Über Perowskite Ba2BBTeVIO6

On Perovskites Ba₂B B Te^VIO₆ Compounds of composition Ba₂BBTe^VIO₆ with B^I = Li, Na; B^III = La, Pr, Nd, Sm, Eu, Gd, Tb, Ho, Yb, Y, In, Sc crystallize in a cubic 1:1 ordered perovskite structure. The vibrational spectroscopic investigations show, that more species of TeO₆ octahedra are present in the lattice.     

Über KCuAIF6

On KCuAlF₆ KCuAlF₆ has been prepared for the first time as colourless single crystals [from powder, Au-tube, 700°C, 70 d]. It crystallizes in the orthorhombic crystal system with a = 673.1, b = 704.0, c = 979.3 pm (d_x = 3.49, d_pyk = 3.4 g = cm^?3) isotypic to CsAgFeF₆ (Pnma, Z = 4, 727 hkl; MoKα, R = 5.6, R_w = 4.4%). Parameters see in the text. Strikingly we observe compressed “octahedra” [CuF₆]. The compression (Δ = 11.6%) is nearly the same: CsAgFeF₆ (Δ = 9.7%). The Madelung Part of Lattice Energy, MAPLE (for hypothetic forms, too) is calculated and discussed.     

Über Hexagonale Perowskite mit Kationenfehlstellen. XI. Die Stapelvariante Ba6W4□2O18

On Hexagonal Perovskites with Cationic Vacancies. XI. Stacking Polytype Ba₆W₄□₂O₁₈ The white Ba₆W₄□₂O₁₈, with a cation/vacancy ratio of 2:1 for the octahedral holes, is the first representative of a new stacking polytype for this formula type. It crystallizes in a rhombohedral six layer-structure with a_hex = 10.13₀ Å c_hex = 13.96₀ Å Z = 3 (ρ_exp = 7.3₈ g/cm³; ρ_calc = 7.41₈ g/cm³).     

Über hexagonale Perowskite mit Kationenfehlstellen. XII. Strukturbestimmung an Ba6W4□2O18

On Hexagonal Perovskites with Cationic Vacancies. XII. Structure Determination on Ba₆W₄□₂O₁₈ The stacking polytype Ba₆W₄□₂O₁₈ is the first oxidic variant of the Cs₃Tl₂Cl₉-type. The structure determination gave for the space group R3 c with the sequence (h)₆, Z = 3, the refined, intensity related R′ value of 6.8%. The octahedral net consists of groups of two face sharing WO₆ octahedra (W₂O_6/2;O₆), which are in the (110) plane displaced against each other. In the doublé octahedra the tungsten atoms are shifted away from their ideal central position (W–W: 2.32₇ Å) with the result, that the W–W distance has increased to 2.90₅ Å.     

Über Hexagonale Perowskite mit Kationenfehlstellen. I. Verbindungen vom Typ Ba2B□2/3ReVIIO6

On Hexagonal Perovskites with Cationic Vacancies. I. Compounds of the Type Ba₂B □_2/3Re^VIIO₆ Compounds of Type Ba₂B□_2/3Re^VIIO₆ are formed with B^III = Sm? Gd Ho? Lu, Y, Sc, In (yellow); Tb (black-brown); Dy (yellow-orange). They crystallize with B^III = Sm? Lu, Y and Sc in a rhombohedral layer structure of 12 L-type (space group R3 m; sequence: cchhcchhcchh) with 6 formula units in the unit cell.     

Über neue Bufadienolide aus Ch'an Su. Über Krötengifte, 34. Mitteilung

Two new bufadienolides, isolated from Ch'an Su, are proved to be 19-oxo-cinobufagin (III) and 19-oxo-cinobufotalin (V), respectively.     

Über Perowskite der Zusammensetzung A2BUIVO6 mit A,B = Ba,Sr, Ca,Mg und Pb

On Perovskites of the Composition A₂BU^IVO₆ with A, B = Ba, Sr, Ca, Mg, and Pb The influence of the A und B ions on the charge transfer O → U are studied by diffuse reflectance measurements. They are completed by vibrational spectroscopic spectroscopic and structural investigations.     

Über die Verbindung Ca4PtO6

During the recovery of Pt from reaction products of the catalytic NH₃ oxidation by CaO filters a compound is formed, which has been described and structurell investigated as Ca₄PtO₆ by CZAYA¹).     

