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1Author    W. S. SheldrickRequires cookie*
 Title    Das kantenverknüpfte tritetraedrische Selenostannat(IV)-Anion [Sn 3 Se 8 ] 4 . Darstellung und Struktur von K 4 Sn 3 Se 8 The Edge-bridged Tritetrahedral Selenostannate(IV) Anion [Sn 3 Se 8 ] 4-. Preparation and Structure of K 4 Sn 3 Se 8  
 Abstract    The potassium selenostannate(IV) K4Sn3Ses has been prepared by methanolothermal reaction of K2C03 with elemental Sn and Se at 190 °C and its structure established by X-ray structural analysis. The unit cell contains isolated [Sn3Se8] 4-anions consisting of a central SnSe4-tetrahedron edge-bridged to two further tetrahedra. Crystallographic D2-symmetry is observed for these an-ions. The four-membered rings are markedly distorted with Sn —Se bond distances of 2.520(1) to the central tin atom as compared to long Sn-Se distances of 2.622(1) Ä to the tin atoms of the outer tetrahedra. The terminal Sn —Se bonds have a length of 2.473(1) Ä. 
  Reference    Z. Naturforsch. 43b, 249—252 (1988); eingegangen am 30. November 1987 
  Published    1988 
  Keywords    Potassium Selenostannate(IV), Methanolothermal Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0249.pdf 
 Identifier    ZNB-1988-43b-0249 
 Volume    43 
2Author    W. S. Sheldrick, B. SchaafRequires cookie*
 Title    Schichtstruktur £, [Te6~] RbTe6, a Polytelluride with Layer Structure ^,[Te6_]  
 Abstract    Reaction of Rb2C 0 3 with Te in M ethanol at 160 °C in the presence of G e yields the polytellu­ ride RbTe6, the structure o f which has been deter­ mined by X-ray structural analysis. The poly­ anions (£,[Te6~] contain Te6 rings with a chair conformation, which are connected via four T e-T e bonds into a layer structure. A T structure is exhibited by the resulting TeTe3 units. The Rb cations adopt positions betw een neighbouring parallel anion layers and are surrounded by 12 Te atoms in their first coordination sphere. 
  Reference    Z. Naturforsch. 49b, 993—9 (1994) 
  Published    1994 
  Keywords    Rubidium Polytelluride, Methanolothermal Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0993_n.pdf 
 Identifier    ZNB-1994-49b-0993_n 
 Volume    49 
3Author    M. Wachhold, W. S. SheldrickRequires cookie*
 Title    Methanolothermale Synthese von Cs4As2Te6, des ersten Alkalimetall- Telluridoarsenats mit As-As-und Te-Te-Bindungen Methanolothermal Synthesis of Cs4As2Te6, the First Alkali Metal Telluridoarsenate with As-As and Te-Te Bonds  
 Abstract    Reaction of Cs2C 0 3 and As2Te3 in methanol at 145°C affords the telluridoarsenate(II) Cs4As2Te(,. A trans conformation is observed for the centrosymmetric As2Te^~ anions, which consist of two t/>-tetrahedralo As(As)(Te2)Te units with a common As-As bond. The terminal As-Te distance of 2.554(2) A is much shorter than the As-Te distance of 2.691(2) A to the Te2 unit, which exhibits a Te-Te bond length of 2.744(2) A. Both of the independent cations are coordinated in an irregular manner by eight Te atoms. 
  Reference    Z. Naturforsch. 51b, 1235—1239 (1996); eingegangen am 29. April 1996 
  Published    1996 
  Keywords    Cesium, Telluridoarsenate(II), Methanolothermal Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1235.pdf 
 Identifier    ZNB-1996-51b-1235 
 Volume    51 
4Author    M. Wachhold, W. S. SheldrickRequires cookie*
 Title    Methanolothermale Synthese von Rb3AsSe4 * 2 Se6 und Cs3AsSe4 * 2 Cs2As2Se4 * 6 Te4Se2, zwei Selenidoarsenate mit sechsgliedrigen Chalkogenringen Methanolothermal Synthesis o f Rb3A sSe4 * 2 Se6 and Cs3AsSe4 * 2 Cs2A s2Se4 * 6 Te4Se2. Two Selenidoarsenates with Six-Membered Chalcogen Rings  
 Abstract    The methanolothermal reaction of Rb2C 0 3 with As2Se3 and black selenium leads to the formation of Rb3AsSe4 and the new selenidoarsenate(V) Rb3AsSe4 • 2 Se6 (1), which crys­ 
  Reference    Z. Naturforsch. 52b, 169—175 (1997); eingegangen am 29. Juli 1996 
  Published    1997 
  Keywords    Selenium, Tellurium, Ring Systems, Selenidoarsenate, Methanolothermal Synthesis 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0169.pdf 
 Identifier    ZNB-1997-52b-0169 
 Volume    52 
5Author    W. S. Sheldrick, B. SchaafRequires cookie*
 Title    Ditelluridogermanaten(IV) der Alkalimetalle K -C s M ethanolotherm al Synthesis and Crystal Structure of Diselenido-and Ditelluridogerm anates(IV ) of the Alkali Metals K -C s  
 Abstract    Methanolothermal reaction of M2C 0 3 (M = K, Rb) with Ge and Se yields respectively the diselenidogerm anates(IV) K2G eS e4 and Rb2G eSe4, both of which contain chain anions ro[GeSe42_] in which G eS e4 tetrahedra are linked via S e -S e bonds. A similar structural principle is found in the ditelluridogermanates(IV) Rb2GeTe4 and Cs2GeTe4, prepared by reaction of M2C 0 3 (M = Rb, Cs) with Ge and Te in methanol at temperatures o f respectively 200 and 160 °C. The effect of cation size on the chain conformation is discussed. Rb4G e4S eU)CH3O H , which is formed together with Rb2G eSe4, exhibits isolated anions [G e4S e 10]4_ with an adamantane-like structure. Methanolothermale Synthese und Kristallstruktur von Diselenido-und 
  Reference    Z. Naturforsch. 50b, 1469—1475 (1995); eingegangen am 31. März 1995 
  Published    1995 
  Keywords    Selenidogerm anates(IV ), Telluridogermanates(IV), Alkali Cations, Methanolothermal Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1469.pdf 
 Identifier    ZNB-1995-50b-1469 
 Volume    50