�ber Oxoterbate(IV): Na2TbO3

Hoppe, R.; Lidecke, Werner

doi:10.1007/bf00601415

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…This particular arrangement of the layers is similar to that of SnF 4 21 and WO 2 Cl 2 ,22 but whereas in tetragonal SnF 4 the crystal structure can be described with an inversion center in space group I 4/ mmm , orthorhombic WO 2 Cl 2 crystallizes in space group P 2 1 am and is therefore also non ‐centrosymmetric as observed for MoO 2 Br 2 . In both cases this tributes to the central cations (Mo 6+ and W 6+ ), being not situated in the centers of the surrounding octahedra but shifted towards an O ··· O edge.…”

Section: Resultssupporting

confidence: 58%

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

Schustereit

Schleid

Hartenbach

2011

Zeitschrift anorg allge chemie

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Red, transparent single crystals of molybdenum(VI) dioxide dibromide MoO 2 Br 2 emerged as by-product after thermal analyses of reaction mixtures comprising REBr 3 (RE = La or Gd) and MoO 3 . The structure of this highly water sensitive compound can be described in the non-centrosymmetric monoclinic space group Cc with the lattice constants a = 1522.33 (15) pm, b = 390.61(4) pm, c = 771.09(8) pm, β = 104.394(7)°and four formula units per unit cell. Crystallographically unique Mo 6+ cations are surrounded by four oxide and two * Dr. I. Hartenbach

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Section: Resultssupporting

confidence: 58%

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

Schustereit

Schleid

Hartenbach

2011

Zeitschrift anorg allge chemie

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“…However, in 2014 Dehnen and co‐workers presented the tetrahedral [PbSe 4 ] 4− , which is isoelectronic to the unknown PbBr 4 and is stable in an inert gas atmosphere for months . PbF 4 could be isolated by reacting PbBr 2 with F 2 gas at approximately 400 °C . Beckmann and co‐workers recently presented the first stable monoaryllead trichloride RPbCl 3 (R=6‐Ph 2 P(O)‐Ace‐5‐; Ace: acenaphthylene), which is kinetically stabilized by O‐donor substituents and which could be used as a precursor for the synthesis of diaryllead dichlorides …”

Section: Tetravalent Halides Of Germanium Tin and Leadmentioning

confidence: 99%

Halides of the Heavier Group 14 Homologues Germanium, Tin, and Lead—A Journey through Unusual Compounds and Oxidation States

Kunz

Schnepf

2018

Chemistry A European J

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Classical halides of the heavier Group 14 homologues germanium, tin, and lead are common precursors for the synthesis of exciting compounds, such as polyhedral clusters. To get access to larger metalloid cluster compounds of Group 14, the disproportionation reaction of metastable monohalide solutions, accessible through a preparative co‐condensation reaction, proved to be quite successful. As the identity of the subvalent halides within the metastable solutions were yet unknown the reaction course from a monohalide precursor to a metalloid cluster was mostly unidentified. This might change now, as a first subhalide cluster [Ge14Br8(Et3P)4] could be characterized, being the first trapped intermediate of the disproportionation reaction of Group 14 subhalides. All these aspects are included within this Minireview, together with a short historical overview, dealing with the development of the preparative co‐condensation technique out of the matrix isolation technique, being the essential first step of the synthesis of metastable monohalide solutions of the heavier Group 14 elements Ge and Sn.

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“…Na 2 LnO 3 polycrystalline samples were synthesized and structurally characterized by Hoppe et al in the 1970s. , These materials were characterized in the C 2/ c space group with a 3D structure of fully ordered LnO 6 octahedra and a proposed hyperhoneycomb connectivity. However, the Na 2 LnO 3 materials were later structurally characterized by Hinatsu and Doi, also in the C 2/ c space group, with a layered structure.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Cation Ordering and Sodium Displacements in Layered Honeycomb Oxides with Tetravalent Lanthanides: Na₂LnO₃ (Ln = Ce, Pr, and Tb)

2021

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The detailed structural characterization of "213" honeycomb systems is a key concern in a wide range of fundamental areas, such as frustrated magnetism, and technical applications, such as cathode materials, catalysts, and thermoelectric materials. Na 2 LnO 3 (Ln = Ce, Pr, and Tb) are an intriguing series of "213" honeycomb systems because they host tetravalent lanthanides. "213" honeycomb materials have been reported to adopt either a cation-disordered R3̅ m subcell, a cationordered trigonal (P3 1 12), or monoclinic (C2/c or C2/m) supercell. On the basis of analysis of the average (synchrotron diffraction) and local [pair distribution function (PDF) and solid-state NMR] structure probes, cation ordering in the honeycomb layer of Na 2 LnO 3 materials has been confirmed. Through rationalization of the 23 Na chemical shifts and quadrupolar coupling constants, the local environment of Na atoms was probed with no observed evidence of cation disorder. Through these studies, it is shown that the Na 2 LnO 3 materials adopt a C2/c supercell derived from symmetry-breaking displacements of intralayered Na atoms from the ideal crystallographic position (in C2/m). The Na displacement is validated using distortion index parameters from diffraction data and atomic displacement parameters from PDF data. The C2/c supercell is faulted, as evidenced by the increased breadth of the superstructure diffraction peaks. DIFFaX simulations and structural considerations with a two-phase approach were employed to derive a suitable faulting model.

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�ber Oxoterbate(IV): Na2TbO3

Cited by 15 publications

References 6 publications

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

Halides of the Heavier Group 14 Homologues Germanium, Tin, and Lead—A Journey through Unusual Compounds and Oxidation States

In-Plane Cation Ordering and Sodium Displacements in Layered Honeycomb Oxides with Tetravalent Lanthanides: Na₂LnO₃ (Ln = Ce, Pr, and Tb)

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�ber Oxoterbate(IV): Na2TbO3

Cited by 15 publications

References 6 publications

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO2Br2

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO2Br2

Halides of the Heavier Group 14 Homologues Germanium, Tin, and Lead—A Journey through Unusual Compounds and Oxidation States

In-Plane Cation Ordering and Sodium Displacements in Layered Honeycomb Oxides with Tetravalent Lanthanides: Na2LnO3 (Ln = Ce, Pr, and Tb)

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The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

The Non‐Centrosymmetric Crystal Structure of Molybdenum(VI) Oxide Bromide MoO₂Br₂

In-Plane Cation Ordering and Sodium Displacements in Layered Honeycomb Oxides with Tetravalent Lanthanides: Na₂LnO₃ (Ln = Ce, Pr, and Tb)