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Copper oxalate complexes: synthesis and structural characterisation

Kristína Matelková, Lenka Kucková, Anna Mašlejová, Ján Moncoľ, Vladimír Jorík, and Jozef Kožíšek

Institute of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, SK-812 37 Bratislava, Slovakia



Abstract: Six copper(II) oxalate complexes, namely {K2[Cu(ox)2]}n (1), {(Hiz)2[Cu(ox)2]}n (2), {[Cu(ox) (N-Bzliz)2]}n (3), (HMeiz)2[Cu(ox)2] (4), {[Cu(ox)(Meiz)2]}n (5), and [Cu(Hox)2(H2O)2](N-Bzliz) (6) where ox = oxalate ion, iz = imidazole, N-Bzliz = N-benzylimidazole, Meiz = 2-methylimidazole, were synthesised and characterised by single crystal X-ray diffraction (complexes 1-5) or powder X-ray diffraction (compound 6). The three-dimensional crystal packing structures of 2, 4, and 5 are consolidated by intermolecular hydrogen bonds linking the oxygen atom of the oxalate group and the amine or imine group of the imidazole-based part into chains. The molecules of complex 6 are held together by intermolecular hydrogen bonds between the oxygen atoms of the oxalate group and coordinated water molecules.

Keywords: oxalate anion – carboxylate complexes – crystal structure – denticity – nitrogen ligands

Full paper is available at

DOI: 10.1515/chempap-2015-0174


Chemical Papers 70 (1) 82–92 (2016)

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