2. Articole
Permanent URI for this collectionhttps://msuir.usm.md/handle/123456789/13434
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Item SINTEZA ȘI CARACTERIZAREA STRUCTURALĂ A COMPLEXULUI HETEROMETALIC {Co2 La2 } IZOBUTIRAT ÎN BAZA N-BUTILDIETANOLAMINEI(CEP USM, 2024) Stati, Dumitru; Kravțov, Victor; Baca, SvetlanaA new heterometalic [Co2 La2 (OH)2 (ib)4 (bdea)2 (NO3 )2 ]∙2MeCN (1) cluster has been syn thesized by the reaction of Co(II) isobutyrate (Hib = isobutyric acid) and La(NO3 )3 ∙ 6H2 O with N-butyldiethanolamine (H2 bdea) in acetonitrile. Single-crystal X-ray structural analysis reveals that 1 crystallizes with two acetonitrile molecules in the P21 /n space group of the monoclinic system with a = 14.769(5), b = 9.416(3), c = 19.538(6) Å, β=100.315(3)° and V = 2673.11(15) Å3 . Cluster 1 has a rhombic planar tetranuclear central core {Co(III)2 La(III)2 } best described as a „butterfly” motif with the La(III) ions ocupied the „body” positions and the Co(III) ions at the „wing” sites.Item SINTEZA ȘI CARACTERIZAREA CARBOXILAȚILOR HEPTANUCLEARI AI FIERULUI(III) PE BAZĂ DE DERIVAȚI AI DIETANOLAMINEI(CEP USM, 2024) Podgornîi, Daniel; Kravtsov, Victor; Baca, SvetlanaThis 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.Item ANALIZA SUPRAFEȚEI HIRSHFELD ALE INTERACȚIUNILOR INTERMOLECULARE ÎN CO-CRISTALE DE [Co(NH3)6]3+ ȘI ACID 3-SULFOBENZOIC(CEP USM, 2024) Beleaev, Ecaterina; Kravțov, Victor; Baca, SvetlanaHydrogen bonding has been shown to be predominant among the interaction types for systems involving the [Co(nH3)6]3+cation and various anions/molecules. This study examines the role of intermolecular bonds and their quantitative and qualitative investigation between 3-sulfobenzoic acid (3-sbH2) and the cobalt(III) hexaamine complex cation in molecular crystals. Two new multi-component compounds [Co(nH3)6]Cl(3-sb)·H2O (1) and [Co(nH3)6]2Cl2(3-sb) (sO4)·7H2O (2) were synthesized and characterized. The single crystal X-ray diffraction study reveals that in these compounds the complex cation [Co(nH3)6]3+ serves as a basic element for the incorporation of various anions/molecules and promotes the formation of multi-component compounds with extended networks via H-bonds. The analysis of the Hirshfeld surfaces allowed the quantitative and qualitative identifcation of the main contacts involved in the molecular packing of the crystals.Item POLIMER COORDINATIV UNI-DIMENSIONAL DE Cu(II) ÎN BAZA ACIDULUI IZOBUTIRIC ȘI PIRAZINĂ: SINTEZA ȘI STRUCTURA(CEP USM, 2024) Capbătut, Olga; Kravțov, Victor; Baca, SvetlanaCoordination polymers are playing an increasingly important role in the feld of inorganic chemistry. Of particular interest is the use of Cu(II) carboxylates to assemble new compounds involving various bridging ligands for the formation of coordination polymers. a new [Cu(is)2(pyz)] n coordination compound has been synthesized by the reaction of Co(II) isobutyrate with pyrazine (pyz) ligand in acetonitrile. a single-crystal X-ray diffraction analysis shows that the pepared compound is a one-dimensional coordination polymer in which the [Cu(is)2] units are connected by pyrazine ligands into chains.