N′-[(E)-2-Hy­droxy-3,5-diiodo­benzyl­idene]cyclo­hexa­ne-1-carbohydrazide

In the title compound, C14H10I2N2O2, the two aromatic rings are inclined at a dihedral angle of 16.72 (33)°. The mol­ecular structure is stabilized by an intra­molecular O—H⋯N hydrogen bond. In the crystal, inter­molecular N—H⋯O inter­actions link the mol­ecules into chains running along the c axis. C—H⋯O inter­actions also occur. The crystal used for the structure determination was a non-merohedral twin with a domain ratio of 0.972 (2):0.028 (2)

N′-[(1E)-3-Bromo-5-chloro-2-hy­droxy­benzyl­idene]-4-tert-butyl­benzo­hydrazide ethanol monosolvate

In the title compound, C18H18BrClN2O2·C2H6O, the hy­droxy group forms an intra­molecular O—H⋯N hydrogen bond, which influences the conformation of the Shiff base mol­ecule, where the two aromatic rings form a dihedral angle of 21.67 (8)°. Inter­molecular N—H⋯O and O—H⋯O hydrogen bonds link two Shiff base mol­ecules and two solvent mol­ecules into a centrosymmetric heterotetra­mer. Weak inter­molecular C—H⋯O inter­actions link further tetra­mers related by translation along the a axis into chains

N′-[(E)-2-Hy­droxy-3,5-diiodo­benzyl­idene]pyridine-3-carbohydrazide

In the title compound, C13H9I2N3O2, the dihedral angle between the two aromatic rings is 10.5 (2)°. The mol­ecule displays a trans configuration with respect to the C=N bond. An intra­molecular O—H⋯N hydrogen bond occurs. The crystal packing is stabilized by N—H⋯O and C—H⋯O hydrogen bonds