data_CuGe2As
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.6
_cell_length_b   5.6
_cell_length_c   5.6
_cell_angle_alpha   146.85
_cell_angle_beta   133.53
_cell_angle_gamma   58.26
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuGe2As
_chemical_formula_sum   'Cu1 Ge2 As1'
_cell_volume   69.1
_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
  Ge  Ge2  1  0.0  0.21  0.47  1.0
  Ge  Ge3  1  0.6  0.0  0.42  1.0
  As  As0  1  0.0  0.0  0.89  1.0

data_CuGe2As
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.2
_cell_length_b   4.42
_cell_length_c   5.6
_cell_angle_alpha   113.23
_cell_angle_beta   106.57
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuGe2As
_chemical_formula_sum   'Cu1 Ge2 As1'
_cell_volume   69.1
_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
  Ge  Ge1  1  0.0  0.42  0.82  1.0
  Ge  Ge2  1  0.79  0.26  0.26  1.0
  As  As3  1  0.0  0.89  0.89  1.0

Cu Ge Ge As
CuGe2As crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one CuGe2As cluster. Cu(1) is bonded in a single-bond geometry to one Ge(1) and one As(1) atom. The Cu(1)-Ge(1) bond length is 1.78 Å. The Cu(1)-As(1) bond length is 0.60 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a distorted single-bond geometry to one Cu(1) atom. In the second Ge site, Ge(2) is bonded in a distorted single-bond geometry to one As(1) atom. The Ge(2)-As(1) bond length is 1.96 Å. As(1) is bonded in a single-bond geometry to one Cu(1) and one Ge(2) atom.