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Site structures for Cu(ClO4)2 in frozen 1M HClO4 solution, derived from the MXAN two-site fit. The long axial water (left panel) or long axial perchlorate (right panel) are represented as unbound but associated. The 105° Oax1–Cu–Oeq angular bend in the perchlorate site is very evident, and the copper is 0.5 Å above the mean O4 equatorial plane.
