N′-[4-(diethylamino)benzylidene]pyrazine-2-carbohydrazide dihydrate

The title compound, C16H19N5O center dot 2H(2)O, was synthesized by the reaction of pyrazine-2-carbohydrazide with 4-(diethylamino) benzaldehyde in methanol. The molecule is nearly planar, with a dihedral angle of 11.95 (3)degrees between the pyrazine and benzene rings. The C -C -N -N torsion angles are 3.43 (3) and 4.46 (3)degrees. Molecules are linked by O-H center dot center dot center dot O and O-H center dot center dot center dot N hydrogen bonds involving all the potential donors. The pyrazine rings and the phenyl rings show weak face-to-face pi-pi stacking interactions.