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1995 (1)
1Author    Z. NaturforschRequires cookie*
 Title    In2.24(NCN)3 and NaIn(NCN)2: Synthesis and Crystal Structures of New Main Group Metal Cyanamides  
 Abstract    Single crystals of In2.24(N C N)3 and N aIn(N C N)2 can be synthesized from a reaction be­ tween InBr and NaCN at 400 °C, followed by chemical transport at 4 0 0 -5 0 0 °C. The X-ray crystal structure determinations of In2.24(N C N)3 (rhombohedral R 3c, a = 606.09(4), c -2884.4(2) pm, Z = 6) and N aIn(N C N)2 (orthorhombic Cmcm, a = 961.30(6), b = 716.84(5), c = 603.65(4) pm, Z = 4) reveal ionic layer structures built from sheets of cationic and anionic (cyanamide) motifs. While N aIn(N C N)2 contains In3+ and N a+ ions, In2 24(N C N)3 is a mixed-valence compound, incorporating a m onovalent In+ ion besides trivalent indium. The N CN 2~ units of both In2,24(N C N)3 and N aIn(N C N)2 reflect perfect D xll point group symmetry within the limits of experimental accuracy. Furthermore, an evaluation of all presently available crystallographic data on metal cyanamide crystal structures manifests that there is no evi­ dence for a non-centrosymmetric description o f any of these. Likewise, we propose an alter­ native centrosymmetric structural model for lead cyanamide, PbNCN, and question the evi­ dence of the unsymmetrical, non-D xh shaped cyanamide anion in the latter structure. 
  Reference    Z. Naturforsch. 50b, 1245—1251 (1995); received April 11 1995 
  Published    1995 
  Keywords    Indium Cyanamide, Indium Sodium Cyanamide, Crystal Structure, Cyanamide Molecular Symmetry 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1245.pdf 
 Identifier    ZNB-1995-50b-1245 
 Volume    50