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Author: search.filters.author.Kravtsov, VictorHas files: Yes

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    SINTEZA ȘI CARACTERIZAREA CARBOXILAȚILOR HEPTANUCLEARI AI FIERULUI(III) PE BAZĂ DE DERIVAȚI AI DIETANOLAMINEI
    (CEP USM, 2024) Podgornîi, Daniel; Kravtsov, Victor; Baca, Svetlana
    This study focuses on the synthesis and characterization of heptanuclear iron(III) compo unds featuring polyalcoholamine ligands. Ultrasonic treatment of small trinuclear or hexanucle ar pivalate clusters and diethanolamine derivatives (R-deaH2 , R = CH3 (1); CH3 C6 H4 (2)) resul ted in two heptanuclear iron(III) clusters with general formula [Fe7 O2 (piv)9 (R-dea)3 (H2 O)3 ]. A single-crystal X-ray diffraction analysis shows that clusters 1 and 2 have a disk-like {Fe7 O3 } core in which the central FeIII atom linked to FeIII 6 hexagon by three µ3 -O2− groups. Six pivalates and three polyalcoholamine ligands additionally bridge all FeIII atoms. The remaining pivalates and three water molecules completed the coordination sphere of metal atoms. In summary, this study showcases the synthesis and characterization of heptanuclear iron(III) compounds with amine alcohol ligands, offering a deeper understanding of their structural properties, with promising implications for the field of coordination chemistry and advanced materials science.
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    CRYSTAL STRUCTURE AND NMR SPECTROSCOPIC CHARACTERIZATION OF 1,5-BIS(2-HYDROXY-3- METHOXYBENZYLIDENE)CARBONOHYDRAZIDE
    (2023) Talmaci, Natalia; Dragancea, Diana; Gorincioi, Elena; Bourosh, Pavlina; Kravtsov, Victor
    The solid-state structure of a symmetrical carbohydrazone, namely 1,5-bis(2-hydroxy-3- methoxybenzylidene)carbonohydrazide was determined by X-ray single crystal diffraction method. Compound 1 crystallizes in the monoclinic space group P21/n with unit cell parameters a= 10.1198(6), b= 22.7847(11), c= 15.1738(10) Å, β= 100.458(6)°, Z= 4, V= 3440.6(3) Å3, R1= 0.0540. Crystal structure of 1 is defined by two crystallographic independent molecules, which are bonded via N–H···O hydrogen bond. The organic molecules are as keto tautomers with respect to the carbamide fragment, and adopt the anti conformation. 1D and 2D NMR experiments have argued on the presence of the title compound in DMSO-d6 solution mostly as keto tautomer in syn conformation, and enol-imino form when considering o-vanillin residue.