catena-Poly[triethylammonium [[tetra-μ-acetato-κ8 O:O′-dicuprate(II)]-μ-acetato-κ2 O:O′] tetrahydrofuran monosolvate]

In the title compound, {[(C2H5)3NH][Cu2(CH3COO)5]·C4H8O}n, the two different CuII atoms are coordinated in a pseudo-square-pyramidal environment by five O atoms from the acetate ligands. Neighbouring pairs of CuII atoms are linked by four basally coordinating bridging acetate ligands as in the crystal structure of copper acetate monohydrate. The fifth, apically coordinating ligand links two of the dicopper tetraacetate paddlewheel-units together, thus building a linear coordination polymer which extends along [10-1]. Each apical acetate ligand is linked by an N—H⋯O hydrogen bond to a triethylammonium cation. Weak C—H⋯O hydrogen bonding interactions also occur.

In the title compound, {[(C 2 H 5 ) 3 NH][Cu 2 (CH 3 COO) 5 ]Á-C 4 H 8 O} n , the two different Cu II atoms are coordinated in a pseudo-square-pyramidal environment by five O atoms from the acetate ligands. Neighbouring pairs of Cu II atoms are linked by four basally coordinating bridging acetate ligands as in the crystal structure of copper acetate monohydrate. The fifth, apically coordinating ligand links two of the dicopper tetraacetate paddlewheel-units together, thus building a linear coordination polymer which extends along [101]. Each apical acetate ligand is linked by an N-HÁ Á ÁO hydrogen bond to a triethylammonium cation. Weak C-HÁ Á ÁO hydrogen bonding interactions also occur.

Related literature
For the crystal structure of dicoppertetraacetate dihydrate, see: van Niekerk & Schoening (1953);de Meester et al. (1973). For copper-based coordination polymers, see: Furukawa et al. (2008). The title compound was obtained as a minor byproduct in the synthesis of a copper-salene compound, see: Kleij et al. (2005).

Figure 1
Asymmertic unit of he title compound including the triethylammonium-cation and the co-crystallized THF-Molecule.
Thermal ellipsoids are drawn at 50% probability.

Figure 2
Two units of dicoppertetraacetate linked by a bridging acetato-ligand. The three hydrogen-bonds between the triethylammonium-cation and the acetato-ligand as well as the short intramolecular contact between H6c and O1 are shown as red dashed lines. The THF-molecule has been omitted for clarity.  Packing of the polymeric chains. The solvate-molecule, the cation and the hydrogen-atoms have been omitted for clarity.
No direct inter-chain contact could be observed.

catena-Poly[triethylammonium [[tetra-µ-acetato-κ 8 O:O′-dicuprate(II)]-µ-acetato-κ 2 O:O′] tetrahydrofuran monosolvate]
Crystal data (C 6   Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.