Received 21 April 2013
In the title hydrated molecular salt, C6H16NO+·C10H5N4O7-·1.5H2O [systematic name: N,N-diethyl-2-hydroxyethanaminium 5-(2,4-dinitrophenyl)-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-olate sesquihydrate], the dihedral angle between the six-membered rings in the anion is 37.66 (11)°. The nitro groups ortho and para to the ring junction are rotated from their attached ring by 40.8 (3) and 23.5 (3)°, respectively. The ethanol group is disordered over two of the `arms' of the cation in a statistical ratio. In the crystal,  chains of anions occur, linked by N-HO and O-HO hydrogen bonds, which generate R22(8) loops. Further N-HO and O-HO hydrogen bonds link the components into a three-dimensional network. One of the water O atoms lies near an inversion centre and is 50% occupied.
For related barbiturates, see: Kalaivani et al. (2008); Kalaivani & Buvaneswari (2010); Buvaneswari & Kalaivani (2011); Babykala & Kalaivani (2012).
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SIR92 (Altomare et al., 1993); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB7074 ).
The authors are thankful to the SAIF, IIT Madras, for the data collection.
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