Bis-biuret-copper(II) dichloride, Cu(NH2CONHCONH2)2CI2, forms blue-green crystals when an aqueous alcoholic solution of copper(II) chloride and biuret is slowly cooled. The slructure was solved by standard Fourier methods and refined by least-squares with anisotropic thermal parameters (R = 0.091). Hydrogen atoms were located in a three-dimensional (Fo-Fc) synthesis. The biuret molecules act as bidentate chelates via their oxygen atoms. The four oxygen atoms in the centrosymmetrical [Cu(NHzCONH-2+ CONH2)2] ion form a square about the copper atom, whose elongated coordination octahedron is completed by the two chloride ions (Cu-O = 1"94/1, Cu-CI = 2.96/~). The structure analysis was complicated by a space group ambiguity affecting only the light atoms. This ambiguity could not be resolved on the basis of the crystallographic data alone but only by invoking criteria of molecular geometry to eliminate a non-centrosymmetrical alternative to the actual structure.153
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