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1984 (1)
1Author    KurtO. Klepp, G. Ünther EulenbergerRequires cookie*
 Title    Darstellung und Kristallstruktur von Tl4TiS4, TI4SnS4 und Tl4TiSe4 Preparation and Crystal Structure of Tl4TiS4, Tl4SnS4, and Tl4TiSe4  
 Abstract    The isostructural com pounds Tl4TiS4, Tl4SnS4 and Tl4TiSe4 crystallize in the m onoclinic system , space group P2[/c with a — 8.328, b = 8.191, c — 15.248 Ä , ß = 104.53°; a = 8.395, b — 8.280, c — 15.398 Ä , ß = 103.69°, and a = 8.517, b = 8.389, c = 15.672 Ä , ß = 103.50°, respectively. There are four formula units in the unit cell. The crystal structures were determ ined and refined from single crystal diffractom eter data. They are characterized by isolated tetrahedral thioanions which are connected with each other by T l+ ions. The mean bond lengths are T i—S = 2.26 Ä , S n —S = 2.40 Ä and Ti —Se = 2.38 Ä . The T1 atoms are surrounded by six and seven chalcogen atom s, respectively, in an irregular and polar arrangement, thus indicating stereochem ical activity o f the lone electron pair o f the T l+ ions. T l -S distances vary from 2.93 to 3.98 Ä , T l—Se distances from 3.03 to 3.96 Ä . The Tl atom s have nearest Tl neighbours at distances ranging from 3.46 to 3.65 Ä . The crystal structure can be described as built from pseudotetragonal slabs oriented parallel to (001) which contain the cations and the tetrahedral anions. It is shown that a similar description is valid also for the crystal structures o f Tl4G eS4 [1] and N a4SnS4 [2, 3]. 
  Reference    Z. Naturforsch. 39b, 705 (1984); eingegangen am 27. Januar 1984 
  Published    1984 
  Keywords    Thallium Thiotitanate, Thallium Thiostannate, Thallium Selenotitanate, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0705.pdf 
 Identifier    ZNB-1984-39b-0705 
 Volume    39