Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]

2020 ◽  
Vol 75 (11) ◽  
pp. 959-967
Author(s):  
Beate M. Schulz ◽  
Pia L. Lange ◽  
Thomas Schleid
Keyword(s):  
Three Dimensional ◽  
Structure Type ◽  
Fused Silica ◽  
Double Layers ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Coordination Polyhedra ◽  
Space Group ◽  
New Compounds ◽  
Dimensional Crystal

AbstractThree 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.

Aluminat-Pentelate(III) AI2M2Al2O7 und AIIM2Al2O7 (AI = Rb, Cs; AII = Ba; M = As, Sb) / Aluminate-Pentelates(III) AI2M2Al2O7 and AIIM2Al2O7 (AI = Rb, Cs; AII = Ba; M = As, Sb)

2005 ◽  
Vol 60 (4) ◽  
pp. 419-425 ◽  
Author(s):  
Franziska Emmerling ◽  
Christian Reinhard ◽  
Sabine Zimper ◽  
Caroline Röhr
Keyword(s):  
Three Dimensional ◽  
Structure Type ◽  
Double Layers ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Electron Pairs ◽  
Space Group ◽  
Alkaline Earth Elements ◽  
Dimensional Network ◽  
Vertex Sharing

The crystal structures of the title compounds, which were synthesized at temperatures between 500 and 850 °C via reaction of Al2O3, M2O3 and M2O5 (M = As, Sb) with the respective elemental alkaline and alkaline earth elements, have been determined by single crystal X-ray diffraction. The two isotypic compounds AI2Sb2Al2O7(K2Sb2Al2O7 structure type, AI=Rb/Cs; trigonal, space group P3̄̅m1, a = 566.04(10)/570.23(8), c = 836.8(2)/888.0(2) pm, Z = 1, R1 = 0.0511/0.0461) contain double layers consisting of vertex-sharing tetrahedra [Al2O7], which are connected to ψ- tetrahedra SbO3 via common vertices. These double layers are stacked in identical orientation (AA sequence), while in the barium compound BaSb2Al2O7 (trigonal, space group R32, a = 545.5(7), c = 2377.3(12) pm, Z = 3, R1 = 0.0427) similar layers [Sb2Al2O7] are stacked in an ABC sequence. In the arsenic(III) aluminate Cs2As2Al2O7 (orthorhombic, space group Imm2, a = 546.9(3), b = 1003.81(16), c = 888.5(3) pm, Z = 2, R1 = 0.0313) the Al2O7 moieties are similarly connected via [AsO3] units, in this case not only forming layers, but a three-dimensional network. In the three antimonates, the A cations are not coordinated by the lone electron pairs of M(III), which are oriented towards the interior of the sheets, whereas in the arsenate the lone electron pairs play a significant role in the coordination of one of the two crystallographically independent Cs sites

Neue ternäre Alkaliphosphide mit Kupfer, Zink und Cadmium: K2CuP, NaZnP und K4CdP2 / On New Ternary Alkali Metal Phosphides: K2CuP, NaZnP and K4CdP2

1985 ◽  
Vol 40 (11) ◽  
pp. 1419-1423 ◽  
Author(s):  
Brigitte Eisenmann ◽  
Mehmet Somer
Keyword(s):  
Alkali Metal ◽  
Structure Type ◽  
Crystallographic Data ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Metal Phosphides ◽  
New Compounds

The new compounds K2CuP, NaZnP and K4CdP2 have been prepared and structurally charac­terized. The crystallographic data are:K2CuP: orthorhombic, space group Cmcm (No. 63). Na2CuAs structure type with a = 983.9(5) pm. b = 739.7(4) pm, c = 579.5(3) pm. There are CuP2- zigzag chains, which are isosteric to the chains in HgO.NaZnP: tetragonal, space group P4/nmm (No. 129). PbFCl structure type with a = 406.6(2) pm. c = 689.3(3) pm, c/a = 1.695. K4CdP2: monoclinic, space group C2/m (No. 12). New structure type with a = 984.0(5) pm, b = 568.1(3) pm. c = 957.5(5) pm. β = 110.0(1)°. There are discrete [P−Cu−P]4- anions, which are isosteric to the HgCl2 molecules.

