Structure cristalline de la schmitterite synthétique UTeO5

Meunier, G.; Galy, J.

doi:10.1107/s0567740873004334

Cited by 34 publications

(29 citation statements)

References 7 publications

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“…The observed U-O bond lengths in uranyls are close to the average value 1.815 Å [19] and 1.805 Å [6] and agree also with the values proposed by Burns [25][26][27] for the uranyl natural and synthetic compounds having the uranyl pentagonal dipyramidal coordination polyhedra in their crystal structures. The number of the uranyl stretching vibrations observed in Raman and infrared spectra of schmitterite is not in disagreement with the asymmetry of the (O-U-O) 2+ bonds, FGA and number of molecules in the unit cell of schmitterite.…”

Section: Raman Spectroscopysupporting

confidence: 89%

“…The empirical relations by Bartlett and Cooney are used [36]. Obtained U-O bond lengths are close to those inferred from the X-ray single crystal structure of synthetic schmitterite [6,19] and in agreement with those observed in other natural or synthetic uranyl tellurites. …”

Section: Discussionsupporting

confidence: 72%

“…Infrared spectra of synthetic cliffordite [16] and synthetic schmitterite [17] have been published. Crystal structures of synthetic cliffordite [5,18] synthetic schmitterite [6,7,19] and moctezumite [11] and of some synthetic uranyl tellurites [20][21][22][23] are known.…”

Section: Introductionmentioning

confidence: 99%

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A Raman spectroscopic study of the uranyl tellurite mineral schmitterite

Frost

Čejka

Weier

et al. 2006

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Raman spectra of schmitterite measured at 298 and 77 K are presented and discussed in detail and in part in comparison with published IR spectrum of synthetic schmitterite. U-O bond lengths in uranyls, calculated with the empirical relations R U-O = f[ν 1 (UO 2 ) 2+ ] Å and R U-O = f[ν 3 (UO 2 ) 2+ ] Å, are close to those inferred from the Xray single crystal structure of synthetic schmitterite and agree also with the data for other natural and synthetic uranyl tellurites.

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Section: Raman Spectroscopysupporting

confidence: 89%

Section: Discussionsupporting

confidence: 72%

See 1 more Smart Citation

A Raman spectroscopic study of the uranyl tellurite mineral schmitterite

Frost

Čejka

Weier

et al. 2006

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…From the 2.6 (7) 1.5 (4) 2.2 (7) 3.3 (8) Table 5 the main 0.71 (3) bond lengths and angles obtained in the isotropic 0.67 (4) refinement. As the shifts are small the illustrations given by Meunier & Galy (1973) suffice to depict the structure. Tables 1 and 4 illustrate the close similarity between UO2SeO 3 and UO2TeO 3 [0(3) in Table 1 corresponding to 0(3) and 0(4) in Table 4].…”

mentioning

confidence: 99%

“…In Table 3 the coordinates of UOETeO 3 as determined by Meunier & Galy (1973) are given (after transformation by 0,-1,0,0; 1,0,0,0; 0,0,1,¼). As also shown in Table 3, the atoms are found to be almost at the positions required by space group Pbcm.…”

mentioning

confidence: 99%

Uranyl selenite and uranyl tellurite

Loopstra¹,

Brandenburg²

1978

Acta Crystallogr B Struct Sci

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Unusual Uranyl Tellurites Containing [Te2O6]4 Ions and Three-Dimensional Networks

Almond¹,

McKee²,

Albrecht‐Schmitt³

2002

Angew. Chem. Int. Ed.

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Solid-state chemistry of the actinides is the subject of significant investigation because of its relevance to nuclear waste disposal and power generation, [1] mineralogy, [2] and catalysis. [3] One system that is poorly understood is that of the uranyl tellurites, which are currently known only from three minerals, UO 2 (Te 3 O 7 ), [4] PbUO 2 (TeO 3 ) 2 , [5] and UO 2 (TeO 3 ), [6] and the synthetic phase Pb 2 UO 2 (TeO 3 ) 3 . [7] In spite of their low representation, these compounds differ substantially in their dimensionality, [2] the coordination environments of the U VI center, and in the Te IV oxoanions present.The ubiquitous presence of a stereochemically active lone pair of electrons on the Te IV centers certainly plays a substantial role in the crystalline architecture of this family of compounds. However, the general tendency is for oxoanions containing nonbonding electrons to either not affect the overall dimensionality of U VI compounds, or to reduce it from two-dimensional to one-dimensional, as demonstrated by uranyl iodates [8, 9] and selenites. [10] In uranyl tellurites this trend is not observed. The ability of Te IV to bind four or five O atoms in its inner sphere, as found in the ternary phases, BaTe 3 O 7 , [11] BaTe 4 O 9 , [11] TeSeO 4 , [12] UO 2 (TeO 3 ), [6] and UO 2 (-Te 3 O 7 ) [4] does not offer a satisfying explanation for the atypical behavior of uranyl tellurites because Pb 2 UO 2 (TeO 3 ) 3 contains only TeO 3 2À ions, and yet it still adopts a threedimensional architecture. [7] To address the unusual bonding in the uranyl tellurite system we are systematically preparing a series of compounds by hydrothermal methods that differ primarily in their countercations. For example, the reaction of TlCl with UO 2 (C 2 H 3 O 2 ) 2 ¥2 H 2 O and Na 2 TeO 3 at 180 8C in aqueous media for three days produces Tl 2 [UO 2 (TeO 3 ) 2 ] (1), whereas, in the absence of TlCl, Na 8 [(UO 2 ) 6 (TeO 3 ) 10 ] (2) is isolated instead.The simplicity of the formula of 1 is quite misleading because its structure is far from predictable. The uranyl tellurite architecture in this compound is constructed from uranyl moieties that are bound by five O atoms to create UO 7 pentagonal bipyramids. These polyhedra edge-share to form dimers. The dimers are joined by bridging TeO 3 2À ions to yield one-dimensional chains. The chains are in turn linked by [Te 2 O 6 ] 4À ions that are bischelating/bridging, producing twodimensional 2 1 [UO 2 (TeO 3 ) 2 ] 2À sheets that are separated by Tl þ ions. Part of a 2 1 [UO 2 (TeO 3 ) 2 ] 2À sheet is illustrated in Figure 1. Bond valence sum calculations are consistent with U VI and COMMUNICATIONS 3426

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Structure cristalline de la schmitterite synthétique UTeO5

Cited by 34 publications

References 7 publications

A Raman spectroscopic study of the uranyl tellurite mineral schmitterite

A Raman spectroscopic study of the uranyl tellurite mineral schmitterite

Uranyl selenite and uranyl tellurite

Unusual Uranyl Tellurites Containing [Te2O6]4 Ions and Three-Dimensional Networks

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