Infrared spectra of liebigite, andersonite, voglite and schroeckingerite

1979 ◽  
Vol 44 (1) ◽  
pp. 10-23 ◽  
Author(s):  
Zdeněk Urbanec ◽  
Jiří Čejka
Keyword(s):  
Diffraction Analysis ◽  
Infrared Spectra ◽  
Equatorial Plane ◽  
Complex Anion ◽  
Layer Structure ◽  
X Ray Diffraction ◽  
Carbonate Group ◽  
X Ray ◽  
Hexagonal Bipyramid

Infrared spectra of mineral possessing layer structure - liebigite, Ca2[UO2(CO3)3].(8-11) H2O, schroeckingerite, NaCa3[UO2(CO3)3]SO4F.10 H2O, voglite, Ca2Cu[UO2(CO3)4].6 H2O (?), and synthetic andersonite, Na2Ca[UO2(CO3)3].6 H2O - were measured and interpreted and compared with the published infrared spectra of ammonium, potassium, rubidium, and cesium dioxo-tricarbonatouranates(VI). From the analysis of the infrared spectra it follows - in accordance with the results of X-ray diffraction analysis - that in the dioxo-tricarbonatouranate(VI) complex anion, [UO2(CO3)3]4-, forming hexagonal bipyramid, three bidentately bonded carbonate groups are present in the equatorial plane (in liebigite and andersonite and apparently also in schroeckingerite and voglite). The coordinations of the SO42- and F- ions in schroeckingerite and of the fourth carbonate group (?) in voglite have not been elucidated.

An X-ray crystallographic, Raman, and infrared spectral study of crystalline potassium uranyl carbonate, K4UO2(CO3)3

1980 ◽  
Vol 58 (16) ◽  
pp. 1651-1658 ◽  
Author(s):  
Anthony Anderson ◽  
Chung Chieh ◽  
Donald E. Irish ◽  
James P. K. Tong
Keyword(s):  
Infrared Spectra ◽  
Equatorial Plane ◽  
Spectral Study ◽  
The Other ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Uranyl Carbonate ◽  
Infrared Spectral

X-ray diffraction studies have revealed that K4UO2(CO3)3 is isostructural with (NH4)4UO2(CO3)3; the crystal is monoclinic with a = 10.247(3), b = 9.202(2), c = 12.226(3) Å, β = 95.11(2)°, Z = 4, and space group C2/c. Three carbonate anions are arranged in bidentate fashion in the equatorial plane of UO22+; one of these occupies a C2 site and the other two occupy C1 sites. All carbonates are significantly distorted from D3h symmetry. The binding of carbonates to uranyl is strong and thus the lattice can be considered to be composed of [UO2(CO3)3]4− anions and K+ cations. The Raman and infrared spectra exhibit fewer lines than predicted for such a crystal. Tentative assignments are suggested for the more prominent bands of the constituent polyatomic species.

Infrared spectroscopic study of the YPO4-YCrO4 system

1985 ◽  
Vol 50 (10) ◽  
pp. 2139-2145
Author(s):  
Alexander Muck ◽  
Eva Šantavá ◽  
Bohumil Hájek
Keyword(s):  
Spectroscopic Study ◽  
Infrared Spectra ◽  
Point Of View ◽  
Mixed Crystals ◽  
Crystal Symmetry ◽  
Infrared Spectroscopic Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic ◽  
Diffraction Patterns

The infrared spectra and powder X-ray diffraction patterns of polycrystalline YPO4-YCrO4 samples are studied from the point of view of their crystal symmetry. Mixed crystals of the D4h19 symmetry are formed over the region of 0-30 mol.% YPO4 in YCrO4. The Td → D2d → D2 or C2v(GS eff) correlation is appropriate for both PO43- and CrO43- anions.

Ten-Vertex Polyhedral Monocarbaborane Chemistry. The Novel High-Yield Formation of the Ten-Vertex closo Compound [6-(PMe2Ph)-closo-1-CB9H9] from the Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11]

1993 ◽  
Vol 58 (12) ◽  
pp. 2924-2935 ◽  
Author(s):  
Jane H. Jones ◽  
Bohumil Štíbr ◽  
John D. Kennedy ◽  
Mark Thornton-Pett
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
High Yield ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
X Ray ◽  
Yield Formation ◽  
Boiling Toluene

Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11] in boiling toluene solution results in an elimination of the platinum centre and cluster closure to give the ten-vertex closo species [6-(PMe2Ph)-closo-1-CB9H9] in 85% yield as a colourles air stable solid. The product is characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Crystals (from hexane-dichloromethane) are monoclinic, space group P21/c, with a = 903.20(9), b = 1 481.86(11), c = 2 320.0(2) pm, β = 97.860(7)° and Z = 8, and the structure has been refined to R(Rw) = 0.045(0.051) for 3 281 observed reflections with Fo > 2.0σ(Fo). The clean high-yield elimination of a metal centre from a polyhedral metallaborane or metallaheteroborane species is very rare.

Bis(μ-carboxylato)dienerhodium(I) Complexes - Synthesis, Characterization and Catalytic Activity

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1205-1221 ◽  
Author(s):  
Jiří Zedník ◽  
Jan Sedláček ◽  
Jan Svoboda ◽  
Jiří Vohlídal ◽  
Dmitrij Bondarev ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray

Dinuclear rhodium(I) η2:η2-cycloocta-1,5-diene (series a) and η2:η2-norborna-2,5-diene (series b) complexes with μ-RCOO- ligands, where R is linear C21H43 (complexes 1a, 1b), CH2CMe3 (2a, 2b), 1-adamantyl (3a, 3b) and benzyl (4a, 4b), have been prepared and characterized by spectroscopic methods. Structures of complexes 2b, 3a and 4a were determined by X-ray diffraction analysis. Complexes prepared show low to moderate catalytic activity in polymerization of phenylacetylene in THF giving high-cis-transoid polymers, but they show only oligomerization activity in dichloromethane.

scholarly journals Crystals of the trp repressor-operator complex suitable for X-ray diffraction analysis.

1987 ◽  
Vol 262 (10) ◽  
pp. 4917-4921 ◽  
Author(s):  
A. Joachimiak ◽  
R.Q. Marmorstein ◽  
R.W. Schevitz ◽  
W. Mandecki ◽  
J.L. Fox ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Trp Repressor ◽  
X Ray
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