Two lithium tricyanomethanide compounds: syntheses and single-crystal structure determination of LiK[C(CN)3]2 and Li[C(CN)3]·½ (H3C)2CO

2015 ◽  
Vol 70 (3) ◽  
pp. 191-196 ◽  
Author(s):  
Olaf Reckeweg ◽  
Francis J. DiSalvo
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Structure Determination ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Cell Parameters ◽  
New Compounds

AbstractThe new compounds LiK[C(CN)3]2 and Li[C(CN)3]·½ (H3C)2CO were synthesized and their crystal structures were determined. Li[C(CN)3]·½ (H3C)2CO crystallizes in the orthorhombic space group Ima2 (no. 46) with the cell parameters a=794.97(14), b=1165.1(2) and c=1485.4(3) pm, while LiK[C(CN)3]2 adopts the monoclinic space group P21/c (no. 14) with the cell parameters a=1265.7(2), b=1068.0(2) and c=778.36(12) pm and the angle β=95.775(7)°. Single crystals of K[C(CN)3] were also acquired, and the crystal structure was refined more precisely than before corroborating earlier results.

Gemischte Alkalimetall-Oxidosulfidomolybdate A2[MoOxS4– x] (x = 1, 2, 3; A = K, Rb, Cs, NH4). Synthesen, Kristallstrukturen und Eigenschaften / Mixed Alkali Oxidosulfidomolybdates A2[MoOxS4−x] (x = 1, 2, 3; A = K, Rb, Cs, NH4).Synthesis, Crystal Structure and Properties

2012 ◽  
Vol 67 (2) ◽  
pp. 127-22
Author(s):  
Anna J. Lehner ◽  
Korina Kraut ◽  
Caroline Röhr
Keyword(s):  
Bathochromic Shift ◽  
Structure Type ◽  
Structure Theory ◽  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Coordination Numbers ◽  
Preparation Conditions ◽  
Vis Spectroscopy ◽  
Type Orthorhombic

Mixed sulfido/oxidomolybdate anions [MoOxS4−x]2− (x = 1, 2, 3) have been prepared by passing H2S gas through a solution of oxidomolybdates. The alkali salts of K+, Rb+, Cs+, and NH+4 precipitate as crystalline salts from these solutions depending on the pH, the polarity of the solvent, the educt concentrations and the temperature. Their structures have been determined by means of X-ray single-crystal diffraction data. All trisulfidomolybdates A2[MoOS3] (A = NH4/K/Rb/Cs) are isotypic with the tetrasulfido salts, exhibiting the β -K2[SO4] type (orthorhombic, space group Pnma, Z = 4; for A = Rb: a = 940.62(4), b = 713.32(4), c = 1164.56(5) pm, R1 = 0.0281). In contrast, the disulfidomolybdates exhibit a rich crystal chemistry, forming three different structure types depending on the preparation conditions and the size of the A cation: All four cations form salts crystallizing with the (NH4)2[WO2S2] structure type (monoclinic, space group C2/c, Z = 4, for A = Rb: a = 1144.32(11), b = 732.60(4), c = 978.99(10) pm, β = 120.324(7)°, R1 = 0.0274). For the three alkali metal cations a second polymorph with a new structure type (monoclinic, space group P21/c, Z = 4) is observed in addition (for A = Rb: a = 674.83(2), b = 852.98(3), c = 1383.10(9) pm, β = 115.19(1)°, R1 = 0.0216). The cesium salt also crystallizes with a third modification of another new structure type (orthorhombic, space group Pbcn, Z = 4, a = 915.30(6), b = 777.27(7), c = 1120.02(7) pm, R1 = 0.0350). Only for K, an anhydrous monosulfidomolybdate could be obtained (K2[MoO4] structure type, monoclinic, space group C2/m, Z = 4, a = 1288.7(3), b = 615.7(2), c = 762.2(1) pm, β = 109.59(1)°, R1 = 0.0736). The intramolecular chemical bonding in the molybdate anions is discussed and compared with the respective vanadates. Hereby aspects like bond lengths, bond strengths and force constants derived from Raman spectroscopy, are taken into account. Especially for the polymorphic disulfido salts, in-depth analyses of the local coordination numbers and the packing of the ions are presented. The gradual bathochromic shift of the crystal color with increasing S content and increasing size of the counter cations A and molar volumes (for the polymorphic forms), respectively, is in accordance with the increase of the experimental (UV/Vis spectroscopy) and calculated (FP-LAPW band structure theory) band gaps.

