학술논문
The Crystal Structures of Mn(ReO4)2·2H2O and of the Anhydrous PerrhenatesM(ReO4)2of Divalent Manganese, Cobalt, Nickel, and Zinc
Document Type
Article
Author
Source
Journal of Solid State Chemistry; July 1998, Vol. 138 Issue: 2 p232-237, 6p
Subject
Language
ISSN
00224596; 1095726X
Abstract
Mn(ReO4)2·2H2O (manganese(II)-perrhenate dihydrate) is analyzed by X-ray single-crystal diffraction and TG/DTA. Space groupC2/m,a=14.71(1) Å,b=5.861(6) Å,c=5.537(5) Å,β=110.87(4)°,Z=2, calculated densityDx=4.40 g/cm3. Chains of interconnected ReO4–tetrahedra and MnO4(OH2)2–octahedra run parallel [0 1 0]. The AC-susceptibility (μeff=5.7μB) is consistent with divalent Mn and heptavalent Re. Dehydration takes place in a single step at 150°C. Decomposition starts at 820°C. The dehydration product Mn(ReO4)2and the isotypic anhydrous perrhenates of Co, Ni, Zn crystallize in space groupP3,Z=1;aranges from 5.67 (Ni) to 5.86 Å (Mn),cranges from 6.07 (Mn) to 6.17 Å (Zn),Dx(g/cm3)=5.11 (Mn), 5.36 (Co), 5.44 (Ni), 5.33 (Zn). The structure is topologically equivalent to that ofβ-Zr(MoO4)2.M2+O6–octahedra are linked by ReO4–tetrahedra to form layers which are not interconnected.