data_Cu2GeAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.01
_cell_length_b   5.01
_cell_length_c   5.01
_cell_angle_alpha   135.1
_cell_angle_beta   135.1
_cell_angle_gamma   65.37
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2GeAs
_chemical_formula_sum   'Cu2 Ge1 As1'
_cell_volume   61.55
_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
  Cu  Cu1  1  0.0  0.0  0.0  1.0
  Cu  Cu2  1  0.91  0.0  0.11  1.0
  Ge  Ge3  1  0.0  0.0  0.21  1.0
  As  As0  1  0.0  0.91  0.11  1.0

data_Cu2GeAs
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.82
_cell_length_b   3.82
_cell_length_c   5.01
_cell_angle_alpha   112.45
_cell_angle_beta   112.45
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2GeAs
_chemical_formula_sum   'Cu2 Ge1 As1'
_cell_volume   61.55
_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
  Cu  Cu0  1  0.0  0.0  0.0  1.0
  Cu  Cu1  1  0.89  0.0  0.8  1.0
  Ge  Ge2  1  0.79  0.0  0.79  1.0
  As  As3  1  0.8  0.91  0.8  1.0

Cu Cu Ge As
Cu2GeAs is Indium-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one Cu2GeAs cluster. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a 2-coordinate geometry to one Cu(2) and one As(1) atom. The Cu(1)-Cu(2) bond length is 0.90 Å. The Cu(1)-As(1) bond length is 0.90 Å. In the second Cu site, Cu(2) is bonded in a 2-coordinate geometry to one Cu(1), one Ge(1), and one As(1) atom. The Cu(2)-Ge(1) bond length is 0.38 Å. The Cu(2)-As(1) bond length is 0.48 Å. Ge(1) is bonded in a distorted L-shaped geometry to one Cu(2) and one As(1) atom. The Ge(1)-As(1) bond length is 0.38 Å. As(1) is bonded in a 3-coordinate geometry to one Cu(1), one Cu(2), and one Ge(1) atom.