Syntheses and crystal structures of the quaternary uranium lanthanide oxyselenides UYb{sub 2}O{sub 2}Se{sub 3} and U{sub 2}Ln{sub 2}O{sub 4}Se{sub 3} (Ln=Pr, Sm, Gd)

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.12.002· OSTI ID:21612908

Raw, Adam D ^[1]

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1. Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3113 (United States)

Single crystals of the new uranium lanthanide oxyselenide compounds UYb{sub 2}O{sub 2}Se{sub 3} and U{sub 2}Ln{sub 2}O{sub 4}Se{sub 3} (Ln=Pr, Sm, Gd) have been synthesized from an Sb{sub 2}Se{sub 3} flux. The structures have been determined from single-crystal X-ray diffraction data. UYb{sub 2}O{sub 2}Se{sub 3} is isostructural to UYb{sub 2}O{sub 2}S{sub 3}. The structure comprises layers of edge-sharing YbSe{sub 6} octahedra and double layers of disordered (U/Ln)O{sub 4}Se{sub 4} square antiprisms. The U{sub 2}Ln{sub 2}O{sub 4}Se{sub 3} (Ln=Pr, Sm, Gd) compounds are isostructural to U{sub 2}Ln{sub 2}O{sub 4}S{sub 3} (Ln=La-Gd) whose structure had been deduced previously from X-ray powder diffraction data. In the structure a dodecahedron of four O atoms and four Se atoms surrounds a site primarily occupied by U and a distorted bicapped octahedron of five Se atoms and three O atoms surrounds a site primarily occupied by the lanthanide. These compounds represent the first examples of quaternary uranium oxyselenides. - Graphical abstract: The U{sub 2}Ln{sub 2}O{sub 4}Se{sub 3} (Ln=Pr, Sm, Gd) structure: primarily U sites are in black, primarily Ln sites are in blue, O red, Se orange. Highlights: Black-Right-Pointing-Pointer Single crystals of the new compounds UYb{sub 2}O{sub 2}Se{sub 3} and U{sub 2}Ln{sub 2}O{sub 4}Se{sub 3} (Ln=Pr, Sm, Gd) have been synthesized. Black-Right-Pointing-Pointer These compounds represent the first examples of quaternary uranium oxyselenides. Black-Right-Pointing-Pointer U is surrounded by a dodecahedron or square prism of four O atoms and four Se atoms

• OSTI ID: 21612908
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 186; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACTINIDES
ANIONS
ANTIMONY COMPOUNDS
ANTIMONY SELENIDES
ATOMS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUX SYNTHESIS
IONIZING RADIATIONS
IONS
LAYERS
METALS
MONOCRYSTALS
OXYGEN COMPOUNDS
OXYSELENIDES
RADIATIONS
RARE EARTHS
SCATTERING
SELENIDES
SELENIUM COMPOUNDS
SYNTHESIS
URANIUM
X RADIATION
X-RAY DIFFRACTION