Hai-Zhen Xu

1,2‐Bis(1,3‐dithio­lan‐2‐ylidene)hydrazine

The title molecule, C6H8N2S4, possesses a crystallographically imposed center of symmetry. The two five-membered rings are in half-chair conformations. The crystal packing is stabilized mainly by van der Waals forces.

Bis(4-benzoyl-3-methyl-1-phenyl-1H-pyrazol-5-onato)­diethano­lcadmium(II)

The title complex, [Cd(C17H13N2O2)2(C2H5OH)2], is centrosymmetric with a distorted octahedral coordination geometry. The pyrazolone ring is almost coplanar with the adjacent fused chelate ring [dihedral angle = 2.90 (3)°].

4-[(Z)-Allyl-amino-(phen-yl)methyl-ene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.

The title compound, C20H19N3O, exists in a keto–enamine tautomeric form. The pyrazolone ring makes dihedral angles of 20.52 (10) and 77.73 (5)° with the two phenyl rings and an intramolecular N—H⋯O hydrogen bond occurs. A weak intermolecular C—H⋯O hydrogen bond is observed in the crystal structure. The allyl group is disordered over two positions, with site-occupancy factors of 0.533 (5) and 0.467 (5).

(4Z)-4-[(Cyclo-propyl-amino)(phen-yl)methyl-ene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one.

In the title compound, C20H19N3O, the dihedral angles formed by the pyrazolone ring with the two phenyl rings are 64.27 (6) and 17.00 (6)°. The molecular structure is stabilized by intramolecular N—H⋯O and C—H⋯O hydrogen bonds. In the crystal, the molecules are linked into chains along the b axis by intermolecular C—H⋯O hydrogen bonds.

1-sec-Butyl-3-[hy-droxy(1-methyl-1H-indol-3-yl)methyl-idene]pyrrolidine-2,4-dione.

In the title compound, C18H20N2O3, the dihedral angle between the indole ring system (r.m.s. deviation = 0.018 Å) and the hydroxymethylenepyrrolidine-2,4-dione plane (r.m.s. deviation = 0.036 Å) is 9.87 (7)°. The keto and enol groups are involved in an intramolecular O—H⋯O hydrogen bond. An intramolecular C—H⋯O interaction also occurs. The sec-butyl group is disordered over two orientations corresponding to an approximate 180° rotation about the N—C bond, with occupancies of 0.670 (6) and 0.330 (6). In the crystal, molecules are linked into chains along the c axis by C—H⋯O hydrogen bonds.

4-{(Z)-(sec-Butylamino)(phenyl)methylene}-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

In the title compound, C21H23N3O, the dihedral angles formed by the pyrazolone ring with two phenyl rings are 10.38 (8) and 76.94 (6)°. The sec-butylamino group is disordered over two positions, with refined site-occupancy factors of 0.730 (4) and 0.270 (4). The compound could potentially be ligand stabilized in the solid state in a keto–enamine tautomeric form. The amine functionality is involved in an intramolecular N—H⋯O hydrogen bond, while weak intermolecular C—H⋯O and C—H⋯N hydrogen bonds participate in the formation of the crystal structure.

(4Z)-4-[(4-Methoxy­benzyl­amino)(phen­yl)methyl­ene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

In the title compound, C25H23N3O2, the dihedral angles formed by the pyrazolone ring with the three aromatic rings are 14.59 (7), 79.35 (5) and 87.10 (6)°. Three intramolecular C—H⋯O, C—H⋯N and N—H⋯O hydrogen-bond interactions are present. The crystal structure is stabilized by two weak intermolecular C—H⋯O and C—H⋯N hydrogen-bond interactions.

6,7,8,9-Tetra­hydro-2H-1,2,4-triazolo[4,3-a]azepin-3(5H)-one

In the title compound, C7H11N3O, the seven-membered hetero-ring adopts a chair conformation. The five-membered ring is essentially coplanar with the fused back of the chair. The compound is stabilized by a strong intermolecular N—H⋯O hydrogen bond, forming a chain.

4,4-Di­methyl-3-oxo-N-phenyl-2-(1H-1,2,4-triazol-1-yl)­pentane­thio­amide monohydrate

In the title compound, C15H18N4O2S, the dihedral angle between the planes of the phenyl and triazole rings is 69.47 (9)°. There are weak O—H⋯N, N—H⋯O and O—H⋯S intermolecular interactions in the crystal structure, contributing to its stability.