The supramolecular structure of pyridine‐2,6‐dicarboxylic acid

The structure of pyridine‐2,6‐di­carboxyl­ic acid, C₇H₅NO₄, has been determined at 0.71 Å resolution. The mol­ecule is located on a site with mirror symmetry. A one‐dimensional supra­molecular structure is stabilized in the solid state through a strong symmetric double hydrogen bond, with H?O distances of 1.86 (3) Å and O—H?O angles of 167 (3) and 171 (5)°. This arrangement is similar but not identical to that reported for the isoelectronic isophthalic acid (benzene‐1,3‐di­carboxyl­ic acid).