Received 27 December 2008
aKey Laboratory of Science and Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, People's Republic of China,bDepartment of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore 570 006, India,cDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri 574 199, India, and dRL Fine Chem, Bangalore 560 064, India
Correspondence e-mail: email@example.com
The title compound, C13H19N2O2+·C6H2N3O7-, is a salt obtained by cocrystallization of 4-[(4-methylpiperazin-1-yl)methyl]benzoic acid and picric acid. The cations adopt an `L-shaped' conformation and are linked into chains along  by O-HN hydrogen bonds. The NH group of each piperazinium ring forms a hydrogen bond to the phenolate O atom of a picrate anion, and the picrate anions form face-to-face contacts with an interplanar separation of 3.023 (1) Å.
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); 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: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: BI2341 ).
QNMHA thanks R. L. Fine Chem, Bangalore, for a gift sample of 4-[(4-methylpiperazin-1-yl)methyl]benzoic acid. HSY thanks the University of Mysore for research facilities.
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