data_NaAl2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.17
_cell_length_b   4.17
_cell_length_c   4.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NaAl2Ge
_chemical_formula_sum   'Na1 Al2 Ge1'
_cell_volume   75.6
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na3  1  0.0  0.0  0.0  1.0
  Al  Al0  1  0.0  0.09  0.17  1.0
  Al  Al1  1  0.09  0.0  0.17  1.0
  Ge  Ge2  1  0.09  0.09  0.0  1.0

data_NaAl2Ge
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.9
_cell_length_b   5.9
_cell_length_c   4.34
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   NaAl2Ge
_chemical_formula_sum   'Na2 Al4 Ge2'
_cell_volume   151.21
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Na  Na0  2  0.0  0.0  0.0  1.0
  Al  Al1  4  0.04  0.04  0.17  1.0
  Ge  Ge2  2  0.09  0.0  0.0  1.0

Na Al Al Ge
NaAl2Ge is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two NaAl2Ge clusters. Na(1) is bonded in a distorted single-bond geometry to two equivalent Al(1) and one Ge(1) atom. Both Na(1)-Al(1) bond lengths are 0.83 Å. The Na(1)-Ge(1) bond length is 0.51 Å. Al(1) is bonded in a 3-coordinate geometry to one Na(1), one Al(1), and one Ge(1) atom. The Al(1)-Al(1) bond length is 0.51 Å. The Al(1)-Ge(1) bond length is 0.83 Å. Ge(1) is bonded in a distorted single-bond geometry to one Na(1) and two equivalent Al(1) atoms.