4-Bromo-anilinium hydrogen phthalate.

In the anion of the title compound, C(6)H(7)BrN(+)·C(8)H(5)O(4) (-), the dihedral angles formed by the benzene ring and the mean planes of the -COOH and -COO(-) groups are 20.6 (3) and 83.2 (3)°, respectively.

Butane-1,4-diaminium bis-[3,4,5,6-tetra-chloro-2-(meth-oxy-carbon-yl)benzoate].

In the title salt, C(4)H(14)N(2) (+)·2C(9)H(3)Cl(4)O(4) (-), the cation lies on an inversion center. In the anion, the mean planes of meth-oxy-carbonyl and carboxyl-ate groups form dihedral angles of 64.9 (3) and 58.

Penta-aqua-bis[4-(2-hydroxy-benzyl-idene-amino)benzene-sulfonato]lead(II).

In the structure of the title compound, [Pb(C(13)H(10)NO(4)S)(2)(H(2)O)(5)], two S-O bonds and one C-N bond have lengths of 1.421 (9), 1.425 (8) and 1.

Ethane-1,2-diaminium 3,4,5,6-tetra-bromo-2-(methoxy-carbon-yl)benzoate methanol solvate.

In the title compound, C(2)H(10)N(2) (2+)·2C(9)H(3)Br(4)O(4) (-)·CH(4)O, the N atoms of the ethane-1,2-diamine mol-ecule are protonated. The crystal structure is stabilized by N-H⋯O hydrogen bonds between the ethane-1,2-diaminium cations and 3,4,5,6-tetra-bromo-2-(methoxy-carbon-yl)bromo-benzoate anions, and by O-H⋯O and N-H⋯O hydrogen bonds between the methanol solvate and both the cation and the anion. In addition, the crystal structure exhibits a C-Br⋯O halogen bond [3.

2-Chloro-N-[4-(dimethyl-amino)benzyl-idene]aniline.

In the title mol-ecule, C(15)H(15)ClN(2), the dihedral angle between the aromatic is 64.1 (2)°.

tert-Butyl-ammonium 2,3,4,5-tetra-chloro-6-methoxy-carbonyl-benzoate.

In the title compound, C(4)H(12)N(+)·C(9)H(3)Cl(4)O(4) (-), the benzene ring forms dihedral angles of 62.4 (2) and 64.0 (3)°, respectively, with the essentially planar methoxy-carbonyl and carboxyl-ate groups.

Hexaaqua-nickel(II) bis-[4-(2-hydroxy-benzyl-ideneamino)benzene-sulfonate].

In the title compound, [Ni(H(2)O)(6)](C((C(13) )H(10)NO(4)S)(2), the nickel(II) atom, lying on a center of symmetry, is six-coordinated by six aqua O-atom donors. The dihedral angle between the two benzene rings is 33.1 (3)°.

4-Amino-2-methyl-quinoline monohydrate.

The crystal structure of the title compound, C(10)H(10)N(2)·H(2)O, is stabilized by inter-molecular O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds.

2,2'-(1,1'-Azinodiethyl-idyne)diphenol.

In the title mol-ecule, C(16)H(16)N(2)O(2), the C-N bond lengths are 1.295 (5) and 1.300 (5) Å, which suggests that they are double bonds.

N'-[1-(2-Hydroxy-phen-yl)ethyl-idene]benzene-sulfonohydrazide.

In the title compound, C(14)H(14)N(2)O(3)S, the conformation is stabilized by an intra-moleclar O-H⋯N hydrogen bond and the dihedral angle between the aromatic ring planes is 79.55 (18)°. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds lead to [100] chains of mol-ecules.

Hexaaqua-cadmium(II) bis-[4-(2-hydroxy-benzyl-ideneamino)benzene-sulfonate] dihydrate.

In the title compound, [Cd(H(2)O)(6)](C(13)H(10)NO(4)S)(2)·2H(2)O, the Cd atom (site symmetry ) adopts a regular octa-hedral coordination and the anion is stabilized by an intra-molecular O-H⋯N hydrogen bond. O-H⋯O hydrogen bonds involving the coordinated and uncoordinated water mol-ecules lead to a three-dimensional network.