In the title mol-ecule, C(25)H(23)N(3)O(2), the pyrazole ring forms dihedral angles of 28.56 (7), 80.35 (7) and 31.99 (7)° with the phenyl ring, the p-tolyl ring and the p-tolyl-amino ring, respectively. The N-H group attached to the exocyclic C=C bond is in a syn arrangement with respect to the C=O bond of the pyrazolone group and an intra-molecular N-H⋯O hydrogen bond is observed. In the crys...

In the centrosymmetric title compound, C(20)H(24)N(2)O(6)S(2), the N-H and C=O bonds are trans to each other. In the crystal, inter-molecular N-H⋯O(S) hydrogen bonds link the mol-ecules into zigzag chains running along the b axis. The O atom involved in the hydrogen bond has a longer S-O bond than the other O atom bonded to S [1.441 (2) versus 1.428 (2) Å].

In the title compound, C(12)H(8)Cl(3)NO(2)S, the conformation of the N-H bond in the C-SO(2)-NH-C segment is syn to the ortho-Cl in the aniline ring. The dihedral angle between the two benzene rings is 74.3 (1)°. An intra-molecular N-H⋯Cl hydrogen bond occurs. In the crystal, pairs of N-H⋯O hydrogen bonds link the mol-ecules into dimers.

The title Schiff base, C(14)H(10)BrClN(2)O(2), exists in a trans configuration with respect to the C=N bond and the dihedral angle between the two benzene rings is 0.8 (2)°. There is an intra-molecular O-H⋯N hydrogen bond in the mol-ecule, which generates an S(6) loop. In the crystal, inter-molecular N-H⋯O hydrogen bonds link adjacent mol-ecules into extended chains propagating along the c-axis...

In the title compound C13H10ClN3O3S, the benzoyl group maintains its trans conformation against the thiono group about the C-N bond and the intra-molecular hydrogen bond between the benzoyl O atom and thio-amide H atom. In the crystal, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules, forming chains along the b-axis direction. In addition, C-H⋯π inter-actions occur between a phenyl H atom and...

The title compound, C(22)H(30)N(4)O(2), has a crystallographic inversion center located at the mid-point of the N-N single bond. Apart from the four ethyl C atoms, the non-H atoms are nearly coplanar with a mean deviation of 0.0596 (2) Å. An intra-molecular O-H⋯N hydrogen bond occurs. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into layers parallel to (100).

The title compound, C(14)H(9)Cl(3)N(2)OS, has bond lengths and angles which are quite typical for thio-urea compounds of this class. The mol-ecule exists in the solid state in its thione form with typical thio-urea C=S and C=O bond lengths, as well as shortened C-N bonds. An intra-molecular N-H⋯O hydrogen bond stabilizes the mol-ecular conformation. Inter-molecular N-H⋯S hydrogen bonds link the...

The title compound, C(4)H(3)BrO(4), was obtained from a solution of meso-2,3-dibromo-succinic acid and vanadium(IV) oxide. The crystals are isostructural with chloro-maleic acid and the mol-ecule has two geometrically different carboxyl groups, one of which has delocalized C-O bonds and is essentially coplanar with the olefinic bond plane [give dihedral angle 15.08 (16)°], whereas the other has...

In the title compound, C(12)H(12)N(2)O, the aromatic rings at either ends of the -CH(2)-NH- link are twisted by 68.79 (7)°. In the crystal, the hy-droxy substituent is a hydrogen-bond donor to the N atom of the pyridine ring of an adjacent mol-ecule, and the hydrogen bond generates a chain along the b axis; it is also a hydrogen-bond acceptor to the amino group of another adjacent mol-ecule. Th...

In the title compound, C(14)H(9)Br(2)N(3)O(4)·CH(3)OH, the Schiff base mol-ecule adopts an E geometry with respect to the C=N bond and the benzene rings are oriented at a dihedral angle of 45.3 (2)°. An intra-molecular O-H⋯N hydrogen bond helps to establish the conformation. In the crystal, the methanol solvent mol-ecule is linked to the Schiff base mol-ecule through an O-H⋯O hydrogen bond and ...