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Copper oxalate complexes: synthesis and structural characterisation

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.

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Correspondence to Kristína Matelková.

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Matelková, K., Kucková, L., Mašlejová, A. et al. Copper oxalate complexes: synthesis and structural characterisation. Chem. Pap. 70, 82–92 (2016). https://doi.org/10.1515/chempap-2015-0174

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Keywords

  • oxalate anion
  • carboxylate complexes
  • crystal structure
  • denticity
  • nitrogen ligands