Tricaesium undecalanthanum dodecaselenate(IV) dodecachloride

Abstract

Key indicatorsSingle-crystal X-ray study T = 173 K Mean (e-O) = 0.006 Å R factor = 0.044 wR factor = 0.095 Data-to-parameter ratio = 26.0For details of how these key indicators were automatically derived from the article, seeThe structure of the title compound, Cs 3 La 11 (SeO 3 ) 12 Cl 12 , consists of complex slabs of composition [La 22 (SeO 3 ) 24 ] that are stacked along the a axis and are separated by sublayers of either chloride anions or caesium chloride. All SeO 3 groups show the typical pyramidal shape. The Se-O bond distances vary from 1.672 (6) to 1.747 (6) Å .

Rare‐Earth Cadmium Tellurite Chlorides with a Structural Type Exhibiting [Ln12(TeO3)12] Slabs Alternating with CdCl6 Octahedral Layers

“…After annealing, the cadmium halide flux was dissolved at room temperature in distilled water. Initial attempts to grow crystals of the target compounds under conditions employed in the synthesis of selenium compounds18–20 provided only microcrystalline powders. Primary X‐ray checks of the washed samples yielded rather complex patterns wherein most strong lines could be indexed on the basis of tetragonal cells with a ≈ 4 Å and c ≈ 13 Å, which are the expected subcell parameters for the target structures, for Ln = La–Gd.…”

“…Introduction of the lone‐pair Se IV cations is suggested to restrict the bond directions in the structure, yielding ultimately the open (layered) frameworks. Recent studies15,18–21 added a variety of new representatives to this family: Cs 3 La 11 (SeO 3 ) 12 Cl 12 , MNd 10 (SeO 3 ) 12 Cl 8 (M = Ca and Sr), Cs 7 Pr 11 (SeO 3 ) 12 Cl 16 , K 7 Sm 11 (SeO 3 ) 12 Cl 16 , and Cs 7 Nd 11 (SeO 3 ) 12 Cl 16 . Although the family of selenium compounds and structures is quite diverse, no tellurium analogue has hitherto been reported.…”

Synthesis, Structures, and Luminescent Properties of Sodium Rare‐Earth Metal(III) Chloride Oxotellurates(IV), Na2Ln3Cl3[TeO3]4 (Ln = Sm, Eu, Gd, Tb, Dy, and Ho)

“…The routine phase analysis of the patterns in the LnOCl-TeO 2 -NaCl (Ln = La -Dy) systems indicates that isostructural compounds are indeed formed in all samples, but their XRD patterns are different from those of Cs and Rb oxoselenate(IV) or oxotellurate(IV) halides. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] Most reflexions could be indexed on the basis of a C-centered unit cell (by analogy with Na 2 Y 3 Cl 3 [TeO 3 ] 4 [25] ) though the patterns demonstrated strong texturing (which can be expected considering the crystal shape), and traces of unknown admixtures were present.…”

“…Based on these considerations, we had conducted systematic searches for new halide chalcogenates(IV) of rare-earth and alkali metals, [14][15][16][17] which, together with reference data, [18][19][20][21][22][23] indicate existence of a vast family of selenium compounds. In the meantime, until recently, just a handful of oxotellurates(IV), short tellurites, had been described, namely Cs 7 Eu 11 Cl 16 [TeO 3 ] 12 , [23] Na 2 Lu 3 I 3 [TeO 3 ] 4 , [24] and Na 2 Y 3 Cl 3 [TeO 3 ] 4 .…”

Cs7Sm11[TeO3]12Cl16 and Rb7Nd11[TeO3]12Br16, the new tellurite halides of the tetragonal Rb6LiNd11[SeO3]12Cl16 structure type

“…A large group of compounds therein adopt layered structures [14][15][16][17][18][19][20][21][22][23][24]; those containing Se IV and Te IV exhibit particularly complex architectures briefly reviewed in [14]. A variety of these are layered and contain [M 11+x (ChO 3 ) 12 ] n+ 2D frameworks (M = Ln or Bi, in some cases partially substituted by Mn, Co, Ni, Cu II , Ca, Sr, or Li, x = 0 or 1; Ch = Se or Te, n = 8, 9, or 12).…”