The asymmetric unit of the title polymeric mononuclear CuII complex, [Cu(C2N3)2(NH3)2]n, contains one half-mol­ecule, the complex being completed through inversion symmetry, with the CuII atom situated on the centre of symmetry. The coordination polyhedron around CuII is a Jahn–Teller-distorted [CuN6] octa­hedron. The terminal N atoms of two dicyanamide ligands and two ammine ligands form an approximate square plane, with N—Cu—N bite angles of 89.72 (5) and 90.28 (5)°. The coordination polyhedron is completed in the axial positions by the central amide-type N atoms of two additional dicyanamide ligands, with an elongated Cu—N distance of 2.548 (1) Å. In turn, each of the four dicyanamide ligands, acting as bidentate, link the CuII ions into a two-dimensional polymeric structure parallel to (100). The ammine H atoms are involved in inter­molecular hydrogen bonding with the free terminal N atoms of neighbouring dicyanamide ligands, yielding a three-dimensional network.

In the title compound, C14H12ClNO, the two aromatic rings are almost coplanar, making a dihedral angle of 4.08 (18)°. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into infinite chains running along the a axis.

In the title compound, C15H14ClNO, the dihedral angle between the benzoyl and the aniline rings is 3.30 (18)°. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into chains running along the a axis.

In the mol­ecular structure of the title compound, C15H14ClNO, the amide group forms dihedral angles of 15.8 (2) and 27.2 (2)°, respectively, with the benzoyl and aniline rings, while the angle between the benzoyl and aniline rings is 11.5 (1)°. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which give rise to infinite chains running along the c axis.

In the structure of the title compound, C14H12ClNO, the ortho-Cl atom in the benzoyl ring is positioned syn to the C=O bond, while the meta-methyl group in the aniline ring is positioned anti to the N—H bond. The amide group forms dihedral angles of 60.1 (1) and 22.0 (1)°, respectively, with the benzoyl and aniline rings, while the angle between these rings is 38.7 (1)°. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which give rise to infinite chains running along the c axis.

In the title compound, C15H14ClNO, the ortho- and meta-methyl substituents in the aniline ring are anti to the N—H bond. The dihedral angle between the benzoyl and aniline benzene rings is 95.0 (1)°. N—H⋯O hydrogen bonds and C—H⋯π inter­actions link the mol­ecules in the crystal structure.

The title compound, C10H7ClN2O5·H2O, crystallizes with a half-mol­ecule each of N-(2-chloro-4-nitro­phen­yl)maleamic acid (located on a mirror plane) and water (located on a twofold rotation axis) in the asymmetric unit. The main mol­ecule is planar by symmetry and its conformation is stabilized by an intra­molecular O—H⋯O hydrogen bond. In the crystal, N—H⋯O and O—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.

In the title compound, C13H9Cl2NO, the meta-Cl atom in the benzoyl ring is positioned anti to the C=O bond, while the ortho-Cl atom in the aniline ring is positioned syn to the N—H bond. The two aromatic rings are almost coplanar, making a dihedral angle of 4.73 (5)°. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which link the mol­ecules into chains along the b axis.

In the title compound, C16H17NO, the two aromatic rings make a dihedral angle of 5.9 (2)°, while the central amide core –NH—C(=O)– is twisted by 44.0 (3) and 47.1 (3)° out of the planes of the 2,3-dimethyl­phenyl and 2-methyl­phenyl rings, respectively. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into infinite chains running along the b axis.

In the mol­ecular structure of the title compound, C14H12ClNO, the meta-Cl atom in the benzoyl ring is positioned anti to the C=O bond, while the ortho-methyl group in the aniline ring is positioned syn to the N—H bond. The two benzene rings are nearly coplanar [dihedral angle = 3.48 (5)°]. The crystal structure is stabilized by N—H⋯O hydrogen bonds, which link the mol­ecules into chains along the b axis.

In the mol­ecular structure of the title compound, C11H10ClNO3, the conformation of the N—H bond in the amide segment is syn to the ortho-methyl group in the phenyl ring. The C=O and O—H bonds of the acid group are in the relatively rare anti position with respect to each other. This is an obvious consequence of the hydrogen bond donated to the amide carbonyl group. The central oxobutenoic acid core C(=O)—C=C—C—OH is twisted by 31.65 (6)° out of the plane of the 4-chloro-2-methyl­phenyl ring. An intra­molecular O—H⋯O hydrogen bond occurs. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into infinite chains running along the a axis.

In the title compound, C13H10ClNO, the meta-chloro group on the benzoyl ring is positioned syn to the C=O bond. The two aromatic rings make a dihedral angle of 88.5 (3)°. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into C(4) chains propagating in [010].

In the mol­ecular structure of the title compound, C14H12ClNO, the meta-Cl atom in the benzoyl ring is positioned syn to the C=O bond, while the meta-methyl group in the aniline ring is positioned anti to the N—H bond. The two aromatic rings make a dihedral angle of 77.4 (1)°. In the crystal, the molecules are linked by N—H⋯O hydrogen bonds, forming C(4) chains propagating in [010].

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.

In the title compound, C16H17NO, the dihedral angle between the two benzene rings is 16.6 (1)°. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds, which link the mol­ecules into chains running along the c axis.

In the title compound, C14H12ClNO, the aromatic rings make a dihedral angle of 59.25 (5)°. The methyl group is disordered over two equally occupied positions. In the crystal, N—H⋯O hydrogen bonds link the mol­ecules into infinite C(4) chains running along the a axis.

In the title compound, C14H12ClNO, the ortho-Cl atom in the benzoyl ring is positioned syn to the C=O bond. The benzoyl and aniline benzene rings are tilted relative to each other by 82.8 (1)°. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into infinite chains running along the c-axis direction.

In the title compound, C15H15NO, the two aromatic rings make a dihedral angle of 70.06 (3)°, while the central amide core –NH—C(=O)– is twisted by 30.24 (4) and 40.16 (3)° out of the planes of the 3-methyphenyl and 4-methyphenyl rings, respectively. The methyl groups are disordered over two equally occupied positions. In the crystal, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into infinite chains running along the a axis.

In the title compound, C14H12ClNO·0.5H2O, the water mol­ecule is located on a twofold axis of symmetry. The meta-Cl atom in the aniline ring is positioned anti to the N—H bond. The two benzene rings make a dihedral angle of 40.40 (11)°. The crystal structure is stabilized by inter­molecular N—H⋯O and O—H⋯O hydrogen bonds, which link the mol­ecules into chains along the a axis.

In the title compound, C14H12ClNO, the meta-methyl substituent in the aniline ring is positioned anti to the N—H bond. The dihedral angle between the rings is 12.4 (1)°. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds, which link the mol­ecules into C(4) chains running along the c-axis direction.

The asymmetric unit of the title compound, C14H12ClNO, contains two independent mol­ecules in which the dihedral angles between the two aromatic rings are 51.76 (6) and 51.48 (7)°. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds, which link the mol­ecules into chains running along the c axis.

In the mol­ecule of the title compound, C16H17NO, the two aromatic rings are almost perpendicular to each other [dihedral angle 85.90 (5)°]. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds which link the mol­ecules, forming C(4) chains running along the c axis.

The asymmetric unit of the title compound, C15H15NO, contains two independent mol­ecules, which differ in the dihedral angle between the aromatic rings [48.98 (9) and 57.48 (8)°]. The methyl groups in para positions are disordered over two equally occupied positions. An intra­molecular N—H⋯O hydrogen bond occurs. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds which link the mol­ecules into chains running along the b axis.

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].

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)°.