Received 25 November 2009
In the cation of the title compound, C9H11N2O4+·ClO4-, the conformation is stabilized by an intramolecular N-HO hydrogen bond. In the crystal packing, centrosymmetrically related cations interact through intermolecular O-HO hydrogen bonds involving the carboxy groups, forming dimers. The dimers and the perchlorate anions are further linked into layers parallel to the ab plane by C-HO and N-HO hydrogen-bonding interactions.
Data collection: CrystalClear (Rigaku 2005); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: PRPKAPPA (Ferguson, 1999).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RZ2399 ).
This work was supported by the Technical Fund Financing Projects (No. 9207042464 and 9207041482) from Southeast University to ZRQ.
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