In the structure of the mononuclear title complex, [Cu(C21H16NO2S)2], the CuII atom, which lies on an inversion centre, displays approximately square‐planar coordination geometry. The bidentate ligands coordinate through their phenolate O and imine N atoms in a mutually trans orientation. The structure is stabilized by a three‐dimensional network of C—H⋯O hydrogen bonds.

Key indicators: single-crystal X-ray study; T = 150 K; mean (C-C) = 0.005 Å; disorder in main residue; R factor = 0.046; wR factor = 0.125; data-to-parameter ratio = 14.0.The title Schiff base compound, C 25 H 19 NO 2 S, crystallizes in a statistically disordered structure comprising keto and enol tautomeric forms. In the enol form, the benzenoid arrangment is promoted by a strong intramolecular O-HÁ Á ÁN hydrogen bond and adopts an E conformation about the imine bond. In the keto form there is an intramolecular N-HÁ Á ÁO hydrogen bond. In the crystal, an extended network of C-HÁ Á ÁO hydrogen bonds stabilizes columns parallel to the c axis, forming large voids (there are four cavities of 108 Å 3 per unit cell) with highly disordered residual electron density. The SQUEEZE procedure in PLATON [Spek (2009). Acta Cryst. D65, 148-155] was used to eliminate the contribution of this electron density from the intensity data, and the solvent-free model was employed for the final refinement. The contribution of this undetermined solvent was ignored in the calculation of the unit-cell characteristics. Related literature

The title Schiff base compound, C22H19NO2S, crystallized with two independent mol­ecules (A and B) in the asymmetric unit. Both mol­ecules have an E conformation about the C=N bond. The two mol­ecules differ in the orientation of the aromatic rings with respect to each other. The outer 4-meth­oxy­benzene ring is inclined to the central benzene ring and the outer 4-acetyl­benzene ring by 1.80 (19) and 63.73 (19)°, respectively, in mol­ecule A, and by 6.72 (18) and 68.53 (19)°, respectively, in mol­ecule B. The two outer benzene rings are inclined to one another by 63.77 (18) and 63.19 (18)° in mol­ecules A and B, respectively. In the crystal, the individual mol­ecules stack in columns along [010], and are linked by a number of C—H⋯π inter­actions, forming slabs lying parallel to (001).

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