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'Chalcogen Halogen Compounds' in keywords
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1979 (2)
1Author    Bernt Krebs, Volker PaulatRequires cookie*
 Title    Darstellung und Eigenschaften trimerer Chlorotellurate(IV). Kristallstruktur von (CßHg^CTegCl^  
 Abstract    The trimeric chlorotellurate(IV) ion Te3Cli3~ is obtained in benzene solution as a degradation product of cubane-like tetrameric tellurium(IV) chloride Te4Cli6 and can be isolated by crystallization in the form of salts with large cations. The crystal structure of the triphenyl-methyl salt (CeHs^CTesClis (P2x/c, a = 1109.5, b = 1644.4, c = 2043.9 pm, ß = 114.50°) shows the Te3Cli3 _ ion to have approximate C3V symmetry; as a fragment of the Te4Cli6 cube it consists of three edge-sharing octahedra with a central triply bridging Cl. Bond distances Te-Cl (tripl.br.) 292.4-298.4, Te-Cl (doubl.br.) 270.6-286.3, Te-Cl (term.) 232.0-238.8 pm. The vibrational spectrum of Te3Cli3~ is discussed. 
  Reference    Z. Naturforsch. 34b, 900—905 (1979); eingegangen am 2. April 1979 
  Published    1979 
  Keywords    Chlorotellurates(IV), Chalcogen Halogen Compounds, Inert Electron Pair, Crystal Structure 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0900.pdf 
 Identifier    ZNB-1979-34b-0900 
 Volume    34 
2Author    Bernt Krebs, Michael HeinRequires cookie*
 Title    (H502)2SeBr6 4H20 Solvated Halogeno-Chalcogen(IV) Acids, I Preparation and Structure of the Hexabromoselenium(IV) Acid Hydrate (Hs02)2SeBr6 * 4H20  
 Abstract    Hexabromoselenium(IV) acid with the stoichiometric composition H2SeBr6 • 8 H20 is prepared from solutions of SeBr* in concentrated aqueous HBr. If separated from the solution, the crystalline compound is stable only at low temperatures. A single crystal X-ray structure analysis at —100 °C (monoclinic, C2/m, a — 1039.4(5), b = 1028.8(4), c = 836.6(3) pm, ß = 104.11(4)°) shows the acid to contain, besides regular octahedral SeBr6 2 -ions (Se-Br: 255.3(2)-257.9(2) pm), H502+ hydronium ions (0--0: 255(2) pm). The remaining H20 molecules are involved in a hydrogen bond system with O-O: 264(2)-275(2) pm andO-Br: 342(1), 351(1) pm. The formula has to be written as (H502)2SeBr6 • 4 H20. 
  Reference    Z. Naturforsch. 34b, 1666—1670 (1979); eingegangen am 30. Juli 1979 
  Published    1979 
  Keywords    Hexabromoselenium(IV) Acid, Chalcogen Halogen Compounds, Crystal Structure, Hydronium Compounds 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1666.pdf 
 Identifier    ZNB-1979-34b-1666 
 Volume    34