Acta Cryst. (2009). E65, m1419-m1420  [ doi:10.1107/S160053680904269X ]

Poly[(₅-5-carboxylatotetrahydrofuran-2,3,4-tricarboxylic acid)sodium]

J. Xu, W. Chai, J. Lin, H. Shi and K. Shu

Abstract: The search for the novel metal-organic frameworks (MOFs) materials using tetrahydrofuran-2,3,4,5-tetracarboxylic acid (THFTCA) as a versatile multi-carboxyl ligand, lead to the synthesis and the structure determination of the title compound, [Na(H₃THFTCA)] or [Na(C₈H₇O₉)]_n, which was obtained by a solution reaction at room temperature. The ligand is mono-deprotonated, coordinating five sodium ions through one furan oxygen atom and six carboxyl oxygen atoms. The sodium ion exhibits a distorted pentagonal-bipyramidal NaO₇ geometry consisting of seven O atoms derived from five surrounding ligands. Two adjacent pentagonal bipyramids share an O-O edge, forming a dinuclear sodium cluster. Finally, these clusters are effectively linked by the carboxyl groups of THFTCA ligands, forming a firm metal organic framework and O-HO hydrogen bonds contribute to the crystal packing.

Online 23 October 2009

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