Received 1 September 2012
aDepartment of Physics, Panimalar Engineering College, Chennai 600 123, India,bDepartment of Physics, Presidency College, Chennai 600 005, India,cDepartment of Physics, Aksheyaa College of Engineering, Kancheepuram 603 314, India, and dDepartment of Physics, CPCL Polytechnic College, Chennai 600 068, India
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In the title molecular salt, C6H6NO2+.C4H3O4-, the 2-carboxypyridinium cation is essentially planar with a maximum deviation of 0.003 (3) Å. In the crystal, adjacent cations and anions are linked by an extensive system of weak N-HO, O-HO and C-HO interactions, forming a layer parallel to the ab plane.
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RK2380 ).
The authors wish to acknowledge the SAIF, IIT Madras, for the data collection.
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