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Synthesis and Structure of Two New Strontium Germanium Nitrides - Sr3Ge2N2 and Sr2GeN2
  We report the structures of two new strontium germanium nitrides synthesized as crystals from the elements in sealed Nb tubes at 750 C using liquid Na as a growth medium. Sr3Ge2N2 is isostructural with the previously reported Ba analogue. It crystallizes in P21/m (No. 11), with a = 9.032(2) Å, b = 3.883(1) Å, c = 9.648(2) Å and = 112.42(3), and has two formula units per unit cell. It contains GeN24- units and additionally Ge2- zigzag chains. Sr2GeN2 crystallizes in P42/mbc (No. 135) with a = b = 11.773(2) Å and c = 5.409(1) Å and has Z = 8. It also contains GeN24- units which have 18 valence electrons and, consequently are bent, like the isoelectronic molecule SO2.  
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  Synthesis and Structure of Two New Strontium Germanium Nitrides - Sr3Ge2N2 and Sr2GeN2.Simon J. Clarke, Glen R. Kowach, and Francis J. DiSalvo, Inorg. Chem. 1996, 35, 7009.