Research Article: Bis(2,3-diamino­pyridinium) succinate trihydrate

Date Published: August 01, 2009

Publisher: International Union of Crystallography

Author(s): Hoong-Kun Fun, Kasthuri Balasubramani, Chin Sing Yeap.


In the title salt, 2C5H8N3+·C4H4O42−·3H2O, the asymmetric unit contains a protonated 2,3-diamino­pyridinium cation, half of a succinate dianion (disposed about a centre of inversion), and one and a half water mol­ecules. One of the water mol­ecules is disordered over two sites with occupancies of 0.670 (17) and 0.330 (17). The other water mol­ecule has an occupancy of 0.5 (from refinement). The pyridine N atom of the 2,3-diamino­pyridine mol­ecule is protonated. The protonated N atom and one of the 2-amino H atoms are hydrogen bonded to the succinate anion through a pair of N—H⋯O hydrogen bonds, forming an R22(8) ring motif. In the crystal, mol­ecules are consolidated into a three-dimensional network by N—H⋯O and O—H⋯O inter­actions.

Partial Text

For substituted pyridines, see: Pozharski et al. (1997 ▶); Katritzky et al. (1996 ▶); Jeffrey & Saenger (1991 ▶); Jeffrey (1997 ▶); Scheiner (1997 ▶). For related structures, see: De Cires-Mejias et al. (2004 ▶); Fun & Balasubramani (2009 ▶); Balasubramani & Fun (2009a ▶,b ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).




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