Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 12 (December 2003)

Acta Cryst. (2003). C59, m505-m508    [doi:10.1107/S0108270103023175]

Group 2 metal salts of pyromellitic acid: [Mg(H₂O)₆](C₁₀H₄O₈) and [Ba(C₁₀H₄O₈)(H₂O)₅]

S. H. Dale, M. R. J. Elsegood and S. Kainth

Abstract: Structural determinations of the magnesium(II) and barium(II) salts of pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid) are presented. Hexaaquamagnesium(II) benzene-1,2,4,5-tetracarboxylate(2-), [Mg(H₂O)₆](C₁₀H₄O₈), (I), and pentaaqua[benzene-1,2,4,5-tetracarboxylato(2-)]barium(II), [Ba(C₁₀H₄O₈)(H₂O)₅], (II), are both centrosymmetric and both possess a 1:1 metal-ligand ratio, but the two structures are found to differ in that the magnesium salt contains a hexaaqua cation and possesses only hydrogen-bonding interactions between cations and anions, while the barium salt exhibits coordination of the carboxylate ligand to the nine-coordinate metal centre. In (I), both ions sit on a 2/m site symmetry, and in (II), the cation and anion are located on m and i site symmetries, respectively.

Formula: [Mg(H₂O)₆](C₁₀H₄O₈) and [Ba(C₁₀H₄O₈)(H₂O)₅]

Online 8 November 2003

	Structure factor file (CIF format) (34.9 kbytes) Contains datablock I
	Structure factor file (CIF format) (93.0 kbytes) Contains datablock II

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