CaAgxZn1– x: Zwischen CrB- und FeB-Strukturtyp – Eine Studie zu elektronischen Einflüssen auf die Stapelung von Zick-Zack-Ketten in polaren Erdalkalimetall-Monometalliden / CaAgxZn1−x: Between CrB and FeB Structure Type – A Study on Electronic Factors Influencing the Stacking of Zig-zag Chains in Polar Alkaline Earth Monometallides

2009 ◽  
Vol 64 (10) ◽  
pp. 1127-1142 ◽  
Author(s):  
Wiebke Harms ◽  
Viktoria Mihajlov ◽  
Marco Wendorff ◽  
Caroline Röhr
Keyword(s):  
Alkaline Earth ◽  
Valence Electron ◽  
Computational Study ◽  
Structure Type ◽  
Binary Compound ◽  
Monoclinic Space Group ◽  
Stacking Sequence ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Type Orthorhombic

Depending on both electronic (valence electron numbers) and geometric (atom size ratios) characteristics of the contributing elements, the 1 : 1 compounds AIIM of the heavier alkaline earth elements A and electron-rich transition metals M form the well known CrB or FeB structure types. Both structure types exhibit M zig-zag chains, which are stacked in different orientations. In systematic studies of the pseudo-binary section CaAgxZn1−x four new ternary phases with different stacking variants between the CrB (cubic stacking, c) and the FeB (hexagonal stacking, h2) structure type have been prepared and characterized on the basis of single crystal X-ray data. Starting from CaAg (CrB type, orthorhombic, space group Cmcm, a = 405.22(7), b = 1144.7(2), c = 464.43(11) pm, Z = 4, R1 = 0.0197), up to 24% of Ag (CaAg0.76Zn0.24: a = 408.6(2), b = 1144.3(5), c = 460.7(2) pm, R1 = 0.0208) can be substituted by zinc without a change in the structure type. Close to the 1 : 1 ratio of Ag and Zn, the HT-TbNi structure type with the stacking sequence (hc2)2, i. e. 33% hexagonality (CaAg0.52Zn0.48: orthorhombic, space group Pnma, a = 2345.47(6), b = 454.370(10), c = 609.950(10) pm, Z = 12, R1 = 0.0298) is formed, followed by the SrAg type with 50% hexagonality (CaAg0.48Zn0.52: orthorhombic, space group Pnma, a = 1571.0(2), b = 451.50(7), c = 609.80(9) pm, Z = 8, R1 = 0.0733). The amount of hexagonal stacking is further increased with increasing Zn content in CaAg0.33Zn0.67 (Gd0.7Y0.3 structure type, h2c stacking, 67% hexagonality, monoclinic, space group P21/m, a = 610.39(9), b = 448.53(5), c = 1195.7(2) pm, β = 96.829(14)◦, Z = 3, R1 = 0.0221). Finally, a pure hexagonal stacking sequence, i. e. the FeB structure type (orthorhombic, space group Pnma, Z = 4) is observed from CaAg0.14Zn0.86 (a = 804.57(2), b = 443.050(10), c = 611.350(10) pm, R1 = 0.0131) to CaAg0.06Zn0.94 (a = 806.1(3), b = 441.0(2), c = 610.4(3) pm, R1 = 0.0255). Intriguingly, the series ends with the binary compound CaZn, which again crystallizes with the CrB structure type exhibiting cubic stacking of the zig-zag chains only (0% hexagonality). In an accompanying computational study, the chemical bonding in the series Ca(Ge/Ga/Zn/Ag) of isotypic binary metallides with variable valence electron numbers has been analyzed using FP-LAPW band structure methods. The electronic structures of the two border stacking variants are compared using the crystal data of CaZn (CrB type) and CaAg0.06Zn0.94 (FeB type). Geometrical and electronic criteria are used to compare and discuss the stability ranges of the different stacking variants inbetween the CrB and the FeB structure type found in polar intermetallic 1 : 1 phases.

scholarly journals Crystal structure of poly[tetra-μ-chlorido-tetrachloridobis(μ3-4,4′-bi-1,2,4-triazole-κ3 N 1:N 2:N 1′)(μ-4,4′-bi-1,2,4-triazole-κ3 N 1:N 1′)tetracopper(II)]

2019 ◽  
Vol 75 (6) ◽  
pp. 800-803
Author(s):  
Kostiantyn V. Domasevitch ◽  
Andrey B. Lysenko
Keyword(s):  
Crystal Structure ◽  
Coordination Polymer ◽  
Three Dimensional ◽  
Orthorhombic Space Group ◽  
Coordination Polyhedra ◽  
Space Group ◽  
Axis Direction ◽  
Metal Atoms ◽  
Triazole Ligand ◽  
Left And Right

The title Cu2+–chloride coordination polymer with the 4,4′-bi-1,2,4-triazole ligand (btr), [Cu4Cl8(C4H6N6)3] n , crystallizes in the non-centrosymmetric orthorhombic space group Fdd2. The two independent Cu2+ cations adopt distorted square-pyramidal geometries with {Cl2N2+Cl} coordination polyhedra. The metal atoms are bridged by μ-Cl anions forming left- and right-handed helical chains of sequence [–(μ-Cl)CuCl–] n along the c-axis direction. In the perpendicular directions, the btr ligands act in μ- and μ 3– coordination modes in a 2:3 ratio. The μ-btr bridges connect neighboring helices of the same handedness, whereas the μ 3-btr ligands link the helices of opposite handedness, leading to a racemic three-dimensional framework. The structure is consolidated by weak C—H...Cl and C—H...N interactions.

