학술논문
Sr[ReO4 ]2 : The First Single Crystals of an Anhydrous Alkaline‐Earth Metal Meta‐Perrhenate.
Document Type
Article
Source
Subject
*SINGLE crystals
*METALS
*STRONTIUM
*ALKALINE earth metals
*CRYSTAL structure
*X-ray diffraction
*TETRAHEDRAL molecules
*SPACE groups
*LATTICE constants
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Language
ISSN
0044-2313
Abstract
Colorless single crystals of Sr[ReO4]2 were obtained from halide melts at 1123 K in open corundum crucibles. X‐ray diffraction revealed that Sr[ReO4]2 crystallizes in the monoclinic space group P21/n with the lattice parameters a = 627.31(4) pm, b = 1004.56(7) pm, c = 1271.25(9) pm and β = 97.118(3)° for Z = 4. The crystal structure contains a unique Sr2+‐cation site surrounded by eight crystallographically different oxygen atoms forming distorted bicapped trigonal prisms. All corners of these [SrO8]14– polyhedra (d(Sr–O) = 259–268 pm) are shared with tetrahedral meta‐perrhenate units [ReO4]– (d(Re–O) = 166–173 pm) formed from two crystallographically different Re7+ cations surrounded by four O2– anions each, building up the three‐dimensional mosaic‐like structure of Sr[ReO4]2. Single‐crystal Raman data confirm the presence of two different kinds of symmetry‐free meta‐perrhenate units [ReO4]– and match well with results known from literature. [ABSTRACT FROM AUTHOR]