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New Ba M 2 (SeO 3 ) 3 · n H 2 O ( M = Co, Ni, Mn, Mg; n ≈ 3) Zemannite‐Type Frameworks: Single‐Crystal Structures of BaCo 2 (SeO 3 ) 3 ·3H 2 O, BaMn 2 (SeO 3 ) 3 ·3H 2 O and BaMg 2 (SeO 3 ) 3 ·3H 2 O
Author(s) -
Johnston Magnus G.,
Harrison William T. A.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100344
Subject(s) - isostructural , chemistry , octahedron , crystallography , molecule , barium , chalcogen , metal , ion , hydrothermal circulation , inorganic chemistry , crystal structure , organic chemistry , seismology , geology
The syntheses and characterisation of a new family of isostructural mixed‐metal selenites based on the zemannite‐type framework are described. These Ba M 2 (SeO 3 ) 3 · 3H 2 O phases are built up from three‐dimensional networks of M O 6 ( M = Co, Ni, Mn, Mg) octahedra and SeO 3 pyramids. The octahedral groups form isolated M 2 O 9 face‐sharing pairs, which are linked by the selenite anions into a three‐dimensional anionic framework. The framework encapsulates one‐dimensional 12‐ring channels occupied by the barium cations and water molecules. There are two types of channels: in one, the cations and water molecules are well ordered, and the channels are fully occupied; in the other, the same species are disordered, and the channels are partially occupied. There is little if any evidence of zeolitic reversible de/rehydration and cation ion‐exchange behaviour for these materials.