V) measurements showed that the diode based on the Pd(II) complex had notable noise and a high leakage current. On the other hand, the diode with the Pt(II) complex exhibited enhanced photoconductivity as the light intensity increased. [GRAPHICS] .
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    Öğe
    Preparation, Spectral Characterization and Antioxidant Activities of Aminothiophene-Containing Schiff Base and Co(II) and Pd(II) Complexes
    (WILEY, 2025) Çolak, N; Savcı, A; Turan, N; Buldurun, K
    This research focused on synthesizing a Schiff base (L) and its Co(II) and Pd(II) complexes under appropriate conditions to contribute to enhancing antioxidant activity. The ligand was synthesized by reacting methyl 2-amino-4-ethyl-5-methylthiophene-3-carboxylate with 5-bromo-2-hydroxybenzaldehyde. Various analytical techniques were employed to characterize the ligand and its resulting complexes, including microanalysis, H-1 and C-13 NMR spectroscopy, FTIR, electronic spectra, mass spectrometry, magnetic susceptibility, molar conductance, and thermo-gravimetric analysis. Electronic spectra and magnetic moment values were used to confirm the geometric structures of the synthesized compounds. Thermo-gravimetric analyses (TGA-DTA) were conducted to evaluate the thermal stability of the complexes. The Pd(II) complex was found to have a square planar structure, while a tetrahedral structure was suggested for the Co(II) complex. The results from the elemental analysis were consistent with both the ligand and metal complexes, showing good agreement between calculated and experimental values. The in vitro antioxidant activities of the newly synthesized compounds were examined using different antioxidant methods. Experiment results exhibited that the Pd(II) complex had better activities than the Schiff base and Co(II) complex. According to ABTS experimental results, Pd(II) complex (IC50:1.25) showed similar activity to the standards. In contrast, CUPRAC results revealed that Pd(II) complex (7.55 mu g TE/mL) showed better activity than the standards. The results indicate that Pd(II) complex has strong potential as effective antioxidants, making them valuable for food and medicine applications.