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A new polymorph of magnesium oxalate dihydrate.

ABSTRACT: In the asymmetric unit of the title compound, catena-poly[[diaqua-magnesium(II)]-?-oxalato], [Mg(C(2)O(4))(H(2)O)(2)](n), there is one Mg atom in an octa-hedral coordination with site symmetry 222, a unique C atom of the oxalate anion lying on a twofold axis, an O atom of the anion in a general position and a water O atom at a site with imposed twofold rotation symmetry. The Mg(2+) ions are ligated by water mol-ecules and bridged by the anions to form chains that are held together by O-H?O hydrogen bonds. The structure of the title compound has already been reported in a different space group [Lagier, Pezerat & Dubernat (1969 ?). Rev. Chim. Miner.6, 1081-1093; Levy, Perrotey & Visser (1971 ?). Bull. Soc. Chim. Fr. pp. 757-761].

SUBMITTER: Chen XA 

PROVIDER: S-EPMC2961852 | biostudies-other | 2008

REPOSITORIES: biostudies-other

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A new polymorph of magnesium oxalate dihydrate.

Chen Xue-An XA   Song Fang-Ping FP   Chang Xin-An XA   Zang He-Gui HG   Xiao Wei-Qiang WQ  

Acta crystallographica. Section E, Structure reports online 20080607 Pt 7

In the asymmetric unit of the title compound, catena-poly[[diaqua-magnesium(II)]-μ-oxalato], [Mg(C(2)O(4))(H(2)O)(2)](n), there is one Mg atom in an octa-hedral coordination with site symmetry 222, a unique C atom of the oxalate anion lying on a twofold axis, an O atom of the anion in a general position and a water O atom at a site with imposed twofold rotation symmetry. The Mg(2+) ions are ligated by water mol-ecules and bridged by the anions to form chains that are held together by O-H⋯O hydro  ...[more]