Uranium Tellurides: New One- and Two-Dimensional Compounds CsUTe6, CsTiUTe5, Cs8Hf5UTe30.6, and CsCuUTe3

Abstract

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Unique Periodic Modulations in the Infinite [Tex]n−Chains of RbUSb0.33Te6

“…Such distortion can be easily understood as a rendition of the one-dimensional Peierls distortion, which results in a lowering of the "lled orbital (HOMO) energy levels and opening a HOMO-LUMO gap (21). No such modulation in the zig-zag Te chains was reported in CsUTe (20). The re"nement of the superstructure also provides a better picture of the cationic arrangement in the channels as well.…”

“…The structure of RbUSb Te seems to be related to that of CsUTe (20). The latter features double [UTe ]\ columns linked with ditelluride fragments.…”

Comprehensive Uranium Thiophosphate Chemistry: Framework Compounds Based on Pseudotetrahedrally Coordinated Central Metal Atoms

“…Still, in the chalcogen-rich systems the chalcogen's ability to catenate has led to formal oxidation state assignments beyond 4+ in Rb 5 U 4 P 4 Se 26 = Rb 4 (U 5+ ) 4 (PSe 4 3-) 4 P(Se 2 2-) 4 (Se 2-) 2 , [11] which are still object of discussion. [12] Whereas binary or ternary uranium (and actinide) chalcogenides [13][14][15][16][17][18][19][20][21][22] and quaternary uranium (and actinide) chalcophosphates A a U x P y Q z , [23][24][25][26][27][28][29][30][31][32] many of which are accessible from reactive polychalcogenide fluxes, [33] are reasonably well characterized, our information concerning the corresponding ternary compounds U x P y Q z is scarce. [34] We have observed in the initial report [35] of the research described herein in full that the tetrahedral network compound U(P 2 S 6 ) 2 is formed by the reaction of U, P 2 S 5 , and S. Herein the uranium atoms are coordinated by the chalcogeno moieties in a pseudotetrahedral manner with thiophosphate groups acting as linear connectors between the central metal atoms.…”

Synthesis and structure of CsTi5Te8: Relation to the TlV5S8, TlCr3S5, and similar channel structures

“…While resynthesizing CsTiUTe 5 [5], we isolated CsTi 5 Te 8 as well. It turns out that CsTi 5 Te 8 is not isostructural to any other M M 5 Q 8 compound, but is a new structure type.…”