data_Na2CrGe
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.66
_cell_length_b   2.66
_cell_length_c   10.3
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na2CrGe
_chemical_formula_sum   'Na2 Cr1 Ge1'
_cell_volume   72.96
_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  Na2  1  0.33  0.33  0.7  1.0
  Na  Na3  1  0.33  0.33  0.6  1.0
  Cr  Cr0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.0  0.0  0.15  1.0

data_Na2CrGe
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.76
_cell_length_b   3.76
_cell_length_c   10.3
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Na2CrGe
_chemical_formula_sum   'Na4 Cr2 Ge2'
_cell_volume   145.91
_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  0.33  0.0  0.6  1.0
  Na  Na1  2  0.33  0.0  0.7  1.0
  Cr  Cr2  2  0.0  0.0  0.0  1.0
  Ge  Ge3  2  0.0  0.0  0.15  1.0

Na Na Cr Ge
Na Na Cr Ge 0 1 o o o 2 3 o o o 
(Na)2CrGe crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two disodium molecules and two CrGe clusters. In each CrGe cluster, Cr(1) is bonded in a single-bond geometry to one Ge(1) atom. The Cr(1)-Ge(1) bond length is 1.55 Å. Ge(1) is bonded in a single-bond geometry to one Cr(1) atom.