N,N′-(4,5-Dimethyl-1,2-phenyl­ene)bis­(pyridine-2-carboxamide)

In the title compound, C₂₀H₁₈N₄O₂, the dihedral angles between the central benzene ring and the pyridine rings are 57.55 (6) and 22.05 (8)°. The mol­ecular conformation is stabilized by intra­molecular N—H...N inter­actions and in the crystal structure an inter­molecular asymmetric cyclic hydrogen-bonding association involving both amide N—H donors and a common amide O-atom acceptor gives a chain extending along the c axis.

2-Amino-6-(quinoline-2-carboxamido)­pyridinium nitrate

In the title salt, C₁₅H₁₃N₄O⁺·NO₃⁻, an extensive network of N—H...N, N—H...O and C—H...O hydrogen-bond inter­actions are observed throughout the structure. Further stabilization is obtained by π–π stacking inter­actions between inversion-related quinoline systems and inversion-related pyridine rings, with respective centroid–centroid distances of 3.5866 (6) and 3.3980 (6) Å.