Synthesis and Crystal Structures of 4-Chloro- N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide monohydrate and 4-Chloro- N′-(4-hydroxy-3-methoxybenzylidene)benzohydrazide monohydrate.

Two new hydrazone compounds, 4-chloro- N′-(4-hydroxy-3-nitrobenzylidene)benzohydrazide monohydrate ( 1) and 4-chloro- N′-(4-hydroxy-3-methoxybenzylidene)benzohydrazide monohydrate ( 2), were synthesized and characterized by physico-chemical methods and single crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic space group P2/ c with unit cell parameters a = 23.257(3) Å, b = 4.829(1) Å, c = 12.763(2) Å, β = 96.017(2)°, V = 1425.5(5) Å, Z = 4, R = 0.0525, and wR = 0.1120. Compound 2 crystallizes in the monoclinic space group P2/ c with unit cell parameters a = 8.103(3) Å, b = 21.321(3) Å, c = 10.594(3) Å, β = 120.281(2)°, V = 1580.5(8) Å, Z = 4, R = 0.0480, and wR = 0.1078. Both compounds contains a hydrazone molecule and a water molecule. The crystals of the compounds are stabilized by N-H···O, O-H···O, and O-H···N hydrogen bonds. Graphical Abstract: Two new hydrazone compounds have been synthesized and characterized by physico-chemical methods and single crystal X-ray diffraction. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]