Three modifications of BaCu(SeO/sub 3/)/sub 2/ and the compound SrCu(SeO/sub 3/)/sub 2/: preparation and crystal structure determination
The crystal structures of four hydrothermally synthesized alkaline earth-copper-selenites were determined: BaCu(SeO/sub 3/)/sub 2/-I (a = 5.247(1), b = 13.353(2), c = 8.981(1) A, space group Pnm2/sub 1/, Z = 4, R/sub w/ = 0.024 for 1270 reflections), BaCu(SeO/sub 3/)/sub 2/-II (a = 5.256(1), b = 13.231(2), c = 8.933(1) A, ..beta.. = 90.19(1)/sup 0/, space group P2/sub 1//c, Z = 4, R/sub w/ = 0.046 for 2238 reflections), BaCu(SeO/sub 3/)/sub 2/-III (a = 8.0311(1), b = 5.185(1), c = 15.823(2) A, ..beta.. = 90.83(1)/sup 0/, space group C2/c, Z = 4, R/sub w/ = 0.038 for 1866 reflections), and SrCu(SeO/sub 3/)> (a = 7.929(1), b = 5.132(1), c = 14.997(2) A, ..beta.. = 90.53(1)/sup 0/, space group C2/c, Z = 4, R/sub w/ and 0.028 for 1414 reflections; isotypic with BaCu(SeO/sub 3/)/sub 2/-III). BaCu(SeO/sub 3/)-I and -II contain Cu(SeO/sub 3/)/sub 2/ sheets lying parallel to (100) formed by CuO/sub 4/ squares and selenite groups. These sheets are topologically different: in BaCu(SeO/sub 3/)/sub 2/-I they are formed by the connection of Cu/sub 2/(SeO/sub 3/) and Cu/sub 6/(SeO/sub 3/)/sub 4/ rings while in BaCu(SeO/sub 3/)/sub 2/-II they are formed by Cu/sub 2/(SeO/sub 3/)/sub 2/ and Cu/sub 6/(SeO/sub 3/)/sub 6/ rings. The Cu(SeO/sub 3/)/sub 2/ sheets are rugged in BaCu(SeO/sub 3/)/sub 2/-I and they are slightly waved in BaCu(SeO/sub 3/)/sub 2/-II. In both compounds they are connected to each other by a fifth Cu-O bond and by the Ba atoms. In BaCu(SeO/sub 3/)/sub 2/-III and in its isotypic Sr analog the CuO/sub 4/ squares and the selenite groups form parallel chains (010), which are connected by the alkaline earth atoms.
- Research Organization:
- Universitaet Wien, Austria
- OSTI ID:
- 5775136
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 70:2; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPLEXES
BARIUM COMPLEXES
CHEMICAL PREPARATION
COHERENT SCATTERING
COMPLEXES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DATA
DIFFRACTION
EXPERIMENTAL DATA
INFORMATION
LATTICE PARAMETERS
NUMERICAL DATA
OXYGEN COMPOUNDS
SCATTERING
SELENATES
SELENIUM COMPOUNDS
SPACE GROUPS
STRONTIUM COMPLEXES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION