2,3-Dimethoxy­benzaldehyde isonicotinoyl­hydrazone chloro­form monosolvate, and the mono- and dihydrates of 3,4,5-trimethoxy­benzaldehyde isonicotinoyl­hydrazone: hydrogen-bonded supra­molecular structures in one, two and three dimensions

In 2,3-dimethoxy­benzaldehyde isonicotinoyl­hydrazone chloro­form monosolvate, C₁₅H₁₅N₃O₃·CHCl₃, the hydrazone mol­ecules are linked by a combination of N—H...N and C—H...N hydrogen bonds into chains from which the chloro­form mol­ecules are pendent. 3,4,5-Trimethoxy­benzaldehyde isonicotinoyl­hydrazone forms two stoichiometric hydrates. In the monohydrate, C₁₆H₁₇N₃O₄·H₂O, the components are linked into sheets by a combination of O—H...O, O—H...N and N—H...N hydrogen bonds, and in the dihydrate, C₁₆H₁₇N₃O₄·2H₂O, a combination of O—H...O, O—H...N and N—H...O hydrogen bonds links the components into a three-dimensional framework structure.