data_CuGe3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.81
_cell_length_b   5.81
_cell_length_c   4.75
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuGe3
_chemical_formula_sum   'Cu2 Ge6'
_cell_volume   138.63
_cell_formula_units_Z   2
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
  Cu  Cu0  1  0.9  0.68  0.56  1.0
  Cu  Cu1  1  0.0  0.35  0.19  1.0
  Ge  Ge2  1  0.4  0.16  0.56  1.0
  Ge  Ge3  1  0.6  0.16  0.56  1.0
  Ge  Ge4  1  0.0  0.74  0.56  1.0
  Ge  Ge5  1  0.5  0.87  0.19  1.0
  Ge  Ge6  1  0.3  0.87  0.19  1.0
  Ge  Ge7  1  0.9  0.29  0.19  1.0

data_CuGe3
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.75
_cell_length_b   5.81
_cell_length_c   5.81
_cell_angle_alpha   120.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   CuGe3
_chemical_formula_sum   'Cu2 Ge6'
_cell_volume   138.63
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Cu  Cu0  2  0.19  0.45  0.66  1.0
  Ge  Ge1  2  0.19  0.15  0.15  1.0
  Ge  Ge2  2  0.19  0.55  0.72  1.0
  Ge  Ge3  2  0.19  0.95  0.15  1.0

Cu Cu Ge Ge Ge Ge Ge Ge
Ge3Cu crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of two ge2h6 molecules and two CuGe clusters. In each CuGe cluster, Cu(1) is bonded in a single-bond geometry to one Ge(3) atom. The Cu(1)-Ge(3) bond length is 0.49 Å. Ge(3) is bonded in a single-bond geometry to one Cu(1) atom.