title: 2,3-Diamino-pyridinium 6-carb-oxy-pyridine-2-carboxyl-ate.
abstract: The asymmetric unit of the title proton-transfer compound, C(5)H(8)N(3) (+)·C(7)H(4)NO(4) (-), consists of one mono-deprotonated pyridine-2,6-dicarb-oxy-lic acid as anion and one protonated 2,3-diamino-pyridine as cation. The crystal packing shows extensive O-H⋯O, N-H⋯O and N-H⋯N hydrogen bonds. Thre are also several π-π inter-actions between the anions and also between the cations [centriod-centroid distances = 3.6634 (7), 3.7269 (7), 3.6705 (7) and 3.4164 (7) Å].
authors.forename: Mahsa
authors.initials: M
authors.lastname: Foroughian
authors.forename: Alireza
authors.initials: A
authors.lastname: Foroumadi
authors.forename: Behrouz
authors.initials: B
authors.lastname: Notash
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Bruno
authors.forename: Hadi
authors.initials: H
authors.lastname: Amiri Rudbari
authors.forename: Hossein
authors.initials: H
authors.lastname: Aghabozorg