{4,4′-Dimethyl-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato}copper(II) monohydrate

The asymmetric unit of the title compound, [Cu(C₂₁H₂₄N₂O₂)]·H₂O, comprises half of a Schiff base complex and half of a water mol­ecule. The whole compound is generated by crystallographic twofold rotation symmetry. The geometry around the Cu^II atom, located on a twofold axis, is distorted square-planar, which is supported by the N₂O₂ donor atoms of the coordinating Schiff base ligand. The dihedral angle between the symmetry-related benzene rings is 47.5 (4)°. In the crystal, the water mol­ecule that is hydrogen bonded to the coordinated O atoms links the mol­ecules via O—H...O inter­actions into chains parallel to [001]. The crystal structure is further stabilized by C—H...π inter­actions, and by π–π inter­actions involving inversion-related chelate rings [centroid–centroid distance = 3.480 (4) Å].

An ortho­rhom­bic polymorph of 2-(1,3-benzothia­zol-2-yl)-6-eth­oxy­phenol

In the title mol­ecule, C₁₅H₁₃NO₂S, an intra­molecular O—H...N hydrogen bond forms an S(6) ring motif. The benzothia­zole ring system and the benzene ring form a dihedral angle of 8.9 (3) Å. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming chains along the b axis. In addition, π–π inter­actions [centroid–centroid distances = 3.772 (4) and 3.879 (4) Å] are observed.

4-Bromo-2-[(E)-(2-{2-[(2-{[(E)-5-bromo-2-hy­droxy­benzyl­idene]amino}­phen­yl)sulfan­yl]ethyl­sulfan­yl}phen­yl)imino­meth­yl]phenol

The asymmetric unit of the title compound, C₂₈H₂₂Br₂N₂O₂S₂, comprises half of a Schiff base ligand, the whole mol­ecule being generated by a crystallographic inversion center located at the mid-point of the C—C bond of the central methyl­ene segment. Intra­molecular O—H...N and O—H...S hydrogen bonds make S(6) and S(5) ring motifs, respectively. In the crystal, there are no significant inter­molecular inter­actions.