Yazar "Senkuytu, Elif" seçeneğine göre listele

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    Synthesis of a novel N,N?,N?-tetraacetyl-4,6-dimethoxyindole-based dual chemosensor for the recognition of Fe3+ and Cu2+ ions
    (Elsevier Science Sa, 2019) Senkuytu, Elif; Bingul, Murat; Saglam, Mehmet F.; Kandemir, Hakan; Sengul, Ibrahim F.
    A novel N,N'N',1-tetraacetyl-4,6-dimethoxy-1H-indole-2-carbohydrazide 5, bearing four N-acetyl groups (N-COCH3) as cation binding sites was successfully synthesized by the reaction of readily available 4,6-dimethoxy-1H-indole-2-carbohydrazide 4 with acetic anhydride in dimethyl formamide in the presence of triethylamine. The structure of the acetyl indole 5 was confirmed using H-1 NMR, C-13 NMR, FT-IR, mass spectrometry and single crystal X-ray diffraction techniques. The colorimetric sensing ability of targeted compound 5 was investigated by monitoring UV-Vis and fluorescence spectroscopy spectral changes upon addition of different cations. The compound 5 demonstrated selective recognition toward the Fe+3 and Cu+2 ions over other cations examined such as Li+, Na+, K+ Mg2+, Ca2+, Ba2+, Mn2+, Fe2+, Cr3+, Co2+, Ni2+, Ag+, Cd2+, Al3+, Hg (+), Zn2+. The complex stoichiometry of the compound 5 and Cu2+/Fe3+ ions were determined as 2:1 (ligand/metal) by fluorescence titrations (Job's plot). This is the first report showing 4,6-dimethoxyindole moiety represents a dual chemosensor capable of detecting the Cu2+ and Fe2+ ions.
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    Öğe
    Synthesis, characterization, UV-Vis absorption and cholinesterase inhibition properties of bis-indolyl imine ligand systems
    (Elsevier, 2020) Saglam, Mehmet F.; Bingul, Murat; Senkuytu, Elif; Boga, Mehmet; Zorlu, Yunus; Kandemir, Hakan; Sengul, Ibrahim F.
    A number of bis-indolyl imine helical structures has successfully been synthesized employing Schiff base reaction conditions starting from 4,6-dimethoxy-2,3-diphenylindole with different o-phenyl diamines as pi-spacer bridged. The structures of targeted compounds were identified by FT-IR, mass, H-1 and C-13 NMR spectroscopy along with single crystal X-ray diffraction techniques. The ground state absorption properties of the bis-indolyl compounds were also investigated utilizing UV-Vis absorption spectroscopy. As the biological aspect of the synthesized compounds, the anticholinesterase potency was investigated towards the acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. The highest inhibition was determined in the presence of compound 9 with the values of 89.21 and 96.06, better than standard Galantamine, for AChE and BChE, respectively. (C) 2020 Elsevier B.V. All rights reserved.
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    Öğe
    Synthesis, photophysical and antioxidant properties of carbazole-based bis-thiosemicarbazones
    (Springer, 2019) Bingul, Murat; Senkuytu, Elif; Saglam, Mehmet F.; Boga, Mehmet; Kandemir, Hakan; Sengul, Ibrahim F.
    Utilizing Schiff base condensation of the 9-ethylcarbazole-3,6-dicarbaldehyde and thiosemicarbazides, four new N-ethylcarbazole-based bis-thiosemicarbazone compounds 4a-d were successfully synthesized in high yields. The photophysical properties of the targeted compounds 4a-d were investigated using UV-vis absorption and fluorescence emission spectroscopy. The antioxidant properties of targeted compounds 4a-d were determined by DPPH radical scavenging, ABTS Cation Radical Decolarization and CUPRAC Cupric Reducing Antioxidant Capacity assay methods. Moreover, the anti-cholinesterase properties of designated compounds were investigated by the Acetylcholinesterase (Ach) and Butyrylcholinesterase (BCh) enzyme inhibition assays. The compound 4a was determined as a valuable candidate to be a potent antioxidant agent for the DPPH and ABTS assays. The compound 4d was found to be a target compound for the kinetic measurements to identify the mechanism of action in the area of anticholinesterase activity assay.
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    Öğe
    Synthesis, photophysical and antioxidant properties of pyrrolo[3,2-c]carbazole and dipyrrolo[3,2-c:2,3-g]carbazole compounds
    (Springer, 2019) Bingul, Murat; Senkuytu, Elif; Boga, Mehmet; Uslu, Tugce Nur; Kandemir, Hakan; Sengul, Ibrahim F.
    The synthesis of (6-ethyl-1,6-dihydropyrrolo[3,2-c]carbazol-2-yl)methanol 5 and (6-ethyl-6,11-dihydro-1H-dipyrrolo[3,2-c:2,3-g]carbazole-2,10-diyl)dimethanol 6 were achieved via the reduction of methyl pyrrolo carbazole carboxylate 3 and methyl dipyrrolo carbazole carboxylate 4, respectively. The structures of hydroxymethyl-pyrrolocarbazoles 5 and 6 were supported by FT-IR, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, H-1 and C-13 NMR spectroscopy. The photophysical properties of the targeted compounds 3-6 were investigated by employing absorption and fluorescence spectroscopy in different common organic solvents. Also, the fluorescence lifetime ((F)) of the compounds was measured utilizing a time-correlated single-photon counting technique in tetrahydrofuran. Antioxidant activities of compounds 3-6 were determined by employing three different assays, namely DPPH radical scavenging, ABTS cation radical decolarization and cupric reducing antioxidant capacity. The results revealed that the ABTS cationic scavenging activity assay was found to be the most sensitive method for the determination of inhibition values.