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The title compound, [Cu 4 Br 4 (C 21 H 22 Br 2 N 4 ) 4 ], features a macrocyclic Cu 4   L   4  ring system in which each Cu I  atom is coordinated by one bromide ion and two N atoms from two 2,2′-dimethyl-1,1′-[2,2-bis­(bromo­meth­yl)propane-1,3-di­yl]di(1 H -benzimidazole) ( L ) ligands in a distorted trigonal–planar geometry. The  L  ligands adopt either a  cis  or  trans  configuration. The asymmetric unit contains one half-mol­ecule with the center of the macrocycle located on a crystallographic center of inversion. Each bromide ion binds to a Cu I  atom in a terminal mode and is oriented outside the ring. The macrocycles are inter­connected into a two-dimensional network by π–π inter­actions between benzimid­azole groups from different rings [centroid–centroid distance = 3.803 (5) Å.

acta crystallographica. section e

cyclo-Tetrakis{μ-2,2′-dimethyl-1,1′-[2,2-bis(bromomethyl)propane-1,3-diyl]di(1H-benzimidazole)-κ2N3:N3′}tetrakis[bromidocopper(I)]