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Crystals of [Cu2{(CH3)2NCH2CH2N(CH3)2}2(OH)2]Br2 are orthorhombic, space group Fddd, with eight formula units in a unit cell of dimensions a= 17.072, b= 18.482 and c= 12-825, all + 0.005 A. The structure was determined by three-dimensional Patterson syntheses from data taken with Nifiltered Cu K0c radiation using the equi-inclination, multiple-film Weissenberg technique. The formula unit was found to have a dimeric structure with a Cu-Cu distance of 3.000 A. Anisotropic refinement was carried out by the method of block-diagonal least-squares to obtain a final R index of 0.082.

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