N-(4-Hydr-oxy-3-methoxy-benz-yl)benzamide.

In the mol-ecular structure of the title compound, C(15)H(15)NO(3), the two benzene rings are twisted with respect to each other, making a dihedral angle of 75.11 (10)°. In the amide fragment, the C=O and C-N bond distances are 1.248 (3) and 1.321 (3) Å, respectively, indicating electron delocalization. A partially ovelapped arrangement between parallel hydroxy-methoxy-benzene rings is observed in the crystal structure, and the face-to-face distance of 3.531 (16) Šsuggests the existence of weak π-π stacking. N-H⋯O and O-H⋯O hydrogen bonding is also present in the crystal structure.

N'-[(E)-3-Indol-3-ylmethyl-ene]isonicotino-hydrazide monohydrate.

Crystals of the title compound, C(15)H(12)N(4)O·H(2)O, were obtained from a condensation reaction of isonicotinylhydrazine and 3-indolylformaldehyde. The mol-ecule assumes an E configuration, with the isonicotinoylhydrazine and indole units located on the opposite sites of the C=N double bond. In the mol-ecular structure the pyridine ring is twisted with respect to the indole ring system, forming a dihedral angle of 44.72 (7)°. Extensive classical N-H⋯N, N-H⋯O, O-H⋯O and O-H⋯N hydrogen bonding and weak C-H⋯O inter-actions are present in the crystal structure.

Benzyl 3-[(E)-benzyl-idene]dithio-carbazate.

Crystals of the title compound, C(15)H(14)N(2)S(2), were obtained from a condensation reaction of benzyl dithio-carbazate and benzaldehyde. The mol-ecule assumes an E configuration about the N=C double bond. The phenyl ring of the thio-ester group is nearly perpendicular to the dithio-carbazate plane, with a dihedral angle of 84.60 (5)°. In the crystal structure, inter-molecular N-H⋯S hydrogen bonding links adjacent mol-ecules to form a centrosymmetric supra-molecular dimer.

Methyl 3-[(E)-1-(4-amino-phen-yl)ethyl-idene]dithio-carbazate.

The title compound, C(10)H(13)N(3)S(2), was obtained from a condensation reaction of methyl dithio-carbazate and 4-amino-acetophenone. In the crystal structure, the nearly planar mol-ecule assumes an E configuration, the benzene ring and dithio-carbazate group being located on opposite sides of the N=C bond. C-H⋯π inter-actions and N-H⋯S hydrogen bonding are present in the crystal structure.

Benzyl 3-[(E)-furfuryl-idene]dithio-carbazate.

In the title compound, C(13)H(12)N(2)OS(2), the mol-ecule assumes an E configuration, with the furan ring and dithio-carbazate units located on opposite sides of the N=C double bond. In the crystal structure, mol-ecules are linked via two inter-molecular N-H⋯S hydrogen bonds to form centrosymmetric dimers.

(E)-2-Furyl methyl ketone 2,4-dinitro-phenyl-hydrazone.

Crystals of the title compound, C(12)H(10)N(4)O(5), were obtained from a condensation reaction of 2,4-dinitro-phenyl-hydrazine and 2-furyl methyl ketone. The mol-ecule displays a nearly planar structure, and the furan ring is slightly twisted by a dihedral angle of 12.62 (6)° with respect to the phenyl-hydrazone plane. The face-to-face separation of 3.287 (7) Šbetween parallel benzene rings of adjacent mol-ecules indicates the existence of π-π stacking between dinitro-phenyl rings in the crystal structure.

(E)-Methyl 1,3-thia-zol-2-yl ketone 2,4-dinitro-phenyl-hydrazone.

Crystals of the title compound, C(11)H(9)N(5)O(4)S, were obtained from a condensation reaction of 2,4-dinitro-phenyl-hydrazine and methyl 1,3-thia-zol-2-yl ketone. Excluding two methyl H atoms, the mol-ecule displays a planar structure, the dihedral angle between the terminal thia-zole and benzene rings being 1.82 (8)°. The imino group links with adjacent nitro and thia-zole groups by intra-molecular bifurcated hydrogen bonding. The centroid-centroid separation of 3.7273 (11) Šbetween nearly parallel benzene and thia-zole rings of adjacent mol-ecules indicates the existence of π-π stacking in the crystal structure. Weak inter-molecular C-H⋯O hydrogen bonding is also observed.

Methyl 3-[(E)-furfuryl-idene]dithio-carbazate.

The mol-ecule of the title Schiff base compound, C(7)H(8)N(2)OS(2), prepared by the reaction of methyl dithio-carbazate and furfural in an ethanol solution under reflux, adopts an E configuration; the dithio-carbazate and furan units are located on opposite sides of the C=N double bond. The planar dithio-carbazate group is twisted slightly with respect to the furan ring, making a dihedral angle of 5.2 (1)°. Adjacent mol-ecules are linked by N-H⋯S hydrogen bonding to form a supra-molecular dimer across an inversion center.

