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1Author    Z. NaturforschRequires cookie*
 Title    Die Kristallstrukturen von N a2CoFeF7 und einer zweiten Modifikation von Na2CuFeF7: Eine weitere Weberit-Variante  
 Abstract    The Crystal Structures o f N a2C o F e F 7 an d a Second M odification o f N a 2C u F e F 7: A n o th e r W eberite V arian t M atth ias W elsch u n d D ietrich Babel* The monoclinic weberites N a2C oF eF 7 (a = 1262.2(10), b = 736.0(4), c = 2451.6(20) pm, ß = 99.71(5)°) and a second modification o f N a 2C uFeF 7 (a = 1244.4(2), b = 734.3(1), c = 2467.2(5) pm, ß = 99.27(3)°), crystallize isotypically in space group C 2 /c, Z = 16. The structure is an intermediate type between orthorhombic and trigonal weberites, characterized by pairs ofpar-allel chains o f octahedra [MF4F2/2]3' (M = Co, Cu) which run in turn along [110] and [110]. The average distances are F e -F = 192 pm in the [FeF6]3~ octahedra o f both compounds. C on­ siderable splitting o f distances occurs in the [CoF6]4-octahedra (av. C o -F = 201 pm), and by Jahn-Teller distortion even more in those o f [CuFJ4-(av. C u -F = 199 pm). One o f the copper surroundings is (pseudo)tetragonally elongated (av sual splitting into three long and three short bonds Some structural relations are discussed. 
  Reference    Z. Naturforsch. 47b, 685—6 (1992); eingegangen am 1. Oktober 1991 
  Published    1992 
  Keywords    Crystal Structure, Weberite, Heptafluorodimetallates(II, III), Jahn-Teller Distortion 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0685.pdf 
 Identifier    ZNB-1992-47b-0685 
 Volume    47