LiSrGe2 and LiBaGe2: One-dimensional chains of ???1[ G e2 ]3 - in an unusual conformation

  • Gon Park D
  • Dong Y
  • DiSalvo F
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Two new isostructural intermetallic germanides, LiSrGe2 and LiBaGe2, were synthesized as single crystals from constituent elements in molten Na. They both crystallize in the space group Pnma (no. 62) with a = 7.142(1), b = 4.459(1), c = 11.550(2) ??, Z = 4, and a = 7.381(1), b = 4.617(1), c = 11.837(1) ??, Z = 4, for LiSrGe2 and LiBaGe2, respectively. They contain one-dimensional anionic germanide chains, ???1[ G e2 ]3 -, running along the a-axis. The chains are in an unusual zigzag-like conformation, with weakly alternating Ge-Ge bond lengths of 2.475(1) and 2.498(1) ??, and 2.473(1) and 2.525(1) ??, for LiSrGe2 and LiBaGe2, respectively. Extended H??ckel calculations suggest that LiSrGe2 is metallic: the Fermi level lies within bands having anti-bonding character. ?? 2008 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Intermetallics
  • X-ray diffraction
  • Zintl phases

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  • Dong Gon Park

  • Yongkwan Dong

  • Francis J. DiSalvo

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