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

  • Petra Bertová EMAIL logo , Vladimír Kuchtanin , Zdeňka Růžičková , Ján Moncoľ , Jozef Švorec and Peter Segľa
Published/Copyright: January 22, 2016
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Chemical Papers
From the journal Chemical Papers Volume 70 Issue 1

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.

Keywords: copper(II) compexes; furancarboxylate; thiophencarboxylate; ethylnicotinate; EPR of copper(II)

‡Presented at the XXV. International Conference on Coordination and Bioinorganic Chemistry, Smolenice, Slovakia, 31 May–5 June 2015.

Acknowledgements

Slovak grant agencies VEGA (VEGA 1/0472/13, 1/0765/14) and APVV (APVV-14-0078) are acknowledged for financial support.

Supplementary data

CCDC 1051802 and 1051804–1051806 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, IK; dax: (+44) 1223-336-033; or e-mail: .

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Received: 2015-5-12
Revised: 2015-9-6
Accepted: 2015-9-9
Published Online: 2016-1-22
Published in Print: 2016-1-1

© 2015 Institute of Chemistry, Slovak Academy of Sciences

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https://doi.org/10.1515/chempap-2015-0204
Keywords for this article
copper(II) compexes; furancarboxylate; thiophencarboxylate; ethylnicotinate; EPR of copper(II)

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