4-Bromo-2-meth­oxy-6-(1-phenyl-1H-benzimidazol-2-yl)phenol

The title compound, C₂₀H₁₅BrN₂O₂, crystallized with three independent molecules in the asymmetric unit. Intramolecular O—H...N hydrogen bonds induce coplanarity of the substituted benzene ring and the benzimidazole ring, with mean deviations from the planes of 0.0931 (10), 0.0448 (10) and 0.0083 (11) Å in the three mol­ecules.

Bis[μ-N′-(5-bromo-3-meth­oxy-2-oxido­benzyl­idene)-2-hydroxybenzohydra­zidato]bis[(N,N-dimethyl­formamide)­copper(II)]

The title compound, [Cu₂(C₁₅H₁₁BrN₂O₄)₂(C₃H₇NO)₂], is derived from the reaction of N′-(5-bromo-2-hy­droxy-3-meth­oxy­benzyl­idene)-2-hy­droxy­benzohydrazide and copper nitrate in a dimethyl­formamide solution in the presence of sodium hydroxide. The compound can be regarded as a binuclear centrosymmetric complex. In the crystal, the Cu^II atom is fivefold surrounded and adopts a distorted square-pyramidal coordination environment. An intra­molecular O—H...N hydrogen bond stabilizes the mol­ecular conformation.

(E)-N′-(5-Bromo-2-hy­droxy-3-meth­oxy­benzyl­idene)-2-hy­droxy­benzohydrazide monohydrate

The organic molecule of the title hydrate, C₁₅H₁₃BrN₂O₄·H₂O, is roughly planar, with a mean deviation of 0.0939 (2) Å. The dihedral angle between the two aromatic rings is 8.2 (3)°. Intra­molecular O—H...N and O—H...O hydrogen bonds are observed. In the crystal, N—H...O(water) and O(water)—H...O hydrogen bonds lead to a three-dimensional network.