Browsing by Author "Berzenina, Oksana V."

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Crystal Structure of the Mixed-Ligand Complex of Co(II) with Succinic Acid and Pyridine
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Trunova, O. K.; Zheleznova, L. I.; Dyakonenko, V. V.; Sliusarchuk, L. I.; Shtokvysh, O. I.; Berzenina, Oksana V.
ENG: A new mixed-ligand complex {[CoCHO)⋅2Ðó]⋅2H2O}n was synthesized via the interaction of equimolar amounts of cobalt nitrate and sodium succinate in the presence of pyridine at pH 5.5–6.0. The complex was investigated by X-ray structure analysis, elemental analysis, UV/VIS and IR spectroscopies, and differential thermal analysis. The complex is a one-dimensional coordination polymer and crystallizes in the orthorhombic space group Pbca with unit cell parameters a=11.8945 Å , b=8.9064 Å , c=15.1116 Å , α=β=γ=90 Celsius degrees. The atom of cobalt has a slightly distorted octahedral N2O4 environment and forms Co–N bonds with two molecules of pyridine and Co–O bonds with the carboxyl groups of two symmetric succinic acid molecules. The coordination number Co(II) is supplemented up to 6 by two water molecules, which are located in the axial plane of the coordination polyhedron. Due to the monodentate coordination of two symmetrically independent carboxylate oxygen atoms of one succinic acid molecule, one-dimensional coordination polymer chains are formed. Polymer chains in the crystal are united by intermolecular hydrogen bonds, which leads to the formation of layers packed in the crystal parallel to the (001) plane. Hirschfeld surface analysis and two- dimensional fingerprint plots were used to analyze the intermolecular interactions present in the crystal.
Gold Nanoparticles Stabilized With Aminopolycarboxylic Acids
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Тrunova, O. K.; Berezhnytska, O. S.; Rohovtsov, O. O.; Berzenina, Oksana V.; Khrokalo, L. A.; Semenets, Yu.V.
ENG: This study presents the synthesis, morphological characterization, and preliminary antimicrobial evaluation of novel colloidal gold nanoparticle (AuNP) systems stabilized with aminopolycarboxylic acids: ethylenediaminetetraacetic acid (EDTA) and ethylenediaminedisuccinic acid (EDDS). These complexing agents act not only as chelators but also as simultaneous reducing and stabilizing agents in the formation of AuNPs, offering a green and environmentally friendly approach to nanomaterial fabrication. The synthesis was carried out under mild aqueous conditions without external protective additives, enabling the production of stable colloidal systems with minimal side products. The resulting nanoparticles were characterized by UV-Vis spectroscopy, FTIR spectroscopy, and scanning electron microscopy (SEM). Characteristic surface plasmon resonance (SPR) bands were observed in the 530–550 nm range, with their intensity and spectral position sensitive to pH, ligand nature, and stabilization time. The most stable and monodisperse systems were obtained at pH≈9, with spherical nanoparticles ranging in size from 8 to 20 nm. Particular emphasis was placed on evaluating the biological activity of the synthesized dispersions. Antimicrobial screening was performed against Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli) bacterial strains. The results demonstrated moderate to high bactericidal activity, especially in EDTA-stabilized samples, likely due to enhanced surface stabilization and potential ligand involvement in membrane interactions.