data_Cu2Ge
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.03
_cell_length_b   6.03
_cell_length_c   3.77
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   143.74
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2Ge
_chemical_formula_sum   'Cu4 Ge2'
_cell_volume   81.0
_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  0.88  0.0  0.88  1.0
  Cu  Cu1  1  0.0  0.0  0.0  1.0
  Cu  Cu2  1  0.88  0.91  0.0  1.0
  Cu  Cu3  1  0.88  0.09  0.0  1.0
  Ge  Ge4  1  0.88  0.93  0.88  1.0
  Ge  Ge5  1  0.88  0.07  0.88  1.0

data_Cu2Ge
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.75
_cell_length_b   3.77
_cell_length_c   6.03
_cell_angle_alpha   90.0
_cell_angle_beta   108.13
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2Ge
_chemical_formula_sum   'Cu4 Ge2'
_cell_volume   81.0
_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  0.0  0.0  0.0  1.0
  Cu  Cu1  1  0.0  0.12  0.12  1.0
  Cu  Cu2  1  0.09  0.0  0.21  1.0
  Cu  Cu3  1  0.91  0.0  0.03  1.0
  Ge  Ge4  1  0.07  0.12  0.2  1.0
  Ge  Ge5  1  0.93  0.12  0.05  1.0

Cu Cu Cu Cu Ge Ge
Cu Cu Cu Cu Ge Ge 0 5 o o o 0 4 o - o 1 2 - - o 2 4 o o - 3 5 o o - 
Cu2Ge is Indium-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one Cu2Ge cluster. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted linear geometry to one Ge(1) and one Ge(2) atom. The Cu(1)-Ge(1) bond length is 0.45 Å. The Cu(1)-Ge(2) bond length is 0.45 Å. In the second Cu site, Cu(2) is bonded in a distorted single-bond geometry to one Cu(3) atom. The Cu(2)-Cu(3) bond length is 0.44 Å. In the third Cu site, Cu(3) is bonded in a 1-coordinate geometry to one Cu(2) and one Ge(1) atom. The Cu(3)-Ge(1) bond length is 0.45 Å. In the fourth Cu site, Cu(4) is bonded in a 1-coordinate geometry to one Ge(2) atom. The Cu(4)-Ge(2) bond length is 0.45 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a water-like geometry to one Cu(1) and one Cu(3) atom. In the second Ge site, Ge(2) is bonded in a water-like geometry to one Cu(1) and one Cu(4) atom.