Crystal structure of catena -poly[[[bis-(1-benzyl-imidazole-κ N )copper(II)]-μ-sulfato-κ 2 O : O '-[tetra-kis-(1-benzyl-imidazole-κ N )copper(II)]-μ-sulfato-κ 2 O : O '] N , N -di-methyl-formamide disolvate dihydrate].

The title one-dimensional copper(II) coordination polymer, {[Cu(SO 4 )(C 10 H 10 N 2 ) 3 ]·C 3 H 7 NO·H 2 O} n or {[Cu(bzi) 3 (μ-O 2 SO 2 )]·H 2 O·DMF} n (bzi = 1-benz-yl-imidazole, C 10 H 10 N 2 ; DMF = N , N -di-methyl-formamide, C 3 H 7 NO), is constructed by monodentate bzi ligands and bridging sulfate anions, leading to chains propagating parallel to the c axis. Within a chain, there are two crystallographic independent Cu II ions, each with site symmetry , which form [CuN 2 O 2 ] and [CuN 4 O 2 ] polyhedra alternating along the chain direction. The crystal structure is consolidated by weak hydrogen-bonding, C-H⋯π and π-π inter-actions, leading to the formation of a three-dimensional supra-molecular network.