Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 6 (June 2007)

metal-organic compounds

 

Two pseudo-polymorphic copper-benzene-1,2,4,5-tetracarboxylate complexes

J.-H. Luo, C.-C. Huang, X.-H. Huang and X.-J. Chen

Abstract: Two pseudo-polymorphic polymers, poly[ethylenediammonium [[aquacopper(II)]-₄-benzene-1,2,4,5-tetracarboxylato] dihydrate], {(C₂H₁₀N₂)[Cu(C₁₀H₂O₈)(H₂O)]·2H₂O}_n, (I), and poly[ethylenediammonium [copper(II)-₄-benzene-1,2,4,5-tetracarboxylato] 2.5-hydrate], {(C₂H₁₀N₂)[Cu(C₁₀H₂O₈)]·2.5H₂O}_n, (II), contain two-dimensional anionic layers, ethylenediammonium (H₂en) cations acting as counter-ions and free water molecules. Although the topological structures of the two anionic layers are homologous, the coordination environments of the Cu^II centres are different. In (I), the Cu^II centre, sitting on a general position, has a square-pyramidal environment. The two independent benzene-1,2,4,5-tetracarboxylate (btc) anions rest on centres of inversion. The Cu^II cation in (II) is located on a twofold axis in a square-planar coordination. The H₂en cation is on an inversion centre and the btc ligand is split by a mirror plane. Extensive hydrogen-bonding interactions between the complexes, H₂en cations and water molecules lead to the formation of three-dimensional supramolecular structures.

Formula: (C₂H₁₀N₂)[Cu(C₁₀H₂O₈)(H₂O)]·2H₂O and (C₂H₁₀N₂)[Cu(C₁₀H₂O₈)]·2.5H₂O

	Structure factor file (CIF format) (179.0 kbytes) [ doi:10.1107/S0108270107019853/sq3073Isup2.hkl ] Contains datablock I
	Structure factor file (CIF format) (92.1 kbytes) [ doi:10.1107/S0108270107019853/sq3073IIsup3.hkl ] Contains datablock II

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