(E)-4-Meth­oxy-N′-[(pyridin-4-yl)methyl­idene]benzohydrazide monohydrate

In the title compound, C₁₄H₁₃N₃O₂·H₂O, the azomethine double bond adopts an E conformation and the N—N=C—C torsion angle is 178.37 (19)°. The dihedral angle between the benzene and pyridine rings is 5.58 (12)° and the C atom of the meth­oxy group is roughly coplanar with its attached ring [deviation = 0.157 (3) Å]. In the crystal, the components are linked by O—H...O, O—H...N, N—H...O and C—H...O hydrogen bonds, forming (001) sheets. The water O atom accepts one N—H...O and two C—H...O inter­actions from the adjacent organic mol­ecule.

(E)-N′-(3,4-Dimeth­oxy­benzyl­idene)-4-meth­oxy­benzohydrazide

In the title compound, C₁₇H₁₈N₂O₄, the azomethine double bond adopts an E conformation with an N—N—C—C torsion angle of −178.3 (3)°. The benzene rings are almost coplaner, with a dihedral angle of 2.98 (14)° between their mean planes. In the crystal, the molecules are linked by N—H...O hydrogen bonds, resulting in chains of mol­ecules lying parallel to the b axis. The structure is further consolidated by rather weak C—H...O hydrogen-bonding inter­actions, resulting in six-membered rings about inversion centers linked into chains arranged parallel to the b axis.