data_TlCuGe2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.26
_cell_length_b   5.26
_cell_length_c   5.26
_cell_angle_alpha   131.53
_cell_angle_beta   131.53
_cell_angle_gamma   70.98
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlCuGe2
_chemical_formula_sum   'Tl1 Cu1 Ge2'
_cell_volume   79.74
_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
  Tl  Tl3  1  0.0  0.16  0.14  1.0
  Cu  Cu0  1  0.0  0.0  0.0  1.0
  Ge  Ge1  1  0.16  0.0  0.14  1.0
  Ge  Ge2  1  0.0  0.0  0.28  1.0

data_TlCuGe2
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.32
_cell_length_b   4.32
_cell_length_c   5.26
_cell_angle_alpha   114.24
_cell_angle_beta   114.24
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TlCuGe2
_chemical_formula_sum   'Tl1 Cu1 Ge2'
_cell_volume   79.74
_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
  Tl  Tl0  1  0.98  0.14  0.98  1.0
  Cu  Cu1  1  0.0  0.0  0.0  1.0
  Ge  Ge2  1  0.14  0.98  0.98  1.0
  Ge  Ge3  1  0.28  0.28  0.28  1.0

Tl Cu Ge Ge
CuTlGe2 is Indium-like structured and crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one CuTlGe2 cluster. Cu(1) is bonded in an L-shaped geometry to one Tl(1), one Ge(1), and one Ge(2) atom. The Cu(1)-Tl(1) bond length is 0.65 Å. The Cu(1)-Ge(1) bond length is 0.65 Å. The Cu(1)-Ge(2) bond length is 1.47 Å. Tl(1) is bonded in a distorted single-bond geometry to one Cu(1) and one Ge(2) atom. The Tl(1)-Ge(2) bond length is 1.43 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded in a single-bond geometry to one Cu(1) and one Ge(2) atom. The Ge(1)-Ge(2) bond length is 1.43 Å. In the second Ge site, Ge(2) is bonded in a 3-coordinate geometry to one Cu(1), one Tl(1), and one Ge(1) atom.