Research Article: Bis(2,3-diamino­pyridinium) phthalate dihydrate

Date Published: February 01, 2012

Publisher: International Union of Crystallography

Author(s): Madhukar Hemamalini, Jia Hao Goh, Hoong-Kun Fun.


The complete anion of the title hydrated mol­ecular salt, 2C5H8N3+·C8H4O4−·2H2O, is generated by a crystallographic twofold axis. In the crystal, the cations, anions and water mol­ecules are connected by N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, forming a three-dimensional network. The crystal structure also features C—H⋯π inter­actions.

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For background to hydrogen-bonding patterns of 2-amino­pyridine derivatives, see: Gellert & Hsu (1988 ▶); Banerjee & Murugavel (2004 ▶). For related structures, see: Hemamalini & Fun (2010a ▶,b ▶,c ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶).