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- W2940013863 abstract "A family of compounds with general chemical formula Ln2[(UO2)2V2O8]3·nH2O, where Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Er, Yb, Y has been hydrothermally synthesized and structurally characterized. The structures of all these compounds can be described as the stacking of carnotite-type uranyl vanadate layers pillared by lanthanide–oxygen polyhedra. Except for La, they are isostructural, and the crystal structure determination of Nd2[(UO2)2V2O8]3·22H2O and Y2[(UO2)2V2O8]3·20H2O shows that the ud/du/du geometrical isomers of the uranyl vanadate layers are pillared by Nd(Oyl)2(H2O)7 and Y(Oyl)2(H2O)6 polyhedra, respectively, through interactions between the lanthanide ion and the oxygens Oyl of two vanadyl ions forming V═Oyl–Ln–Oyl═V entities. In the La compound, the ud/du geometrical isomers of the uranyl vanadate layers are pillared by La(Oyl)2(H2O)8, through interactions between the lanthanum ion and the oxygens Oyl of one vanadyl and one uranyl ion, forming U═Oyl–La–Oyl═V entities. Thermogravimetric and high-temperature X-ray diffraction studies show that the dehydration of the La compound is also singular; while the dehydration of other compounds involves a regular decrease in the interlayer space, for La it is realized through structural transitions. Upon partial dehydration, the La crystalline material undergoes a single-crystal to single-crystal transition between the 20- and 6-hydrates. Despite very large variation of the unit cell parameters and volume (ΔV = −27.8%!), the crystal remained of sufficient quality to allow the crystal structure determination of the hexahydrate. The total dehydration is reversible." @default.
- W2940013863 created "2019-04-25" @default.
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- W2940013863 date "2019-04-18" @default.
- W2940013863 modified "2023-10-17" @default.
- W2940013863 title "Structural Evolution in the Rare-Earth Uranyl Vanadates <i>Ln</i><sub>2</sub>[(UO<sub>2</sub>)<sub>2</sub>V<sub>2</sub>O<sub>8</sub>]<sub>3</sub>·<i>n</i>H<sub>2</sub>O, Singularity of the Lanthanum Compound, and Single-Crystal to Single-Crystal Partial Dehydration" @default.
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- W2940013863 doi "https://doi.org/10.1021/acs.cgd.9b00171" @default.
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