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In the title compound, [Cu(C 7 H 3 Cl 2 O 2 ) 2 ]  n  , the Cu II  atom lies on a centre of inversion and adopts a [4+2] coordination mode, with two long axial Cu—Cl coordinative bonds complementing four Cu—O bonds from two 2,4-dichloro-6-formyl­phenolate ligands in a distorted square plane. π–π stacking inter­actions are also formed between neighbouring aromatic rings, with a centroid–centroid separation of 3.624 (2) Å.

acta crystallographica. section e

catena-Poly[copper(II)-bis(μ-2,4-dichloro-6-formylphenolato)-κ3O,O′:Cl4;κ3Cl4:O,O′]