Über Osmiumbromide

On Osmiumbromides OsBr₄ was obtained by reaction of OsCl₄ with bromine in a closed system at 330°C and 120 bar Br₂ pressure. The compound crystallizes orthorhombic (a = 633.99(18) pm; b = 1 210.92(16) pm; c = 1 461.5(10) pm; Z = 8; space group Pbca) in a TcCl₄ type structure. OsBr₆ octahedra are connected by two common edges to \documentclass{article}\pagestyle{empty}\begin{document}${}_\infty ^1 \left[ {{\rm OsBr}_{{{\rm 2} \mathord{\left/ {\vphantom {{\rm 2} 1}} \right. \kern-\nulldelimiterspace} 1}} {\rm Br}_{{{\rm 4} \mathord{\left/ {\vphantom {{\rm 4} 2}} \right. \kern-\nulldelimiterspace} 2}} } \right]$\end{document} chains with a cis arrangement of the two non-bridging Br atoms. Mixed crystals OsBr_xCl_4?x(0 < x < 2.3) with CsCl₄ type structure are formed by reactions at lower Br₂ pressure up to 12 bar. They are built up from chains consisting of edge-sharing octahedra. The terminal atoms have a trans arrangement. Attempts to synthesize single crystals of OsBr₃ by decomposition of OsBr₄ resulted in formation of three different phases OsBr_x (3 < x < 4).     

Über Bismuthaltige Silicatapatite. Ungewöhnliche Oxidapatite

On Silicate Apatites Containing Bismuth. Unusual Oxide Apatites The compositions Ca_3,2Bi_6,8(SiO₄)₆O_1,4 □_0,6 and Sr_2,8Bi_7,2 (SiO₄)₆O_1,6□_0,4 have been ascertained for the thermally formed oxide apatites. The metastable apatite phase with a homogeneity range from Pb_5,2Bi_4,8(SiO₄)₆O_0,4 □_1,6 to Pb₆Bi₄(SiO₄)₆□₂ crystallizes from the glassy state below 600°C. The vacancies □ correspond to the unoccupied halide positions. Ca_3,2Bi_6,8(SiO₄)₆O_0,8 (OH)_1,2 (hydrothermal synthesis) and Pb₄Bi₆(SiO₄)₆F₂ show the usual stoichiometry, however. The peculiar electron configuration of Bi³⁺ and Pb²⁺ is considered responsible for the differences from apatites of La³⁺ and of the alkaline earth ions.     

Über hexagonale Perowskite mit Kationenfehlstellen. III Strukturbestimmungen an Verbindungen vom Typ Ba2B □2/3 ReVIIO6

On Hexagonal Perovskites with Cationic Vacancies. III. Structure Determination on Compounds of Type Ba₂B □_2/3 Re^VIIO₆ Compounds of Type Ba₂B □_2/3 Re^VIIO₆ with B^III = rare earth, Y. Sc, In belong to the group of hexagonal perovskite stacking polytypes. For B^III = Gd, Y structure determinations with powder data have been performed. The refined R′ factors are 9.11% for Ba₂Gd1/3□_2/3ReO₆ and 12.07% for Ba₂Y1/3□_2/3ReO₆. The structure represents a rhombohedral 12 L type (space group R3 m) with the sequence hhcchhcchhcc. The lattice contains groups of three octahedra connected by common faces which are linked together by a single octahedron via common vertices. In the block of three face-sharing octahedra the central octahedral lattice site is vacant and the two outer positions are occupied by the rhenium atoms. According to this distribution direct contact of occupied face-sharing octahedra is absent.     

Über Lanthanorthovanadat

Crystallographic data for LaVO₄ are given. Also the infrared and Raman spectra are reported and discussed with the aid of a “factor group analysis”.     

Über Pentafluorphenylthio-Metallkomplexe

The compounds M(CO)₅ · THF (M = Cr, Mo, W) react with sodium mercaptide, NaSR (R = C₆F₅, C₆H₅, C₂H₅), to give the mercapto-pentacarbonylmetallate anions [M(CO)₅ · · SR]^?. The preparation of some pentafluorophenylthio complexes, e. g. [(C₆H₅)₃P]₂MSC₆F₅(M = Cu, Ag, Au), [(C₆H₅)₃P]₂Hg(SC₆F₅)₂, is reported.