Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]
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Beate M. Schulz
Abstract
Three new compounds of the CsLn[P2Se6] family with Ln = Ce, Sm and Er have been prepared and structurally characterized. Plate-shaped, amber-colored single crystals of these cesium lanthanoid(III) hexaselenodiphosphates(IV) were obtained by heating stoichiometric amounts of Ln, P and Se with CsCl as a reactive flux in fused silica ampoules at 800 °C for four days. CsCe[P2Se6] crystallizes monoclinically in space group P21/c with a = 1297.86(9), b = 776.24(5), c = 1198.43(8) pm, β = 106.589(3)° and Z = 4. The structure is isotypic with that of KLa[P2Se6], the Cs+ cations being ten-fold coordinated by selenium atoms to form double layers of condensed [CsSe10]19− polyhedra. Ce3+ resides in a nine-fold coordination and the [CeSe9]15− polyhedra also form double layers parallel to (100). CsSm[P2Se6] crystallizes in the orthorhombic space group P212121 with a = 688.67(5), b = 754.48(5), c = 2215.21(15) pm and Z = 4. Its structure is isotypic with that of KY[P2Se6] and the Cs+ cations reside in an eleven-fold coordination of selenium atoms constituting monolayers of condensed [CsSe11]21− polyhedra within the (001) plane. Sm3+ exhibits an eight-fold coordination sphere of selenium atoms and the [SmSe8]13− polyhedra are also linked to build up parallel monolayers. CsEr[P2Se6] crystallizes in the monoclinic space group P21/c again, but forms its own structure type with the lattice parameters a = 753.81(5), b = 1281.92(9), c = 1276.47(9) pm and β = 106.898(3)° and Z = 4. The Cs+ cations are twelve-fold coordinated by selenium atoms and erects a three-dimensional framework of condensed [CsSe12]23− polyhedra. The Er3+ cations show seven selenium atoms as neighbors and the [ErSe7]11− polyhedra are edge-connected to form discrete dimers [Er2Se12]18−. All three structures have similar ethane-like [P2Se6]4– anions in staggered conformation with bond lengths of 219–226 pm for d(P1–P2) and 213–222 pm for d(P–Se), which connect the Cs+ and Ln3+ coordination polyhedra into three-dimensional crystal structures.
Dedicated to: Professor Robert Glaum on the occasion of his 60th birthday.
Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- In this issue
- Editorial
- Robert Glaum zum 60. Geburtstag gewidmet
- Research Articles
- Structural transition and antiferromagnetic ordering in the solid solution CePd1−xAuxAl (x = 0.1–0.9)
- Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms
- Intergrowth of niobium tungsten oxides of the tetragonal tungsten bronze type
- FeBiS2Cl – A new iron-containing member of the MPnQ2X family
- Thallium diphosphates
- Behavior of beryllium halides and triflate in acetonitrile solutions
- Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu)
- Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]
- The crystal structure of ZrCr2D≈4 at 50 K ≤ T ≤ 200 K
- High-pressure synthesis and crystal structure of HP-Al2B3O7(OH)
- New layered supertetrahedral compounds T2-MSiAs2, T3-MGaSiAs3 and polytypic T4-M4Ga5SiAs9 (M = Sr, Eu)
- Comparative photophysical study of Pt(II) complex-nanoclay hybrid materials as dry powders and hydrogels
- Carbon subsulfide C3S2 – synthesis by flash vacuum pyrolysis and crystal structure determination
Articles in the same Issue
- Frontmatter
- In this issue
- Editorial
- Robert Glaum zum 60. Geburtstag gewidmet
- Research Articles
- Structural transition and antiferromagnetic ordering in the solid solution CePd1−xAuxAl (x = 0.1–0.9)
- Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms
- Intergrowth of niobium tungsten oxides of the tetragonal tungsten bronze type
- FeBiS2Cl – A new iron-containing member of the MPnQ2X family
- Thallium diphosphates
- Behavior of beryllium halides and triflate in acetonitrile solutions
- Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu)
- Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]
- The crystal structure of ZrCr2D≈4 at 50 K ≤ T ≤ 200 K
- High-pressure synthesis and crystal structure of HP-Al2B3O7(OH)
- New layered supertetrahedral compounds T2-MSiAs2, T3-MGaSiAs3 and polytypic T4-M4Ga5SiAs9 (M = Sr, Eu)
- Comparative photophysical study of Pt(II) complex-nanoclay hybrid materials as dry powders and hydrogels
- Carbon subsulfide C3S2 – synthesis by flash vacuum pyrolysis and crystal structure determination
