Journal
SOLID STATE SCIENCES
Volume 114, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2021.106576
Keywords
Halides; Perrhenates; Matlockite derivatives; Litharge; Crystal structure
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Two new layered barium perrhenate halides, BaX(ReO4) (X = Cl and Br), were synthesized and their structures were studied. These compounds exhibit similar structural features to previously known compounds, while showing strong relationships to other coordinating ions.
Two new layered barium perrhenate halides, BaX(ReO4) (X = Cl and Br), were prepared and their structures were refined from single-crystal and powder data, respectively. Both compounds are isostructural to the previously reported BaCl(MnO4), exhibiting a matlockite (PbFCl)-derived motif. The structure of previously reported PbBr (ReO4) was also refined, in order to obtain a complete data set; it is similar to PbCl(ReO4). The structures of Ba and Pb compounds correspond to the centro- and non-centrosymmetric versions (pseudo-polymorphs) of the same motif corresponding to the alternation of [M2X2](2+) litharge-derived slabs and double sheets of perrhenate anions. Strong relationships exist to the structures of LnX(TO4) (X = Cl, Br; T = Mo, W) which are monoclinically distorted versions of the orthorhombic permanganates and perrhenates. Crystal chemistry and further perspectives of the compounds with litharge slabs constructed of Cl, Br, and I-centered tetrahedra are discussed.
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