The crystal structure of the title compound, copper(II) diselenium(IV) pentoxide [Meunier, Svensson & Carpy, (1976). Acta Cryst. B32, 2664–2667], has been reinvestigated and confirmed to much higher precision, and anisotropic displacement parameters has been refined. The structure consists of CuO4 planar squares and Se2O5E2 (E = lone pair) dimers. The Cu atom has site symmetry 1̄ and one O atom has site symmetry 2.
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Becker et al. (2006) studied this question.
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