3-[(2-Hydro­xy­benzyl­idene)­hydrazino­carbonyl]-1H-1,2,4-triazole ethanol solvate

The title compound, C₁₀H₉N₅O₂·C₂H₆O, was synthesized by the reaction of 3-hydrazino-1H-1,2,4-triazole with 2-hydroxy­benz­aldehyde in ethanol. The crystal structure involves intermolecular O—H...O, N—H...O and N—H...N hydrogen bonds; intramolecular O—H...N and N—H...N hydrogen bonds are also found.

N,N′-Bis(3-pyridyl­methyl)­benzene-1,4-dicarbox­amide dihydrate

The title compound, C₂₀H₁₈N₄O₂·2H₂O, an amide-containing bipyridyl-type compound, crystallizes as a dihydrate. The organic molecule is centrosymmetric. Hydro­gen-bonding and π–π stacking interactions in the crystal structure result in the formation of an infinite three-dimensional supramolecular network.

N′-Benzoyl-4H-1,2,4-triazole-3-carbohydrazide

In the crystal structure of the title compound, C₁₀H₉N₅O₂, inter­molecular N—H...N [H...N = 2.13 (2) Å] and N—H...O [H...O = 2.016 (18) and 2.05 (2) Å] hydrogen bonds link mol­ecules into a two-dimensional framework.