{2,2′-[Cyclo­hexane-1,2-diylbis(nitrilo­methanyl­ylidene)]diphenolato}copper(II)

The title compound, [Cu(C₂₀H₂₀N₂O₂)], crystallizes with two independent mol­ecules in the asymmetric unit. In each mol­ecule, the Cu^II atom occupies the tetra­dentate N₂O₂ cavity of the salen-type Schiff base ligand, adopting a distorted square-planar geometry with r.m.s. deviations of the coordin­ating atoms of 0.0522 (2) and 0.1128 (4) Å. No hydrogen bonds or π–π stacking inter­action are observed.

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.

(Z)-4-[(3-Aminona­phthalen-2-yl­amino)(phen­yl)methyl­idene]-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one

The mol­ecule of the title compound, C₂₇H₂₂N₄O, assumes a non-planar conformation in which the pyrazolone ring forms dihedral angles of 12.73 (11), 65.17 (6) and 49.82 (6)°, respectively, with the two benzene rings and the naphthalene ring system. In the crystal, pairs of mol­ecules are linked by inter­molecular N—H...N hydrogen bonds, forming dimers. The secondary amino group is involved in an intra­molecular N—H...O hydrogen bond.