Crystal structure of poly[tetra-μ-chlorido-tetra-chlorido-bis-(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' )tetra-copper(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 ortho-rhom-bic space group F dd 2. 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 inter-actions.