N′-[(Z)-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methyl­idene]-2-hy­droxy­benzohydrazide

In the title compound, C₁₉H₁₈N₄O₃, the pyrazole ring is oriented at dihedral angles of 41.12 (7) and 12.25 (10)°, respectively, with respect to the planes of the phenyl and benzene rings. Intra­molecular N—H...O and O—H...O hydrogen bonds generate seven- and six-membered S(7) and S(6) ring motifs, respectively.

17-(Pyrimidin-2-yl)-8,16-dioxa-17-aza­tetra­cyclo­[7.7.1.0^2,7.0^10,15]hepta­deca-2,4,6,10,12,14-hexa­ene

In the title compound, C₁₈H₁₃N₃O₂, the benzene rings form a dihedral angle of 78.49 (9)°. The dihedral angles between the benzene rings and the pyrimidine ring are 76.53 (10) and 27.73 (11)°. The two cis-fused six-membered heterocyclic rings adopt half-chair confirmations. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds, forming chains parallel to the b axis.

{5-Chloro-2-[(4-chloro­benzyl­idene)­amino]­phen­yl}(phen­yl)methanone

In the title compound, C₂₀H₁₃Cl₂NO, the C=N bond adopts an E conformation. The chloro-substituted rings form a dihedral angle of 11.99 (9)° with each other and form dihedral angles of 74.95 (9) and 83.26 (10)° with the unsubstituted ring. In the crystal, mol­ecules are connected into dimers by pairs of weak C—H...O hydrogen bonds and the dimers are arranged in columns parallel to the a axis.

{2-[(3-Bromo­benzyl­idene)amino]-5-chloro­phen­yl}(phen­yl)methanone

In the title compound, C₂₀H₁₃BrClNO, the azomethine double bond [C=N = 1.246 (4) Å] adopts an E conformation. The bromo- and chlorophenyl rings are inclined to one another by 13.70 (11)°, and form dihedral angles of 76.68 (10) and 74.24 (7)°, respectively, with the phenyl ring. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds to form double stranded chains propagating along the b-axis direction.

[4,4′-(Ethane-1,2-diyldinitrilo)­bis­(pent-2-en-2-olato)]copper(II) 0.25-hydrate

In the title compound, [Cu(C₁₂H₁₈N₂O₂)]·0.25H₂O, the coordination of the O,N,N′,O′-tetra­dentate ligand results in a cis-CuN₂O₂ square-planar geometry for the metal ion and the presence of two six-membered and one five-membered chelate rings. The complete complex mol­ecule is close to planar (r.m.s. deviation = 0.047 Å). The uncoordinated water mol­ecule (O-atom site symmetry 2) was modelled as half occupied. In the crystal, C—H...O_w and O_w—H...O (w = water) hydrogen bonds link the components into layers parallel to ab plane.

2-[(2-Meth­oxy­benzyl­idene)amino]­phenol

In the title compound, C₁₄H₁₃NO₂, the azomethine double bond adopts an E conformation and the benzene rings form a dihedral angle of 77.70 (7)°. In the crystal, mol­ecules are linked by O—H...N and C—H...O hydrogen bonds and arranged in a zigzag fashion, forming infinite chains parallel to the c axis, resulting in a graph-set R₂²(9) motif.