2-{[2-(2-Hy­droxy-5-meth­oxy­benzyl­idene)hydrazin-1-yl­idene]meth­yl}-4-meth­oxy­phenol

The title phenyl­hydrazine derivative, C₁₆H₁₆N₂O₄, has a crystallographically imposed centre of symmetry. Except for the methyl group, all non-H atoms are almost coplanar (r.m.s. deviation = 0.0095 Å). Intra­molecular O—H...N hydrogen bonds are observed, generating S(6) graph-set ring motifs.

(E)-3-Chloro-N′-(2-fluoro­benzyl­idene)thio­phene-2-carbohydrazide

The title compound, C₁₂H₈ClFN₂OS, is a hydrazide derivative adopting an E conformation with an azomethine N=C double bond length of 1.272 (2) Å. The mol­ecular skeleton is approximately planar; the terminal five- and six-membered rings form a dihedral angle of 5.47 (9)°. In the crystal, mol­ecules are linked by N—H...O and C—H...O hydrogen bonds into zigzag chains propagating in [100].