3-Penta-none 2,4-dinitro-phenyl-hydrazone.

Crystals of the title compound, C(11)H(14)N(4)O(4), were obtained from a condensation reaction of 2,4-dinitro-phenyl-hydrazine and 3-penta-none. In the crystal structure, the mol-ecule, except one methyl group, displays a nearly planar structure. The imino group links to the adjacent nitro group via intra-molecular hydrogen bonding. The partially overlapped arrangement and face-to-face separation of 3.410 (9) Šbetween parallel benzene rings indicate the existence of π-π stacking between adjacent mol-ecules. The crystal structure also contains weak inter-molecular C-H⋯O hydrogen bonding.

(E)-2-Acetyl-pyrazine 4-nitro-phenyl-hydrazone.

In the title compound, C(12)H(11)N(5)O(2), the mol-ecule adopts an E configuration, with the benzene and pyrazine rings located on opposite sides of the N=C double bond. The face-to-face separations of 3.413 (14) and 3.430 (8) Å, respectively between parallel benzene rings and between pyrazine rings indicate the existence of π-π stacking between adjacent mol-ecules. The crystal structure also contains N-H⋯N and C-H⋯O hydrogen bonding.

(E)-1-(3-Methoxy-phen-yl)ethanone 4-nitro-phenyl-hydrazone.

Crystals of the title compound, C(15)H(15)N(3)O(3), were obtained from a condensation reaction of 4-nitro-phenyl-hydrazine and 3-methoxy-acetophenone. In the crystal structure, the methoxy-phenyl ring is twisted slightly with respect to the nitro-phenyl-hydrazine plane, making a dihedral angle of 14.81 (8)°. The nitro and meth-oxy groups are each coplanar with the attached benzene rings. The nitro-phenyl and methoxy-phenyl groups are located on opposite sides of the C=N double bond, indicating an E configuration of the mol-ecule. Adjacent mol-ecules are linked together via N-H⋯O hydrogen bonding, forming chains along the [101] direction.

(E)-N'-[1-(4-Amino-phen-yl)ethyl-idene]benzohydrazide.

Crystals of the title compound, C(15)H(15)N(3)O, were obtained from a condensation reaction of benzohydrazide and 1-(4-amino-phen-yl)ethanone. The mol-ecule assumes an E configuration with the amino-phenyl and benzohydrazide units located on opposite sites of the C=N double bond. In the crystal structure, the benzene rings of the mol-ecule are slightly twisted with respect to the central hydrazide, the dihedral angles being 18.22 (12) and 27.62 (12)°. The crystal structure contains inter-molecular N-H⋯O and weak C-H⋯N hydrogen bonding.

2-Methyl-benzaldehyde 2-methyl-benzyl-idenehydrazone.

The mol-ecule of the title compound, C(16)H(16)N(2), is centrosymmetric and the dihedral angle between the benzene ring and the dimethyl-hydrazine mean plane is 16.11 (15)°.

3-Ethyl-4-[(E)-2-methyl-benzyl-idene-amino]-1H-1,2,4-triazole-5(4H)-thione.

Crystals of the title compound, C(12)H(14)N(4)S, were obtained from a condensation reaction of 4-amino-3-ethyl-1H-1,2,4-triazole-5(4H)-thione and 2-methyl-benzaldehyde. In the mol-ecular structure, there is a short N=C double bond [1.255 (2) Å], and the benzene and triazole rings are located on opposite sites of this double bond. The two rings are approximately parallel to each other, the dihedral angle being 1.75 (11)°. A partially overlapped arrangement is observed between the nearly parallel triazole and benzene rings of adjacent mol-ecules; the perpendicular distance of the centroid of the triazole ring from the benzene ring is 3.482 Å, indicating the existence of π-π stacking in the crystal structure.

(E)-Methyl 3-(2-nitro-benzyl-idene)dithio-carbazate.

The asymmetric unit of the title compound, C(9)H(9)N(3)O(2)S(2), contains two independent mol-ecules, A and B, with similar bond dimensions. In both mol-ecules, the nitro group is tilted with respect to the aromatic ring [dihedral angles 32.0 (1)° in mol-ecule A and 34.0 (1)° in mol-ecule B]. The dithio-carbazate unit is nearly coplanar with the aromatic ring in both mol-ecules. For mol-ecule B, pairs of mol-ecules are linked by N-H⋯O and C-H⋯O hydrogen bonds about a centre of symmetry to form a dimer, whereas mol-ecules A are not involved in hydrogen bonding in the crystal structure.