Ba5(Al/Ga)5(Sn/Pb): Neue Verbindungen an der Zintl-Grenze / Ba5(Al/Ga)5(Sn/Pb): New Compounds at the Zintl Border

2006 ◽  
Vol 61 (7) ◽  
pp. 846-853 ◽  
Author(s):  
Kristin Guttsche ◽  
Angela Rosin ◽  
Marco Wendorff ◽  
Caroline Röhr
Keyword(s):  
Structure Type ◽  
Intermetallic Phases ◽  
Zintl Phases ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Ternary Compounds ◽  
Maximum Temperatures ◽  
New Compounds ◽  
Type Orthorhombic ◽  
Structural Aspects

The new isotypic intermetallic phases Ba5MIII5MIV (MIII = Al, Ga; MIV = Sn, Pb) have been synthesized from stoichiometric amounts of the elements at maximum temperatures of 900 to 1000 ◦C. They crystallize in the hexagonal space group P6̄m2 (Ba5Al5Sn: a = 605.05(8), c = 1109.0(2) pm, R1 = 0.0137; Ba5Ga5Sn: a = 599.45(5), c = 1086.00(7) pm, R1 = 0.0485; Ba5Al5Pb: a = 606.9(2), c = 1112.0(4) pm, R1 = 0.0409 and Ba5Ga5Pb: a = 601.76(7), c = 1091.51(13) pm, R1 = 0.0295), forming a new structure type. Similar to the Zintl phases Ba2MIV (Co2Si structure type, orthorhombic, space group Pnma; Ba2Sn: a = 861.52(14), b = 569.85(9), c = 1056.9(2) pm, R1 = 0.0217 and Ba2Pb: a = 865.12(13), b = 569.1(2), c = 1061.8(2) pm, R1 = 0.0470), these new ternary phases contain isolated MIV atoms (coordinated by 11 Ba atoms). In addition, sheets of 3- and 4-bonded Al/Ga atoms similar to those in Ba3Al5 are present. In accordance with this, a formal subdivision of Ba5MIII5MIV into Ba3MIII5 ・ Ba2MIV can be performed to describe the observed intergrowth or chemical twinning of two different binary intermetallics to give the new ternary compounds. Beyond structural aspects, also the nature of the chemical bonding (as studied by FP-LAPW calculations) in these new, non-electron precise compounds in the vicinity of the Zintl border can be interpreted in this vein.

Cs3NdSi8O19 und Cs6Nd2Si21O48: Zwei cäsiumhaltige Oxosilicate des Neodyms im Vergleich / Cs3NdSi8O19 and Cs6Nd2Si21O48: Two Caesium-containing Oxosilicates of Neodymium in Comparison

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1329-1338 ◽  
Author(s):  
Marion C. Schäfer ◽  
Thomas Schleid
Keyword(s):  
Solid State ◽  
Coordination Sphere ◽  
Quaternary System ◽  
Three Dimensional ◽  
Single Layer ◽  
Solid State Reactions ◽  
Double Layers ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
First Case

