The compound described by Cs2PbTa6Cl18 crystallizes in the trigonal R-3 space group. Cs(1) is bonded to three equivalent Cl(1), three equivalent Cl(2), and six equivalent Cl(3) atoms to form CsCl12 cuboctahedra that share corners with three equivalent Pb(1)Cl6 octahedra, corners with six equivalent Ta(1)Cl5 square pyramids, edges with three equivalent Cs(1)Cl12 cuboctahedra, edges with three equivalent Ta(1)Cl5 square pyramids, and faces with three equivalent Ta(1)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 56°. Ta(1) is bonded to one Cl(2), two equivalent Cl(1), and two equivalent Cl(3) atoms to form distorted TaCl5 square pyramids that share corners with two equivalent Cs(1)Cl12 cuboctahedra,  a cornercorner with one Pb(1)Cl6 octahedra, corners with four equivalent Ta(1)Cl5 square pyramids,  an edgeedge with one Cs(1)Cl12 cuboctahedra, and  a faceface with one Cs(1)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. Pb(1) is bonded to six equivalent Cl(2) atoms to form PbCl6 octahedra that share corners with six equivalent Cs(1)Cl12 cuboctahedra and corners with six equivalent Ta(1)Cl5 square pyramids. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Ta(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Cs(1), one Ta(1), and one Pb(1) atom. In the third Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Cs(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2Ta6PbCl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.515
_cell_length_b   10.515
_cell_length_c   10.515
_cell_angle_alpha   54.852
_cell_angle_beta   54.852
_cell_angle_gamma   54.852
_symmetry_Int_Tables_number   1
_cell_volume   723.518
_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
  Cs  Cs0  1  0.277  0.277  0.277  1.0
  Cs  Cs1  1  0.723  0.723  0.723  1.0
  Ta  Ta2  1  0.421  0.303  0.644  1.0
  Ta  Ta3  1  0.356  0.579  0.697  1.0
  Ta  Ta4  1  0.697  0.356  0.579  1.0
  Ta  Ta5  1  0.644  0.421  0.303  1.0
  Ta  Ta6  1  0.579  0.697  0.356  1.0
  Ta  Ta7  1  0.303  0.644  0.421  1.0
  Pb  Pb8  1  0.000  0.000  0.000  1.0
  Cl  Cl9  1  0.640  0.095  0.767  1.0
  Cl  Cl10  1  0.767  0.640  0.095  1.0
  Cl  Cl11  1  0.095  0.767  0.640  1.0
  Cl  Cl12  1  0.825  0.323  0.045  1.0
  Cl  Cl13  1  0.170  0.436  0.577  1.0
  Cl  Cl14  1  0.677  0.955  0.175  1.0
  Cl  Cl15  1  0.905  0.233  0.360  1.0
  Cl  Cl16  1  0.564  0.423  0.830  1.0
  Cl  Cl17  1  0.423  0.830  0.564  1.0
  Cl  Cl18  1  0.955  0.175  0.677  1.0
  Cl  Cl19  1  0.175  0.677  0.955  1.0
  Cl  Cl20  1  0.045  0.825  0.323  1.0
  Cl  Cl21  1  0.323  0.045  0.825  1.0
  Cl  Cl22  1  0.233  0.360  0.905  1.0
  Cl  Cl23  1  0.577  0.170  0.436  1.0
  Cl  Cl24  1  0.436  0.577  0.170  1.0
  Cl  Cl25  1  0.360  0.905  0.233  1.0
  Cl  Cl26  1  0.830  0.564  0.423  1.0
[/CIF]
.
The compound described by Cs2PbTa6Cl18 crystallizes in the trigonal R-3 space group. Cs(1) is bonded to three equivalent Cl(1), three equivalent Cl(2), and six equivalent Cl(3) atoms to form CsCl12 cuboctahedra that share corners with three equivalent Pb(1)Cl6 octahedra, corners with six equivalent Ta(1)Cl5 square pyramids, edges with three equivalent Cs(1)Cl12 cuboctahedra, edges with three equivalent Ta(1)Cl5 square pyramids, and faces with three equivalent Ta(1)Cl5 square pyramids. The corner-sharing octahedral tilt angles are 56°. Ta(1) is bonded to one Cl(2), two equivalent Cl(1), and two equivalent Cl(3) atoms to form distorted TaCl5 square pyramids that share corners with two equivalent Cs(1)Cl12 cuboctahedra,  a cornercorner with one Pb(1)Cl6 octahedra, corners with four equivalent Ta(1)Cl5 square pyramids,  an edgeedge with one Cs(1)Cl12 cuboctahedra, and  a faceface with one Cs(1)Cl12 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. Pb(1) is bonded to six equivalent Cl(2) atoms to form PbCl6 octahedra that share corners with six equivalent Cs(1)Cl12 cuboctahedra and corners with six equivalent Ta(1)Cl5 square pyramids. There are three inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Cs(1) and two equivalent Ta(1) atoms. In the second Cl site, Cl(2) is bonded in a 3-coordinate geometry to one Cs(1), one Ta(1), and one Pb(1) atom. In the third Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Cs(1) and two equivalent Ta(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Cs2Ta6PbCl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.515
_cell_length_b   10.515
_cell_length_c   10.515
_cell_angle_alpha   54.852
_cell_angle_beta   54.852
_cell_angle_gamma   54.852
_symmetry_Int_Tables_number   1
_cell_volume   723.518
_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
  Cs  Cs0  1  0.277  0.277  0.277  1.0
  Cs  Cs1  1  0.723  0.723  0.723  1.0
  Ta  Ta2  1  0.421  0.303  0.644  1.0
  Ta  Ta3  1  0.356  0.579  0.697  1.0
  Ta  Ta4  1  0.697  0.356  0.579  1.0
  Ta  Ta5  1  0.644  0.421  0.303  1.0
  Ta  Ta6  1  0.579  0.697  0.356  1.0
  Ta  Ta7  1  0.303  0.644  0.421  1.0
  Pb  Pb8  1  0.000  0.000  0.000  1.0
  Cl  Cl9  1  0.640  0.095  0.767  1.0
  Cl  Cl10  1  0.767  0.640  0.095  1.0
  Cl  Cl11  1  0.095  0.767  0.640  1.0
  Cl  Cl12  1  0.825  0.323  0.045  1.0
  Cl  Cl13  1  0.170  0.436  0.577  1.0
  Cl  Cl14  1  0.677  0.955  0.175  1.0
  Cl  Cl15  1  0.905  0.233  0.360  1.0
  Cl  Cl16  1  0.564  0.423  0.830  1.0
  Cl  Cl17  1  0.423  0.830  0.564  1.0
  Cl  Cl18  1  0.955  0.175  0.677  1.0
  Cl  Cl19  1  0.175  0.677  0.955  1.0
  Cl  Cl20  1  0.045  0.825  0.323  1.0
  Cl  Cl21  1  0.323  0.045  0.825  1.0
  Cl  Cl22  1  0.233  0.360  0.905  1.0
  Cl  Cl23  1  0.577  0.170  0.436  1.0
  Cl  Cl24  1  0.436  0.577  0.170  1.0
  Cl  Cl25  1  0.360  0.905  0.233  1.0
  Cl  Cl26  1  0.830  0.564  0.423  1.0
[/CIF]
.