Crystal structure of poly[tetra-μ-chlorido-tetra­chlorido­bis­(μ(3)-4,4′-bi-1,2,4-triazole-κ(3) N (1):N (2):N (1′))(μ-4,4′-bi-1,2,4-triazole-κ(3) N (1):N (1′))tetra­copper(II)]

The title Cu(2+)–chloride coordination polymer with the 4,4′-bi-1,2,4-triazole ligand (btr), [Cu(4)Cl(8)(C(4)H(6)N(6))(3)](n), crystallizes in the non-centrosymmetric ortho­rhom­bic space group Fdd2. The two independent Cu(2+) cations adopt distorted square-pyramidal geometries with {Cl(2)N(2)+Cl} coordination polyhedra. The metal atoms are bridged by μ-Cl anions forming left- and right-handed helical chains of sequence [–(μ-Cl)CuCl–](n) along the c-axis direction. In the perpendicular directions, the btr ligands act in μ- and μ (3)– coordination modes in a 2:3 ratio. The μ-btr bridges connect neighboring helices of the same handedness, whereas the μ (3)-btr ligands link the helices of opposite handedness, leading to a racemic three-dimensional framework. The structure is consolidated by weak C—H⋯Cl and C—H⋯N inter­actions.