Vinola Z. Rodrigues

N,N'-Bis(3-methyl-phen-yl)propane-diamide.

The molecular structure of the title compound, C17H18N2O2, is symmetrical around the central C atom. The two halves of the molecule are related by a twofold rotation axis. In each half of the molecule, the structure is stabilized by intramolecular C—H⋯O hydrogen bonds. Furthermore, each amide group is almost coplanar with the adjacent benzene ring [dihedral angle is 9.2 (2)°]. The planes of the amide groups are inclined at an angle of 68.5 (1)°, while the two benzene rings make a dihedral angle of 70.40 (3)°. In the crystal, molecules are linked by intermolecular N—H⋯O hydrogen bonds into chains running along the c axis. Neighbouring chains are weakly coupled by π–π stacking interactions [centroid–centroid distance = 3.7952 (8) Å].

N-(2,3-Dimethylphenyl)-2-methylbenzamide

In the title molecule, C16H17NO, the N—H and C=O groups are in the antiperiplanar conformation that has been observed in related compounds. Furthermore, the conformation of the C=O group with respect to the methyl substituent in the 2-methylphenyl ring is syn, as has also been observed in related structures. The amide group makes dihedral angles of 50.3 (3) and 64.6 (3)° with the 2-methylphenyl and 2,6-dimethylphenyl rings, respectively, while the angle between the planes of the two rings is 14.26 (7)°. The molecules are packed into chains via N—H⋯O hydrogen bonds. An intramolecular C—H⋯O hydrogen bond is also observed.

N,N′-Diphenyl­suberamide

In the title compound (systematic name: N,N′-diphenyloctanediamide), C20H24N2O2, the two phenyl rings make an interplanar angle of 76.5 (2)°. The crystal structure is stabilized by intermolecular N—H⋯O hydrogen bonds, which link the molecules into chains running along the b axis. The crystal studied was non-merohedrally twinned, the fractional contribution of the minor twin component being 0.203 (2).

N,N'-Bis(4-chloro-phenyl-sulfon-yl)-adipamide.

In the title compound, C18H18Cl2N2O6S2, the asymmetric unit contains half a molecule with a center of symmetry at the mid-point of the central C—C bond. The dihedral angle between the benzene ring and the SO2—NH—C(O) segment in the two halves of the molecule is 83.5 (2)°. In the crystal, N—H⋯O(S) intermolecular hydrogen bonds link the molecules into infinite chains running along the c axis. The O atom involved in the hydrogen bond has a longer S—O bond than the other O atom bonded to S [1.403 (4) versus 1.361 (4) Å].

4-Chloro-N-(2,4-dimethylphenyl)-2-methylbenzenesulfonamide

In the title compound, C15H16ClNO2S, the C—SO2—NH—C torsion angle is 67.45 (17)°. The two aromatic rings are tilted relative to each other by 44.5 (1)°. The crystal structure features inversion-related dimers linked by pairs of N—H⋯O hydrogen bonds..

N,N'-Bis[(2-methyl-phenyl)sulfon-yl]adipamide.

The asymmetric unit of the title compound, C20H24N2O6S2, comprises one half-molecule, the remaining portion being generated via an inversion centre. The dihedral angle between the plane of the benzene ring and the SO2—NH—C(O)—C—C segment is 89.9 (1)°. In the crystal, intermolecular N—H⋯O(S) hydrogen bonds link the molecules into infinite chains in [101].

N,N′-Bis(3-chloro­phen­yl)malonamide

The asymmetric unit of the title compound, C15H12Cl2N2O2, contains two independent molecules. In both independent molecules, the N—H bond in one of the amide fragments is anti to the meta-chloro group of the adjacent benzene ring and that in the other amide group is syn to the other meta-chloro group. Furthermore, in both molecules, each amide group is almost coplanar with the adjacent phenyl ring, making dihedral angles of 10.5 (2) and 8.7 (2)° in one molecule and 9.0 (2) and 9.6 (2)° in the other. The planes of the amide groups are inclined at dihedral angles of 83.4 (1) and 87.4 (1)° in the two molecules. In the crystal, molecules are linked into a chain by intermolecular N—H⋯O hydrogen bonds.

4-Chloro-N-phenyl-benzamide.

In the title compound, C13H10ClNO, the dihedral angle between the two benzene rings is 59.6 (1)°. The crystal structure features N—H⋯O hydrogen bonds, which link the molecules into C(4) chains running along the a axis.

N,N'-Bis(2-chloro-phen-yl)propane-diamide.

The crystal structure of the title compound, C15H12Cl2N2O2, contains three intramolecular hydrogen bonds; two C—H⋯O and a nonclassical N—H⋯Cl. The structure is further stabilized by intermolecular N—H⋯O hydrogen bonds and C—H⋯π interactions, resulting in a three-dimensional network. The two benzene rings make an interplanar angle of 58.0 (1)°.

4-Chloro-N-(2-chloro­phen­yl)-2-methyl­benzene­sulfonamide

In the crystal structure of the title compound, C13H11Cl2NO2S, the conformations of the N—C bond in the C—SO2—NH—C segment are trans and gauche with respect to the S=O bonds. The C—S(O2)—N(H)—C torsion angle is 74.8 (4)°, indicating that the molecule is bent at the S atom. In the crystal structure, inversion dimers linked by pairs of N—H⋯O hydrogen bonds occur. An intramolecular N—H⋯Cl interaction is also present.