Cyclo-Tetrakis{μ-2,2′-dimethyl-1,1′-[2,2-bis-(bromomethyl) propane-1,3-diyl]di(1H-benzimidazole)-κ ² N ³:N ^3′}tetra-kis-[bromidocopper(I)]

The title compound, [Cu ₄Br ₄(C ₂₁H ₂₂Br ₂N ₄) ₄], features a macrocyclic Cu ₄L 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-(bromo-meth-yl)propane-1,3-di-yl]di(1H-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-mol-ecule 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 inter-connected into a two-dimensional network by π-π inter-actions between benzimid-azole groups from different rings [centroid-centroid distance = 3.803 (5) Å.