Received 13 May 2013
aDepartment of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641 020, Tamil Nadu, India,bSchool of Chemistry, University of Hyderabad, Hyderabad 500 046, Andhra Pradesh, India, and cDepartment of Physics, The New College (Autonomous), Chennai 600 014, India
Correspondence e-mail: firstname.lastname@example.org
In the title molecular salt, C6H11N3O22+·2C6H2N3O7-·2H2O, the histidine molecule exists as a histidinium dication, being protonated at the N atom of the imidazole ring. The charges are balanced by two picrate anions and the compound crystallizes as a dihydrate. In the crystal, the components are linked via N-HO and O-HO hydrogen bonds and weak C-HO interactions, forming a three-dimensional supermolecular structure.
For the role of hydrogen bonding in the construction of supramolecular structures, see: Braga et al. (2004); Harrowfield et al. (1995). For picrates of biologically important molecules, see: Harrison et al. (2007); Swamy et al. (2007); Bibal et al. (2003); Olsher et al. (1996). For bond angles in related structures, see: Yang et al. (2001).
Data collection: APEX2 (Bruker, 2004); cell refinement: APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2008); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2602 ).
MS thanks the UGC Networking Centre, School of Chemistry, University of Hyderabad, India, for the award of a Visiting Research Fellowship to use the facilities at the School, which the authors also thank for access to the X-ray diffraction equipment.
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