In the quaternary system Cs / Nd / Si / O, two new representatives, the phyllo-oxosilicate Cs3NdSi8O19 and the tecto-oxosilicate Cs6Nd2Si21O48, were synthesized by CsF-flux-supported solid-state reactions between Nd2O3 and SiO2. The first one, Cs3NdSi8O19 (orthorhombic, Cmcm (no. 63), a = 705.74(5), b = 2712.85(19), c = 1163.72(8) pm, Z = 4), is not isotypic to the related scandium compound Cs3ScSi8O19. The [SiO4]4− tetrahedra (d(Si4+ -O2−) = 156 -163 pm) in the structure of Cs3NdSi8O19 are connected via common corners to form corrugated, loop-branched double layers containing four- and eight-membered rings in the (010) plane and eight-membered rings along [001]. Each of the eight-membered ellipses emerging along [100] is additionally loopbranched by two four-membered chains. The oxosilicate double layers are cross-linked by vertexsharing via otherwise isolated [NdO6]9− octahedra (d(Nd3+-O2-)= 232 - 234 pm) to build up a three-dimensional framework. Also in between the oxosilicate double layers, the (Cs1)+ cations are located on the 8 f site. Each of the octagonal channels along [001] hosts one (Cs3)+ and two (Cs2)+ cations, which both reside at only partially occupied sites (8g and 8 f , respectively) and disorder, because otherwise too short Cs+ ・ ・ ・ Cs+ distances would occur. The second compound, Cs6Nd2Si21O48, crystallizes also in an orthorhombic space group (Pmmn (no. 59), a = 2189.24(15), b = 731.92(5), c = 1593.61(11) pm, Z = 2). Starting from a loop-branched single layer containing five- and eight-membered rings, a three-dimensional framework of vertex-shared [SiO4]4− tetrahedra (d(Si4+-O2−) = 149 - 164 pm) built up, in which the Si-O distances range from 149 to 164 pm within a broad range. In certain cavities, one kind of Nd3+, but four kinds of Cs+ cations (here, all sites with full occupation) are embedded. Also surrounded by only six O2− anions just like in the first case, the Nd3+ cations (d(Nd3+-O2−) = 233 - 237 pm) exhibit an unusually small, but not unknown coordination sphere for this relatively large lanthanoid(III) cation

Ein neues kationenreiches Oxogallat Zur Kenntnis von K2Li3GaO4/A New Cation Rich Oxogallate About K2Li3GaO4

1983 ◽  
Vol 38 (2) ◽  
pp. 130-138 ◽  
Keyword(s):  
Graph Theory ◽  
Single Crystals ◽  
Structure Type ◽  
Monoclinic Space Group ◽  
Compound K ◽  
Coordination Polyhedra ◽  
Space Group ◽  
Binary Oxides ◽  
Coordination Polyhedrons

Abstract The new compound K2Li3GaO4 was prepared from binary oxides (powder) and from LiGaO2/KO0.48 (colourless transparent single crystals) in a closed Ag cylinder at 600 °C. It crystallizes in the monoclinic space group P21/c with the constants a = 553.6(2) 6 = 880.4(3) c = 1093.1(4) pm β = 111.52(3)°. Z = 4, drö = 3.017 and dpyk = 2.97 g·cm-3 . [4-circle diffractometer data, 1333 I0 (hkl), Mo-Ka, R = 4.95 and Rw = 5.04%, anisotropic refinement.] The new structure type is complicated. The characteristical features are shown using Schlegel projections of the coordination polyhedrons. Extended Schlegel Diagrams, a novel application of graph theory, are used. They describe bijective how the coordination polyhedra are three-dimensionally combined.

Zur Kenntnis der Selenidosilikate und -germanate Na4Si4Se10, Na2GeSe3 und Na8Ge4Se10 / On the Selenidosilicates and Germanates Na4Si4Se10, Na2GeSe3 and Na8Ge4Se10

1985 ◽  
Vol 40 (4) ◽  
pp. 450-457 ◽  
Author(s):  
Brigitte Eisenmann ◽  
Jendy Hansa ◽  
Herbert Schafer
Keyword(s):  
Monoclinic Space Group ◽  
Orthorhombic Space Group ◽  
Common Edge ◽  
Space Group ◽  
New Compounds

The following new compounds have been prepared and structurally characterized: Na4Si4Se10: orthorhombic, space group Cmcm (No. 63). a = 1340.9(5) pm, b = 1318.4(5) pm, c = 1086.5(4) pm, Z = 4. ρx = 3.44 g/cm3, ρexp = 3.47 g/cm3. The compound crystallizes in the Na4Si4S10 type with adamantane analogous Si4Se104- anions.Na2GeSe3: Monoclinic, space group P21/c (No. 14). a = 709.7(2) pm, b = 1606.8(5) pm, c = 607.3(2) pm, β = 113.69(8)°, Z = 4, ρx = 3.72 g/cm3, ρexp = 3.76 g/cm3. The compound is isotypic with Na2GeS3. GeSe4-tetrahedra are connected by common corners to infinite “Zweiereinfach” chains.Na8Ge4Se10: monoclinic, space group P21/c (No. 14). a = 1310.4(5) pm, b = 1205.7(5) pm, c = 1410.1(5) pm, β = 92.9(1)°, Z = 4, ρx = 3.77 g/cm3, ρexp = 3.75 g/cm3. Analogous to Na8Ge4Te10 (mod. I), two octahedral Ge2Se6 - units are connected by a common edge to a Ge4Se108-“ - anion.

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