Synthesis and structure determination of copper perrhenate, CuReO4

摘要

Copper(I) perrhenate, CuReO4, has been synthesized as a single-phase sample in sealed silica tubes at 500-800 degrees C, and its structure was determined for the first time by single-crystal X-ray diffraction. CuReO4 forms a new structure type derived from the diamond -structure and crystallizes in space group I4(1)cd with lattice parameters a = 13.6965(5) angstrom and c = 7.7729(5) angstrom, Z = 16 (rotation method data acquisition using omega and phi scans, R-1 = 0.0191, wR(2) = 0.0403). Cu and Re atoms are tetrahedrally coordinated by 0 atoms, these tetrahedra are corner-shared, forming spirally twisted rings of 4-6-8-10-MeO4 like SixOy-rings in some silicon dioxide modifications or aluminosilicates. According to low-temperature powder X-ray diffraction and differential thermal analysis, CuReO4 shows no phase transition down to 80 K and up to its melting point, 703 K. (C) 2006 Elsevier Inc. All rights reserved.