Received 12 November 2012
The asymmetric unit of the title salt, C5H12N3O+·C3H5O3-, contains two carboxamidinium and two ethyl carbonate ions. In the crystal, the C-N bond lengths in the central CN3 units of the cations range between 1.324 (2) and 1.352 (2) Å, indicating partial double-bond character. The central C atoms are bonded to the three N atoms in a nearly ideal trigonal-planar geometry and the positive charges are delocalized in the CN3 planes. The morpholine rings are in chair conformations. The C-O bond lengths in both ethyl carbonate ions are characteristic for delocalized double bonds [1.243 (2)-1.251 (2) Å] and typical single bonds [1.368 (2) and 1.375 (2) Å]. In the crystal, N-HO hydrogen bonds between cations and anions generate a two-dimensional network in the ac plane.
For the synthesis and crystal structures of guanidinium hydrogen carbonates, see: Tiritiris et al. (2011). For the crystal structure of 4-morpholinecarboxamidine, see: Tiritiris (2012a). For the crystal structure of piperidine-1-carboxamidinium ethyl carbonate, see: Tiritiris (2012b).
Data collection: COLLECT (Hooft, 2004); cell refinement: SCALEPACK (Otwinowski & Minor, 1997); data reduction: SCALEPACK; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: KP2441 ).
The author thanks Dr F. Lissner (Institut für Anorganische Chemie, Universität Stuttgart) for the data collection.
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