data_TaCrCu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.68
_cell_length_b   3.68
_cell_length_c   4.0
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaCrCu2
_chemical_formula_sum   'Ta1 Cr1 Cu2'
_cell_volume   54.22
_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
  Ta  Ta3  1  0.84  0.84  0.0  1.0
  Cr  Cr0  1  0.0  0.0  0.0  1.0
  Cu  Cu1  1  0.0  0.84  0.0  1.0
  Cu  Cu2  1  0.84  0.0  0.0  1.0

data_TaCrCu2
_symmetry_space_group_name_H-M   Amm2
_cell_length_a   4.0
_cell_length_b   5.2
_cell_length_c   5.2
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   38
_chemical_formula_structural   TaCrCu2
_chemical_formula_sum   'Ta2 Cr2 Cu4'
_cell_volume   108.45
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, z'
  3  '-x, y, z'
  4  'x, -y, z'
  5  'x, y+1/2, z+1/2'
  6  '-x, -y+1/2, z+1/2'
  7  '-x, y+1/2, z+1/2'
  8  'x, -y+1/2, z+1/2'
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
  Ta  Ta0  2  0.0  0.0  0.84  1.0
  Cr  Cr1  2  0.0  0.0  0.0  1.0
  Cu  Cu2  4  0.0  0.08  0.92  1.0

Ta Cr Cu Cu
TaCrCu2 is alpha Po structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two TaCrCu2 clusters. Ta(1) is bonded in an L-shaped geometry to two equivalent Cu(1) atoms. Both Ta(1)-Cu(1) bond lengths are 0.59 Å. Cr(1) is bonded in an L-shaped geometry to two equivalent Cu(1) atoms. Both Cr(1)-Cu(1) bond lengths are 0.59 Å. Cu(1) is bonded in an L-shaped geometry to one Ta(1) and one Cr(1) atom.