with a propeller-shaped dinuclear copper complex

C2oH4«Br4Cu2N40io, monoclinic, P12i/cl (no. 14), a = 11.3039(7) k,b= 14.7663(9) A, c = 11.3239(7) A, β = 108.194(5)°, V= 1795.7 A3, Z = 2, R&(F) = 0.032, wRretfF2) = 0.085, T= 293 K. Source of material Betaine monohydrate (C5H11NO2 - H2O) and copper dibromide (CuBr2) were dissolved in a non-stoichiometric ratio of 4:3 in pure water under stirring at about 320 K. By slow evaporation of the solvent at 293 K green crystals emerged. All starting materials were commercial products. Experimental details The isotropic displacement parameters of H1W1 and H2W1, be- longing to the water molecule, were fixed at a constant value. Discussion