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Different structural types of copper(II) furan- and thiophencarboxylates: X-ray structural, EPR, spectral and magnetic analyses

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Abstract

Synthesis and characterization of eight new complexes of various structural types are reported. With 5-nitro-2-furancarboxylic acid (5-NO2-2-fucH), two monomeric complexes, [Cu(5-NO2-2-fuc)2(H2O)2] (II) and [Cu(5-NO2-2-fuc)2(H2O)4] (III), as well as a dimeric complex with ethylnicotinate (Etnic), [Cu(5-NO2-2-fuc)2(Etnic)2]2 (V), were prepared. With other acids: 2,5-dimethyl-3-furancarboxylic acid (2,5-Me2-3-fucH), 2-thiophencarboxylic acid (2-tpcH), 3-methyl-2-thiophencarboxylic acid (3-Me-2-tpcH) or 5-methyl-2-thiophencarboxylic acid (5-Me-2-tpcH), only dimeric complexes [Cu(2,5-Me2-3-fuc)2(H2O)]2 (I), [Cu(2,5-Me2-3-fuc)2(Etnic)]2 (IV), [Cu(2-tpc)2(Etnic)]2 (VI), [Cu(3-Me-2-tpc)2(Etnic)]2 (VII) and Cu(5-Me-2-tpc)2(Etnic)]2 (VIII) have been synthesised. Characterizations of the complexes were based on elemental analysis and infrared, electronic, EPR and magnetic measurements. Moreover, complexes III, V, VII and VIII were also studied by X-ray structural analysis. Two structural types of dimeric complexes were observed differing in the number of carboxylate bridges. Most of the dinuclear complexes exhibit the common “paddle-wheel” structural motif while the molecular structure of V contains two pentacoordinated copper(II) ions bridged by two carboxylate groups of two 5-nitro-2-furancarboxylate ligands resulting in the intramolecular copper-copper distance of 4.4960(8) Å. Magnetic properties (monomeric EPR signal and isotropic exhchange constant (J of approximately 0 cm−1) of V confirmed a very weak magnetic interaction between copper centres.

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  1. Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak Technical University in Bratislava, 81237, Bratislava, Slovakia

    Petra Bertová, Vladimír Kuchtanin, Ján Moncoľ, Jozef Švorec & Peter Segľa

  2. Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, 532 10, Pardubice, Czech Republic

    Zdeňka Růžičková

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  1. Petra Bertová
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  2. Vladimír Kuchtanin
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  3. Zdeňka Růžičková
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Bertová, P., Kuchtanin, V., Růžičková, Z. et al. Different structural types of copper(II) furan- and thiophencarboxylates: X-ray structural, EPR, spectral and magnetic analyses. Chem. Pap. 70, 114–125 (2016). https://doi.org/10.1515/chempap-2015-0204

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