data_CrCu2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.57
_cell_length_b   2.57
_cell_length_c   8.04
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CrCu2Ge
_chemical_formula_sum   'Cr1 Cu2 Ge1'
_cell_volume   53.09
_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
  Cr  Cr0  1  0.0  0.0  0.0  1.0
  Cu  Cu1  1  0.29  0.29  0.89  1.0
  Cu  Cu2  1  0.29  0.29  0.14  1.0
  Ge  Ge3  1  0.0  0.0  0.02  1.0

data_CrCu2Ge
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.63
_cell_length_b   3.63
_cell_length_c   8.04
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   CrCu2Ge
_chemical_formula_sum   'Cr2 Cu4 Ge2'
_cell_volume   106.17
_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
  Cr  Cr0  2  0.0  0.0  0.0  1.0
  Cu  Cu1  2  0.29  0.0  0.14  1.0
  Cu  Cu2  2  0.29  0.0  0.89  1.0
  Ge  Ge3  2  0.0  0.0  0.02  1.0

Cr Cu Cu Ge
Cr Cu Cu Ge 0 3 o o o 0 1 o o - 0 2 o o o 1 3 o o + 2 3 o o o 
CrCu2Ge crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two CrCu2Ge clusters. Cr(1) is bonded in a single-bond geometry to one Cu(1) and one Ge(1) atom. The Cr(1)-Cu(1) bond length is 1.36 Å. The Cr(1)-Ge(1) bond length is 0.14 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted single-bond geometry to one Cr(1) atom. In the second Cu site, Cu(2) is bonded in a distorted single-bond geometry to one Ge(1) atom. The Cu(2)-Ge(1) bond length is 1.45 Å. Ge(1) is bonded in a single-bond geometry to one Cr(1) and one Cu(2) atom.