Yazar "Gungor, Seyit Ali" seçeneğine göre listele

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    Benzaldehyde derivatives with functional propargyl groups as ?-glucosidase inhibitors
    (Elsevier, 2020) Gungor, Seyit Ali; Tumer, Mehmet; Kose, Muhammet; Erkan, Sultan
    The benzaldehyde derivatives (1-6) containing one and/or two propargyl arm(s) attached to the phenolic hydroxyl oxygen atom on the ortho-, meta- or para-positions of the aromatic ring were synthesized and characterized by spectral and microanalytical methods. The molecular structures were of 1, 4-6 determined by the single crystal X-ray crystallography. The benzaldehyde derivatives containing free phenolic groups involved intra- and inter-molecular hydrogen bonding interactions. The electrochemical properties of the compounds were investigated at the different scan rates and it was found that the compounds show different electrochemical behaviors. alpha-Glucosidase inhibitor properties of the carbonyl compounds were investigated and it has been determined that some of them show high activity. Compounds with a free phenolic group (-OH) exhibit better inhibition activity than compounds with no free phenolic group. It was also found that the position of propargyl group played an important role in the alpha-glucosidase inhibition activity. Molecular docking studies were performed to investigate the binding interactions and interaction energies of the (1-6) compounds with the alpha-glucosidase inhibitor. (C) 2020 Elsevier B.V. All rights reserved.
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    The new O, O and N, O type ligands and their Cu(II) and Ni(II) complexes: Crystal structure, absorption-emission properties and superoxide dismutase mimetic studies
    (ELSEVIER SCIENCE SA, 2017) Kose, Reyhane; Gungor, Seyit Ali; Kariper, Sultan Erkan; Kose, Muhammet; Kurtoglu, Mukerrem
    In this study, two new O, O type azo-aldehydes (HL1 and HL2), their N, O type salicylaldoxime derivatives containing azo chromophore group (HL3 and HL4) and Cu(II) and Ni(II) complexes were synthesized and characterized by elemental analysis, H-1-C-13 NMR, FT-IR, mass spectroscopies. Solid state structures of the HL3 and HL4 were also determined by single crystal X-ray diffraction method. Absorption and photoluminescence behaviours of the ligands and their metal complexes were investigated in DMF solution. Superoxide dismutase (SOD) activity of the Cu(II) and Ni(II) complexes were compared with the literature values. The K-cat values for SOD activity show that the complexes possess significant catalytic activity for the dismutation of superoxide compared to the data of some complexes and natural SOD enzymes given in the literature. The K-cat values for SOD activities of the complexes were found to be lower than natural enzymes. The complex [Cu(L-3)(2)] is the SOD mimic amongst the tested complexes with K-cat of 1.4 x 10(7) M-1 s(-1). (C) 2017 Elsevier B.V. All rights reserved.
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    Pamoic acid esters and their xanthene derivatives: Flourimetric detection of nitroaromatic compounds and non-linear optical properties
    (ELSEVIER SCIENCE SA, 2018) Gungor, Seyit Ali; Sahin, Irfan; Gungor, Ozge; Kariper, Sultan Erkan; Tumer, Ferhan; Kose, Muhammet
    In this study, four pamoic acid esters and a dibenzoxanthene derivative of pamoic acid ester were prepared and characterized by the analytical and spectroscopic methods Molecular structure of the synthesized compounds were determined by single crystal X-ray diffraction studies. Absorpsion and emission behaviours of the compounds were investigated in detail. Fluorescent detection of nitro aromatic compounds [nitro benzen (NB), 4-nitrophenol (4-NP) and 2,4-dinitrophenol(2,4-DNP)] by the synthesized compounds was examined. Sensing cabability to NACs, fluorescent titration experiments were performed and compound (2) exhibit the highest sensitivity against NB with a quenching constant (Ksv) of 1.03 x 10(7) M-1. Finally, non-linear optic properties of the compounds was investiagated by computational (C) 2017 Elsevier B.V. All rights reserved.