The syntheses and crystal structures of two novel aluminum selenites, Al sub 2 (SeO sub 3 ) sub 3 ter dot 6H sub 2 O and AlH(SeO sub 3 ) sub 2 ter dot 2H sub 2 O
- Univ. of Oxford (United Kingdom)
- Univ. of California, Santa Barbara (United States)
Al{sub 2}(SeO{sub 3}){sub 3} {center dot} 6H{sub 2}O and AlH(SeO{sub 3}){sub 2} {center dot} 2H{sub 2}O were prepared hydrothermally at 70C. Al{sub 2}(SeO{sub 3}){sub 3} {center dot} 6H{sub 2}O is trigonal (space group P31 c) with a = 8.8020(6) and c = 10.7070(8) {angstrom}, Z = 2, V = 718.39 {angstrom}{sup 3}, 1,377 observed reflections (I > 3{sigma}(I)), R = 3.27%, and R{sub w} = 3.55%. The structure consists of discrete Al{sub 2}(SeO{sub 3}){sub 3} {center dot} 6H{sub 2}O units which are linked via hydrogen bonding to form an open structure with channels running parallel to the (0001) direction. AlH(SeO{sub 3}){sub 2} {center dot} 2H{sub 2}O is monoclinic (P2{sub 1}/n) with a = 7.3853(5), b = 6.4895(6), and c = 7.3958(7) {angstrom}, {beta} = 106.28(9){degree}, Z = 2, V = 340.24 {angstrom}{sup 3}, 732 observed reflections, R = 4.04%, and R{sub w} = 3.98%. The structure consists of octahedral AlO{sub 6} units which are interlinked via the sharing of vertices with four separate selenite groups. The selenite groups form dimers which appear to contain a symmetry-restricted hydrogen bond. This symmetry-restricted bond is markedly shorter than the other hydrogen bonds in the structure. The infrared spectra and thermal decomposition behavior of both compounds are also reported.
- OSTI ID:
- 7163538
- Journal Information:
- Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 94:2; ISSN JSSCB; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
BOND ANGLE
BOND LENGTHS
CHEMICAL PREPARATION
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DIMENSIONS
DIMERS
FOURIER ANALYSIS
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
LENGTH
MOLECULAR STRUCTURE
MONOCLINIC LATTICES
OXYGEN COMPOUNDS
PH VALUE
SCATTERING
SELENITES
SELENIUM COMPOUNDS
SPECTRA
SYNTHESIS
THERMAL DEGRADATION
TRIGONAL LATTICES
X-RAY DIFFRACTION