Crystal structure of N-hy­droxy­picolinamide monohydrate

The crystal structure of the title compound, C(6)H(6)N(2)O(2)·H(2)O, consists of N-hy­droxy­picolinamide and water mol­ecules connected through O—H⋯O and N—H⋯N hydrogen bonds. The O—H⋯O inter­actions and π–π stacking inter­actions between the pyridine rings [centroid–centroid distance = 3.427 (1) Å] organize the components into columns extending along the b axis and the N—H⋯N hydrogen bonds link these columns into a two-dimensional framework parallel to (100). The N-hy­droxy­picolinamide mol­ecule adopts a strongly flattened conformation and only the O—H group H atom deviates significantly from the mol­ecule best plane. The dihedral angle between the hydroxamic group and the pyridine ring is 5.6 (2)°. The conformation about the hydroxamic group C—N bond is Z and that about the C—C bond between the pyridine and hydroxamic groups is E.