N,N'-Bis[(E )-quinoxalin-2-ylmethylidene]ethane-1,2-diamine

In the molecule of the title compound, C20H16N6, the central C—C bond lies on a crystallographic inversion centre. The quinoxalidine ring is nearly planar, with a maximum deviation of 0.021 (2) A ˚ from the mean plane. The crystal structure is stabilized by intermolecular C—H....N interactions, leading to the formation of a layer-like structure, which extends along the a axis

(Z)-2-Amino-3-[(E )-benzylideneamino]but-2-enedinitrile

The asymmetric unit of the title compound, C11H8N4, contains two independent molecules. In the crystal structure, intermolecular N—H.....N hydrogen bonds link molecules into ribbons extended in the [100] direction

N-[(E )-Quinoxalin-2-ylmethylidene]-1H-indazol-5-amine

In the title molecule, C16H11N5, the mean planes of the quinoxaline and indazole fragments form a dihedral angle of 10.62 (5). In the crystal, weak intermolecular N—H..........N hydrogen bonds link the molecules into zigzag chains extending in the [001] direction. The crystal packing also exhibits pye interactions [centroid–centroid distances of 3.7080 (2) and 3.8220 (5) A ˚ ], which form stacks of the molecules parallel to the a axis

(E)-2-(4-Benzyloxy-2-hydroxybenzylidene)- N-phenylhydrazinecarbothioamide

The title compound, C21H19N3O2S, exists in the thione form. The configuration about the C N bond is E. The hydrazinecarbothioamide unit adopts an almost planar arrangement, with maximum deviations of 0.016 (3) and 0.016 (2) A ° for the two thiourea N atoms. An intramolecular O—H N hydrogen bond occurs. Weak intermolecular N— H S, C—H O and C—H interactions are observed in the crystal structure