Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 5 (May 2007)

metal-organic compounds

ln3043 scheme

Acta Cryst. (2007). C63, m207-m215 [ doi:10.1107/S010827010701459X ]

Cationic, neutral and anionic metal(II) complexes derived from 4-oxo-4H-pyran-2,6-dicarboxylic acid (chelidonic acid)

V. Yasodha, S. Govindarajan, J. N. Low and C. Glidewell

Abstract: The structures of five metal complexes containing the 4-oxo-4H-pyran-2,6-dicarboxylate dianion illustrate the remarkable coordinating versatility of this ligand and the great structural diversity of its complexes. In tetraaquaberyllium 4-oxo-4H-pyran-2,6-dicarboxylate, [Be(H₂O)₄](C₇H₂O₆), (I), the ions are linked by eight independent O-HO hydrogen bonds to form a three-dimensional hydrogen-bonded framework structure. Each of the ions in hydrazinium(2+) diaqua(4-oxo-4H-pyran-2,6-dicarboxylato)calcate, (N₂H₆)[Ca(C₇H₂O₆)₂(H₂O)₂], (II), lies on a twofold rotation axis in the space group P2/c; the anions form hydrogen-bonded sheets which are linked into a three-dimensional framework by the cations. In bis( [mu] -4-oxo-4H-pyran-2,6-dicarboxylato)bis[tetraaquamanganese(II)] tetrahydrate, [Mn₂(C₇H₂O₆)₂(H₂O)₈]·4H₂O, (III), the metal ions and the organic ligands form a cyclic centrosymmetric Mn₂(C₇H₂O₆)₂ unit, and these units are linked into a complex three-dimensional framework structure containing 12 independent O-HO hydrogen bonds. There are two independent Cu^II ions in tetraaqua(4-oxo-4H-pyran-2,6-dicarboxylato)copper(II), [Cu(C₇H₂O₆)(H₂O)₄], (IV), and both lie on centres of inversion in the space group P $\overline{1}$ ; the metal ions and the organic ligands form a one-dimensional coordination polymer, and the polymer chains are linked into a three-dimensional framework containing eight independent O-HO hydrogen bonds. Diaqua(4-oxo-4H-pyran-2,6-dicarboxylato)cadmium monohydrate, [Cd(C₇H₂O₆)(H₂O)₂]·H₂O, (V), forms a three-dimensional coordination polymer in which the organic ligand is coordinated to four different Cd sites, and this polymer is interwoven with a complex three-dimensional framework built from O-HO hydrogen bonds.

Formula: [Be(H₂O)₄](C₇H₂O₆), (N₂H₆)[Ca(C₇H₂O₆)₂(H₂O)₂], [Mn₂(C₇H₂O₆)₂(H₂O)₈]·4H₂O, [Cu(C₇H₂O₆)(H₂O)₄] and [Cd(C₇H₂O₆)(H₂O)₂]·H₂O


	Structure factor file (CIF format) (123.0 kbytes) [ doi:10.1107/S010827010701459X/ln3043Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (96.1 kbytes) [ doi:10.1107/S010827010701459X/ln3043IIsup3.hkl ] Contains datablock II

	Structure factor file (CIF format) (143.0 kbytes) [ doi:10.1107/S010827010701459X/ln3043IIIsup4.hkl ] Contains datablock III

	Structure factor file (CIF format) (111.3 kbytes) [ doi:10.1107/S010827010701459X/ln3043IVsup5.hkl ] Contains datablock IV

	Structure factor file (CIF format) (103.7 kbytes) [ doi:10.1107/S010827010701459X/ln3043Vsup6.hkl ] Contains datablock V

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