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

In the title Schiff base complex, [Cu(C₁₉H₁₈Cl₂N₂O₂)], the Cu^II ion is coordinated in a distorted square-planar environment by two N atoms and two O atoms of the tetra­dentate ligand. The dihedral angle between the benzene rings is 36.86 (14)°. In the crystal, mol­ecules are linked into inversion dimers by pairs of weak C—H...O hydrogen bonds. In addition, π–π [centroid–centroid distance = 3.7279 (16) Å] and weak C—H...π inter­actions are observed.

{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].

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

The asymmetric unit of the title compound, [Cu(C₂₁H₂₄N₂O₄)]·H₂O, comprises half of a Schiff base complex and a water mol­ecule. The Cu^II atom, water mol­ecule and one C atom of the central propyl­ene segment are located on a twofold rotation axis. The geometry around the Cu^II atom is distorted square-planar, supported by the N₂O₂ donor atoms of the coordinating ligand. The dihedral angle between the symmetry-related benzene rings is 42.56 (19)°. In the crystal, O—H...O hydrogen bonds involving the water mol­ecule make an R₂¹(6) ring motif. Complex mol­ecules are linked into a chain along the c axis via C—H...O inter­actions.