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1Author    K. Urt, O. KleppRequires cookie*
 Title    Preparation and Crystal Structure of Na4TiSe4. A Selenotitanate with Discrete Tetrahedral Anions  
 Abstract    Red crystals of Na4TiSe4 were obtained by reacting an intimate mixture of Na2Se, Ti and Se at 750°C. Na4TiSe4 is monoclinic, space group I2/a with a = 24.027(6), b = 7.346(4), c = 21.572(6) A, (3 = 104.52(2)°, Z = 16. Its crystal structure was determined from diffractometer data (AgK a-radiation) and refined to a conventional R of 0.036 for 2673 F0's and 158 variables. The crystal structure is of a new type, characterized by the presence of discrete tetrahedral complex anions, [TiSe,*]4" , which are arranged in slabs parallel to (100). The average Ti-Se bond length is 2.385(1) A. The Na+ cations are in different chalcogen environments with distorted octahedral, square pyramidal or planar configurations, respectively. 
  Reference    (Z. Naturforsch. 55b, 39—44 [2000]; received September 28 1999) 
  Published    2000 
  Keywords    Crystal Structure, Chalcogenides, Titanium, Sodium, Selenium 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0039.pdf 
 Identifier    ZNB-2000-55b-0039 
 Volume    55