2-Chloro­benzohydrazide

The asymmetric unit of the the title compound, C₇H₇ClN₂O, contains two mol­ecules in which the chloro­phenyl and the formic hydrazide units are almost planar (r.m.s. deviations of 0.0081 and 0.0100 Å, respectively, in one mol­ecule and 0.0069 and 0.0150 Å in the other) and are oriented with respect to each other at dihedral angles of 56.8 (2) and 56.9 (2)°. In the crystal, the mol­ecules are consolidated in the form of polymeric chains extending along [010]. R₃³(10) ring motifs exist due to N—H...O and N—H...N hydrogen bonds.

2-[(2-Meth­oxy­benzyl­idene)amino]­phenol

In the title compound, C₁₄H₁₃NO₂, the azomethine double bond adopts an E conformation and the benzene rings form a dihedral angle of 77.70 (7)°. In the crystal, mol­ecules are linked by O—H...N and C—H...O hydrogen bonds and arranged in a zigzag fashion, forming infinite chains parallel to the c axis, resulting in a graph-set R₂²(9) motif.

2-(4-Bromo­phen­yl)acetohydrazide

In the title compound, C₈H₉BrN₂O, the 1-bromo-4-methyl­benzene group and the formic hydrazide moiety [r.m.s. deviations of 0.0129 and 0.0038 Å] are oriented at a dihedral angle of 80.66 (11)°. In the crystal, mol­ecules are linked via strong N—H...O hydrogen bonds, leading to the formation of chains in the [010] direction. These chains are linked via weaker N—H...N and N—H...O hydrogen bonds, with R₂²(7) and R₃²(7) ring motifs, forming a two-dimensional network parallel to (001).