Crystal structure of bis(N-methylethylenediammonium) hexabromodicuprate(I)

The crystal structure of the title compound (C3H12N2)2Cu2Br6, is monoclinic, space group P21/n, with lattice constants a=8.222(2), b=11.214(2), c=10.646(2) Å, β=91.97(1)° and V=981.0(3) Å3. The structure contains anionic Cu2Br62− dimers and N-methylethylenediammonium (henceforth MEDA2+) cations. The centrosymmetric dimer units are composed of two edge-shared CuBr4 tetrahedra, with bridging Cu–Br distances 0.08 Å longer than the terminal distances. A pair of MEDA2+ cations hydrogen bond to each dimer via two of the –NH3+ hydrogen atoms and one of the –NH2+- hydrogen atoms. Additional hydrogen bonding between the cations and anions tie the structure together in a complex supramolecular network.