Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 2 (February 2005)

organic compounds

sk1802 scheme

Acta Cryst. (2005). C61, o118-o121 [doi:10.1107/S0108270104034055]

Piperazine-2,5-dione-oxalic acid-water (1/1/2) and a redetermination of piperazine-2,5-dione, both at 120 K: hydrogen-bonded sheets containing multiple ring types

T. R. Sarangarajan, K. Panchanatheswaran, J. N. Low and C. Glidewell

Abstract: In piperazine-2,5-dione-oxalic acid-water (1/1/2), C₄H₆N₂O₂·C₂H₂O₄·2H₂O, both organic components lie across inversion centres in space group $P\overline{1}$ . The molecules are linked by N-HO and by both two-centre O-HO and three-centre O-H(O)₂ hydrogen bonds into sheets built from $R_{1}^{2}$ (5), $R_{2}^{2}$ (8), $R_{4}^{4}$ (8) and $R_{5}^{4}$ (15) rings. In piperazine-2,5-dione, C₄H₆N₂O₂, where the molecules lie across centres of inversion in space group P2₁/c, the molecules are linked by paired N-HO hydrogen bonds into ribbons of centrosymmetric $R_{2}^{2}$ (8) rings, which are further linked into sheets by C-HO hydrogen bonds, generating $R_{4}^{3}$ (14) rings between the ribbons.

Formula: C₄H₆N₂O₂·C₂H₂O₄·2H₂O and C₄H₆N₂O₂


	Structure factor file (CIF format) (56.5 kbytes) Contains datablock I

	Structure factor file (CIF format) (25.6 kbytes) Contains datablock II

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