Received 18 January 2013
In the title salt, 2C6H9N2O2S+·SO42-, the sulfate S atom is situated on a crystallographic twofold axis (the symmetry of the anion is 2). The anion exerts intense libration, which is manifested by shortening of the observed sulfate S-O bonds, as well as by features in the electron-density map. The crystal structure is stabilized through a three-dimensional hydrogen-bonding network formed by strong N-HO hydrogen bonds.
For information about folate synthesis, see: Kent (2000). For related structures, see: Pandiarajan et al. (2011); Zaouali Zgolli et al. (2010). For correction of the S-O distances in the sulfate anion due to libration movement, see: Nardelli (1995). For TLS approximation, see: Schomaker & Trueblood (1968). For graph-set motifs, see: Etter et al. (1990). For the categorization of hydrogen bonds, see: Desiraju & Steiner (1999).
Data collection: SMART (Bruker, 2001); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXTL/PC (Sheldrick, 2008); program(s) used to refine structure: SHELXTL/PC and JANA2006 (Petricek et al., 2006); molecular graphics: PLATON (Spek, 2009) and JANA2006; software used to prepare material for publication: SHELXTL/PC.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: FB2278 ).
SPR and BRK thank the management of the Devanga Arts College for their support and encouragement and also extend their thanks to the University Grants Commission for the financial support of this work in the form of a Minor Research Project.
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