M. Saeed Butt

N,N′-Bis(4-hy­droxy­phen­yl)pyridine-2,6-dicarboxamide di­methyl­formamide monosolvate

The molecular structure of the pyridine derivative, C19H15N3O4·C3H7NO, shows almost planar geometry with dihedral angles of 6.9 (1) and 13.4 (1)° between the pyridine ring and the two benzene rings. This conformation is stabilized by two intramolecular N—H⋯N(pyridine) bonds. In the crystal, strong O—H⋯O(carboxamide) and N—H⋯O(hydroxyphenyl) hydrogen bonds link the molecules, forming a three-dimensional structure. The dimethylformamide solvent molecules are not involved in the hydrogen bonding. The structure shows pseudosymmetry, but refinement in the space group Pbcn leads to significantly worse results and a disordered dimethylformamide molecule.