Received 7 April 2009
The dianion of the title salt, 2C5H6N+·C12H6N2O4S22-, lies on a special position of 2 site symmetry that relates one thionicotinate part to the other, and the dihedral angle between the niotinate planes is 89.2 (2)°. The pyridinium cations are hydrogen bonded to the carboxylate group by way of N-HO links.
The structure is a non-merohedral twin; for the program to model twinned crystal structures, see: Spek (2003). For 1,1'-dithio-2,2'-dinicotinic acid, see: Zhu et al. (2002). For the methyl, ethyl and n-butyl esters, see: Cindric et al. (2001); Toma et al. (2004).
Data collection: APEX2 (Bruker, 2008); cell refinement: SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SI2170 ).
We thank the University of Malaya for supporting this study.
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Zhu, J.-X., Zhao, Y.-J., Hong, M.-C., Sun, D.-F., Shi, Q. & Cao, R. (2002). Chem. Lett. pp. 484-485.