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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Azoxybenzene CeH5NONCeH5 has been classified as orthorhombic until the present. Recently obtained single-crystal data revealed Laue symmetry 2/wi, pinpointing the monoclinic system. Systematic absences uniquely indicate space group P21ja.Lattice constants obtained from rotation and zero-layer Weissenberg photographs, calibrated with a diamond crystal, are: a = 11.38 ± .01 Α β = 107.5 ± .25° b = 15.95 + .01 À Ζ = 4 c = 5.89 ± .02 À Dx = 1.29The powder data has been submitted for inclusion in the ASTM X-ray Powder Data File. Structure analysis is in progress.