Acta Cryst. (2007). E63, m1859-m1860  [ doi:10.1107/S1600536807027808 ]

Bis(ethylenediammonium) dichromate oxalate

R. Ben Smail, H. Chebbi and A. Driss

Abstract: The structure of the title compound, [NH₃(CH₂)₂NH₃]₂[Cr₂O₇](C₂O₄), consists of inorganic columns of dichromate anions running along the c axis and organic layers of formula {[(C₂H₁₀N₂)₂·C₂O₄]_n}²ⁿ⁺ parallel to the (100) plane. The dichromate anion lies on a crystallographic twofold rotation axis and the oxalate anion on a centre of symmetry. Three of the four crystallographically independent O atoms of the dichromate anion are disordered, two over two sites and one over three sites; the site occupancy factors are approximately 0.65:0.35, 0.7:0.3 and 0.4:0.3:0.3. Structural cohesion is ensured by N-HO hydrogen-bonding interactions, which form a three-dimensional framework.

Online 13 June 2007

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