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In the title salt, C 5 H 8 N 3+ ·C 6 H 7 O 2− , the pyridine N atom of the 2,3-diamino­pyridine mol­ecule is protonated. The 2,3-diamino­pyridinium cation is essentially planar, with a maximum deviation of 0.068 (2) Å for one of the amino N atoms. The sorbate anion adopts an extended conformation. In the crystal structure, the protonated N atom and one of the two amino-group H atoms are hydrogen bonded to the sorbate anion through a pair of N—H⋯O hydrogen bonds, forming an  R22 (8) ring motif. The ion pairs are further connected  via  inter­molecular N—H⋯O and C—H⋯O hydrogen bonds, forming two-dimensional networks parallel to (100).

2,3-Diaminopyridinium (2E,4E)-hexa-2,4-dienoate