data_TaSn2Br
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.11
_cell_length_b   5.11
_cell_length_c   5.11
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   TaSn2Br
_chemical_formula_sum   'Ta1 Sn2 Br1'
_cell_volume   94.59
_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  0.81  0.81  0.81  1.0
  Sn  Sn1  1  0.42  0.42  0.42  1.0
  Sn  Sn2  1  0.62  0.62  0.62  1.0
  Br  Br0  1  0.0  0.0  0.0  1.0

data_TaSn2Br
_symmetry_space_group_name_H-M   R3m
_cell_length_a   5.11
_cell_length_b   5.11
_cell_length_c   12.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   TaSn2Br
_chemical_formula_sum   'Ta3 Sn6 Br3'
_cell_volume   283.77
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.19  1.0
  Sn  Sn1  3  0.0  0.0  0.38  1.0
  Sn  Sn2  3  0.0  0.0  0.58  1.0
  Br  Br3  3  0.0  0.0  0.0  1.0

Ta Sn Sn Br
TaSn2Br crystallizes in the trigonal R3m space group. Ta(1) is bonded in a 2-coordinate geometry to one Sn(2), three equivalent Sn(1), and one Br(1) atom. The Ta(1)-Sn(2) bond length is 2.40 Å. All Ta(1)-Sn(1) bond lengths are 3.02 Å. The Ta(1)-Br(1) bond length is 2.40 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 7-coordinate geometry to three equivalent Ta(1), one Sn(2), and three equivalent Br(1) atoms. The Sn(1)-Sn(2) bond length is 2.40 Å. All Sn(1)-Br(1) bond lengths are 3.17 Å. In the second Sn site, Sn(2) is bonded in a 5-coordinate geometry to one Ta(1), one Sn(1), and three equivalent Br(1) atoms. All Sn(2)-Br(1) bond lengths are 3.02 Å. Br(1) is bonded in a distorted single-bond geometry to one Ta(1), three equivalent Sn(1), and three equivalent Sn(2) atoms.