Wan Jefri Basirun

3-Hydroxysalicylaldehyde benzoylhydrazone

The crystal structure of 3-hydroxysalicylaldehyde benzoylhydrazone was analyzed. The planar conformation of the salicylaldehyde-benzoyl-hydrazone class of Schiff bases originated from water molecules that stabilized the structures. 3-hydroxysalicylaldehyde benzoylhydrazone possessed a 3-hydroxy substituent that was capable of stabilization, but the compound did not contain water. Meanwhile, the amido H atom formed a short hydrogen bond with the amido O atom of an adjacent molecule to give rise to a linear chain running along the shortest axis of the orthorhombic unit cell.

3-Hydroxysalicylaldehyde 2-furoylhydrazone

The molecular structure of C12H10N2O 4 was investigated. The molecule was found to be planar and two molecules were stacked over one another at a distance of 3.6 A. In the compound, the 3-hydroxy substituent was observed to be forming an intermolecular hydrogen bond to the carbonyl O atom of an adjacent molecule. The molecules were linked by hydrogen bonds into a three-dimensional network.

2′-(1H-Indol-3-ylmethyl­ene)benzene­sulfonohydrazide

The molecules of of the title compound, C15H13N3O2S, are linked by N-amino-H center dot center dot O-sulfonyl and N-indolyl-H center dot center dot center dot N-imino hydrogen bonds into a layer.

3-Hydroxysalicylaldehyde 2-thienoylhydrazone

The two independent molecules of the title compound, C12H 10N2O3S, are approximately planar and one is stacked over the other. One of the two molecules interacts with its symmetry-related neighbors to form a hydrogen-bonded helical chain that runs along the shortest axis of the orthorhombic unit cell. The second independent molecule does not form such a chain; instead, it is merely linked to the other independent molecule by a hydrogen bond.

2‐Oxo‐2,3‐di­hydro‐1H‐indol‐3‐one nicotinoyl­hydrazone

In the title structure, C14H10N4O 2, the pyridyl ring is twisted with respect to the central -C(=O)-NH-N= fragment by 17.7 (1)°, whereas the indole fused-ring system is almost coplanar with this fragment. Molecules are linked into a linear chain motif by N-H⋯O hydrogen bonds.

5-Methoxysalicylaldehyde 3-methoxybenzoylhydrazone

The molecular and crystal structure of 5-Methoxysalicylaldehyde 3-methoxybenzoyl-hydrazone were investigated. It was observed that the molecules of the compound, were linked by hydrogen bonds into a zigzag chain along the c axis of the monoclinic cell. It was also observed that the aromatic ring of the compound having the hydroxy substituent was twisted by 20.0 (1) ° with respect to the planar -N=N-C(=O)- fragment, whereas the other aromatic ring was twisted by 31.1 (1)°. It was found that the crystal structure featured a long b axis and adjacent molecules interact via hydrogen bonds to form a zigzag chain along the c axis.

N-(4-methoxybenzoyl)-N \-(4-methoxyphenyl)thiourea

Molecules of the title compound, C16H16N 2O3S, are linked by N-H⋯S hydrogen bonds to form centrosymmetric dimers [N⋯S = 3.4501 (13) A]. The N′-phenyl and N-phenyl rings are twisted by 52.7(1) and 23.3(1)°, respectively, from the essentially planar -NHC(=S)NC(=O)- moiety.

5-Bromo-1H-indole-3-carbaldehyde 2-thienoylhydrazone

In the title molecule, C14H10BrN3OS, the indole moiety is twisted by 36.0(2)° with respect to the disordered thienyl group and the nitrogen-bound H atoms interact with the amide O atoms of symmetry-related molecules, resulting in an N-H⋯O hydrogen-bonded layer structure.