Acta Cryst. (2012). E68, o2807
[ doi:10.1107/S1600536812036501 ]

Hexakis(propylammonium) benzene-1,2,4,5-tetracarboxylate 2,5-dicarboxybenzene-1,4-carboxylate tetrahydrate

S. Khorasani and M. A. Fernandes

Abstract: The title organic salt, 6C₃H₁₀N⁺·C₁₀H₂O₈^4-·C₁₀H₄O₈^2-·4H₂O, contains seven independent entities in the asymmetric unit which comprises three propylammonium cations, two water molecules, half a 2,5-dicarboxybenzene-1,4-carboxylate dianion (H₂btc^2-) and half a benzene-1,2,4,5-tetracarboxylate tetraanion (btc^4-), the latter two anions being located about centres of inversion. One of the water molecules is disordered over two positions in a 0.55 (2):0.45 (2) ratio. The combination of molecular ions and water molecules results in an extensive and complex three-dimensional network of hydrogen bonds, the network being made up of nine unique N-HO interactions between the ammonium cations and the anions, as well as four unique O-HO interactions between the water molecules and the anions.

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