(E)-N′-(3,4-Di­meth­oxy­benzyl­idene)nicotinohydrazide monohydrate

In the title hydrated compound, C₁₅H₁₅N₃O₃·H₂O, the nicotinohydrazide mol­ecule adopts a trans conformation with respect to the C=N double bond. The dihedral angle between the benzene and pyridine rings is 5.10 (14)°. In the crystal, the solvent water mol­ecule acts as an acceptor, forming an N—H...O hydrogen bond supported by two C—H...O contacts. It also acts as a donor, forming bifurcated O—H...(O,O) and O—H...N hydrogen bonds that combine with the former contacts to form zigzag chains of mol­ecules along the c-axis direction. An additional O—H...O donor contact completes a set of six hydrogen bonds to and from the water mol­ecule and connects it to a third nicotinohydrazide mol­ecule. This latter contact combines with weaker C—H...O hydrogen bonds supported by a C—H...π contact to stack mol­ecules along b in a three-dimensional network.