Acta Crystallographica Section C

Crystal Structure Communications

Volume 65, Part 1 (January 2009)

metal-organic compounds

Acta Cryst. (2009). C65, m24-m27 [ doi:10.1107/S0108270108041541 ]

Two isomorphous cobalt(II) complexes: poly[[diaqua--2,5-dicarboxybenzene-1,4-dicarboxylato--1,2-di-4-pyridylethene-cobalt(II)] 1,2-di-4-pyridylethene solvate] and the 1,2-di-4-pyridylethane analogue

A. M. Atria, G. Corsini, A. Talamilla, M. T. Garland and R. Baggio

Abstract: The two isomorphous title structures, formulated as {[Co(C₁₀H₄O₈)(C₁₂H₁₀N₂)(H₂O)₂]·C₁₂H₁₀N₂}_n, (I), and {[Co(C₁₀H₄O₈)(C₁₂H₁₂N₂)(H₂O)₂]·C₁₂H₁₂N₂}_n, (II), respectively, are reported. They crystallize in the space group P $\overline{1}$ with only one formula unit in the asymmetric unit, so that the organic ligands lie about inversion centres and the Co atom lies on an inversion centre. The Co atoms are octahedrally coordinated by a carboxylate O atom from 2,5-dicarboxybenzene-1,4-dicarboxylate (H₂btc), one N atom from 1,2-di-4-pyridylethene (L) in (I) or from 1,2-di-4-pyridylethane (L) in (II), and one coordinated water molecule, plus their inversion-related species. This particular coordination results in a two-dimensional array, with an elemental unit in the shape of a parallelogram having the Co^II cations at the corners, linked in one direction by L bridges and in the opposite direction by H₂btc groups. The L solvent molecules act as pillars between parallel planes, linking them by strong hydrogen bonds where the H atoms lie midway between the formal donor/acceptor atoms in a `shared' mode. Comparison is made with structures presenting the same structural motif, strongly suggesting that the two-dimensional arrangement reported here might be a very stable robust building block for molecular engineering purposes.

Formula: [Co(C₁₀H₄O₈)(C₁₂H₁₀N₂)(H₂O)₂]·C₁₂H₁₀N₂ and [Co(C₁₀H₄O₈)(C₁₂H₁₂N₂)(H₂O)₂]·C₁₂H₁₂N₂


	Structure factor file (CIF format) (163.3 kbytes) [ doi:10.1107/S0108270108041541/fg3070Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (168.8 kbytes) [ doi:10.1107/S0108270108041541/fg3070IIsup3.hkl ] Contains datablock II

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