Received 4 July 2010
The title compound, C12H8N2O4, crystallizes as a zwitterion in which the pyridyl N atom is protonated. The dihedral angle between the benzene and pyridinium rings is 27.9 (2)°. In the crystal, N-HO hydrogen bonds link adjacent zwitterions into a three-dimensional structure.
The title compound was reacted with MgCl2 under hydrothermal conditions in an attempt to obtain a new coordination polymer as part of our investigation of pyridine caboxylate coordination polymers. For the advantages of hydrothermal synthesis, see: Feng et al. (2001); Tao et al. (2001). For the crystal structures of coordination polymers involving 4-pyridinecarboxylate ligands, see: Lu et al. (2003).
Data collection: SMART (Bruker, 2007); cell refinement: SAINT (Bruker, 2007); data reduction: SAINT; 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: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WN2400 ).
The authors acknowledge Pingdingshan University for supporting this work.
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Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Tao, J., Zhang, X. M., Tong, M. L. & Chen, X. M. (2001). J. Chem. Soc. Dalton Trans. pp. 770-771.