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- Title
Two-dimensional zeolite-like network in the new caesium copper aluminate Cs<sub>2</sub>CuAl<sub>4</sub>O<sub>8</sub>.
- Authors
Shvanskaya, Larisa; Yakubovich, Olga; Massa, Werner; Vasiliev, Alexander
- Abstract
Monoclinic dicaesium copper tetraaluminate, Cs2CuAl4O8, space group P21/ c, a = 8.4551 (7), b = 10.012 (1), c = 17.073 (2) Å, β = 101.643 (9)°, Z = 6, was obtained by high-temperature crystallization from a phosphate flux. Its microporous crystal structure presents the first example of double layers built from [AlO4] tetrahedra combined in 4-, 6- and 8-rings, topologically similar to those found in the ATT-type zeolites and isostructural minerals armstrongite, davanite and dalyite. These layers show a rare arrangement of three [AlO4] tetrahedra sharing one oxygen vertex. The aluminate slabs are further linked by chains of edge-sharing [CuO4] square planes to form a mixed anionic three-dimensional framework with Cs+ cations in channels and cavities. An unusually short Cu...Cs distance of 3.166 Å is ascribed to the strong Jahn-Teller effect of Cu2+. The magnetic subsystem demonstrates properties of an alternating antiferromagnetic chain with a gap in the spectrum of magnetic excitations.
- Subjects
ZEOLITES; CESIUM compounds; JAHN-Teller effect
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2015, Vol 71, Issue 5, p498
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520615014699