Acta Cryst. (2007). E63, m1834-m1836  [ doi:10.1107/S1600536807027092 ]

Poly[bis(₃-dihydrogen malonato)calcium(II)]

K. Aliouane, N. Rahahlia, A. Guehria-Laidoudi, S. Dahaoui and C. Lecomte

Abstract: The title compound, [Ca(C₃H₃O₄)₂]_n, has a polymeric structure, built up from noncentrosymmetric Ca₂O₁₂ face-sharing bipolyhedra, linked through the spacers of the ligands and forming a complex three-dimensional framework containing empty channels parallel to the [001] direction. The calcium ion lies on a 2 axis and is coordinated by eight O atoms from six hydrogen malonate ligands in a distorted bicapped dodecahedron. The tridentate ligand displays an ⁵-chelating coordination mode and forms both _1,1 and _1,3 bridges. In the extended network, the protonated O atom is involved in a strong hydrogen bond with a deprotonated O atom, forming an infinite array of the ligands. An M-O-M infinite linkage characteristic of metal-organic frameworks is prevented here by cage assembly around the metal.

Online 8 June 2007

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