Yazar "Dutkiewicz, Grzegorz" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim Yok
    Öğe
    Establishing Composition of Solid Solution Based on Single Crystal and Powder X-ray Measurement: The Case of Halogenated Bismuth(III) Complexes with Acetophenone-4-methyl-3-thiosemicarbazone
    (Mdpi, 2024) Grzeskiewicz, Anita M.; Dutkiewicz, Grzegorz; Ozturk, Ibrahim I.; Kubicki, Maciej
    New bismuth (III) complexes with acetophenone-4-methyl-3-thiosemicarbazone (L) and halogens (Cl and Br) in both bridging and terminal positions have been synthesized and structurally characterized using single-crystal X-ray diffraction. The pure complexes (Cl or Br) were found to be highly isostructural, which motivated our attempts to create solid solutions of these complexes. A series of such compounds was prepared using various procedures and stoichiometries. A method for determining the mutual concentrations of different halogens, based on the positions of selected peaks in powder diffraction patterns, was tested and compared with other methods.
  • Küçük Resim Yok
    Öğe
    Group VA Aromatic Thiosemicarbazone Complexes: Synthesis, Characterization, Biological Activity, and Topological Studies
    (Mdpi, 2024) Ozturk, Ibrahim I.; Sumer, Emine I.; Dutkiewicz, Grzegorz; Banti, Christina N.; Hadjikakou, Sotiris K.; Grzeskiewicz, Anita M.; Kubicki, Maciej
    The antiproliferative and antibacterial activities of thiosemicarbazones increase markedly with the presence of metal ions. One of the factors determining the activity of metal thiosemicarbazone complexes is the coordination structure. In this study, the biological effects of new antimony (III) and bismuth (III) thiosemicarbazone complexes with different binding modes and geometrical structures were demonstrated. Three new complexes, with the formulae {[SbCl3(mu 2-S-Hacptsc)(eta 1-S-Hacptsc)], 2/3H2O,1/3CH2Cl2}, {[SbCl3(kappa 2-S,N-Hacpmtsc)(eta 1-S-Hacpmtsc)2CH2Cl2]}, and{[BiCl3(eta 1-S-Hbzmtsc)3]C2H5OH}, where Hacptsc: acetophenone thiosemicarbazone, Hacpmtsc: acetophenone-N-methyl thiosemicarbazone, Hbzmtsc: benzaldehyde-N-methyl thiosemicarbazone) were elucidated by different methods and deeply analyzed in accordance with their structure by X-ray structure analysis and Atoms-In-Molecules topological analysis. This analysis provided a deeper understanding of the coordination spheres of the Sb/Bi complexes. For instance, the first reported two binding modes of the same ligand are observed in a single crystal structure of antimony (III) halide complexes. Additionally, in one of the complexes, a solid-to-solid phase transition was detected and analyzed in detail. Those complexes, very unique in terms of their geometry, have also been tested for their in vitro cytotoxic activity against human adenocarcinoma cervical cancer (HeLa) cells, whereas antimony (III) complex 1is the most active complex of this study. Further, the antibacterial activity of the complexes has been screened against two Gram-negative (Pseudomonas aeruginosa and Escherichia coli) and two Gram-positive (Staphylococcus epidermidis and Staphylococcus aureus) pathogenic bacteria. From the results, it is found that all the complexes exhibited significant activity against the Gram-negative pathogenic bacteria.
  • Küçük Resim Yok
    Öğe
    Solid-to-solid phase transitions in two isostructural Bi(III) complexes and their solid solution.
    (Int Union Crystallography, 2024) Grzeskiewicz, Anita M.; Dutkiewicz, Grzegorz; Aygun, Ozlem; Ozturk, Ibrahim I.; Kubicki, Maciej
    [No abstract available]
  • Küçük Resim Yok
    Öğe
    Solid-to-solid polymorphic phase transitions in two isostructural Bi(III) complexes with 1-phenylethyl-N-ethylthiosemicarbazide and halogens
    (Nature Portfolio, 2023) Grzeskiewicz, Anita M.; Dutkiewicz, Grzegorz; Aygun, Ozlem; Ozturk, Ibrahim I.; Kubicki, Maciej
    Two isostructural (in room temperature) complexes of Bi(III) with halogens and sulfur ligands have been investigated in terms of the solid-to-solid phase transitions indicated by temperature. Both chloride and bromide (X) complexes of the general formula (& mu;(2)-X)-(BiX2L2)(2) exhibit some phase transitions between 100 and 333 K, which, apart from the numerous similarities, show significant differences, which have been noted and analyzed in detail in this paper by using different techniques, i.e., powder and single crystal diffraction or DSC. The obtained results have also been collated with those obtained for solid solutions of both complexes.