The structure described by Rb4Zr6Cl18C crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 6-coordinate geometry to one Cl(1), one Cl(2), one Cl(5), and three equivalent Cl(4) atoms. There are two inequivalent Zr sites. In the first Zr site, Zr(1) is bonded to one C(1), one Cl(5), two equivalent Cl(1), and two equivalent Cl(6) atoms to form a mixture of corner and edge-sharing ZrCCl5 octahedra. The corner-sharing octahedra are not tilted. In the second Zr site, Zr(2) is bonded to one C(1), one Cl(1), one Cl(2), one Cl(3), one Cl(4), and one Cl(6) atom to form a mixture of corner and edge-sharing ZrCCl5 octahedra. The corner-sharing octahedra are not tilted. C(1) is bonded to two equivalent Zr(1) and four equivalent Zr(2) atoms to form CZr6 octahedra that share corners with four equivalent Cl(4)Rb3Zr tetrahedra. There are six inequivalent Cl sites. In the first Cl site, Cl(5) is bonded in a trigonal planar geometry to two equivalent Rb(1) and one Zr(1) atom. In the second Cl site, Cl(6) is bonded in an L-shaped geometry to one Zr(1) and one Zr(2) atom. In the third Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Rb(1), one Zr(1), and one Zr(2) atom. In the fourth Cl site, Cl(2) is bonded in a 2-coordinate geometry to two equivalent Rb(1) and two equivalent Zr(2) atoms. In the fifth Cl site, Cl(3) is bonded in an L-shaped geometry to two equivalent Zr(2) atoms. In the sixth Cl site, Cl(4) is bonded to three equivalent Rb(1) and one Zr(2) atom to form ClRb3Zr tetrahedra that share  a cornercorner with one C(1)Zr6 octahedra, corners with two equivalent Cl(4)Rb3Zr tetrahedra, and edges with two equivalent Cl(4)Rb3Zr tetrahedra. The corner-sharing octahedral tilt angles are 1°. is represented by the CIF card [CIF]
data_Rb4Zr6CCl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.333
_cell_length_b   10.333
_cell_length_c   10.017
_cell_angle_alpha   77.276
_cell_angle_beta   77.276
_cell_angle_gamma   117.513
_symmetry_Int_Tables_number   1
_cell_volume   858.766
_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
  Rb  Rb0  1  0.770  0.446  0.682  1.0
  Rb  Rb1  1  0.554  0.230  0.318  1.0
  Rb  Rb2  1  0.230  0.554  0.318  1.0
  Rb  Rb3  1  0.446  0.770  0.682  1.0
  Zr  Zr4  1  0.122  0.122  0.143  1.0
  Zr  Zr5  1  0.878  0.878  0.857  1.0
  Zr  Zr6  1  0.948  0.764  0.149  1.0
  Zr  Zr7  1  0.236  0.052  0.851  1.0
  Zr  Zr8  1  0.052  0.236  0.851  1.0
  Zr  Zr9  1  0.764  0.948  0.149  1.0
  C  C10  1  0.000  0.000  0.000  1.0
  Cl  Cl11  1  0.808  0.603  0.008  1.0
  Cl  Cl12  1  0.397  0.192  0.992  1.0
  Cl  Cl13  1  0.192  0.397  0.992  1.0
  Cl  Cl14  1  0.603  0.808  0.008  1.0
  Cl  Cl15  1  0.205  0.795  0.000  1.0
  Cl  Cl16  1  0.795  0.205  0.000  1.0
  Cl  Cl17  1  0.320  0.320  0.673  1.0
  Cl  Cl18  1  0.680  0.680  0.327  1.0
  Cl  Cl19  1  0.888  0.494  0.324  1.0
  Cl  Cl20  1  0.506  0.112  0.676  1.0
  Cl  Cl21  1  0.112  0.506  0.676  1.0
  Cl  Cl22  1  0.494  0.888  0.324  1.0
  Cl  Cl23  1  0.262  0.262  0.301  1.0
  Cl  Cl24  1  0.738  0.738  0.699  1.0
  Cl  Cl25  1  0.078  0.873  0.320  1.0
  Cl  Cl26  1  0.127  0.922  0.680  1.0
  Cl  Cl27  1  0.922  0.127  0.680  1.0
  Cl  Cl28  1  0.873  0.078  0.320  1.0
[/CIF]
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The structure described by Rb4Zr6Cl18C crystallizes in the monoclinic C2/m space group. Rb(1) is bonded in a 6-coordinate geometry to one Cl(1), one Cl(2), one Cl(5), and three equivalent Cl(4) atoms. There are two inequivalent Zr sites. In the first Zr site, Zr(1) is bonded to one C(1), one Cl(5), two equivalent Cl(1), and two equivalent Cl(6) atoms to form a mixture of corner and edge-sharing ZrCCl5 octahedra. The corner-sharing octahedra are not tilted. In the second Zr site, Zr(2) is bonded to one C(1), one Cl(1), one Cl(2), one Cl(3), one Cl(4), and one Cl(6) atom to form a mixture of corner and edge-sharing ZrCCl5 octahedra. The corner-sharing octahedra are not tilted. C(1) is bonded to two equivalent Zr(1) and four equivalent Zr(2) atoms to form CZr6 octahedra that share corners with four equivalent Cl(4)Rb3Zr tetrahedra. There are six inequivalent Cl sites. In the first Cl site, Cl(5) is bonded in a trigonal planar geometry to two equivalent Rb(1) and one Zr(1) atom. In the second Cl site, Cl(6) is bonded in an L-shaped geometry to one Zr(1) and one Zr(2) atom. In the third Cl site, Cl(1) is bonded in a 2-coordinate geometry to one Rb(1), one Zr(1), and one Zr(2) atom. In the fourth Cl site, Cl(2) is bonded in a 2-coordinate geometry to two equivalent Rb(1) and two equivalent Zr(2) atoms. In the fifth Cl site, Cl(3) is bonded in an L-shaped geometry to two equivalent Zr(2) atoms. In the sixth Cl site, Cl(4) is bonded to three equivalent Rb(1) and one Zr(2) atom to form ClRb3Zr tetrahedra that share  a cornercorner with one C(1)Zr6 octahedra, corners with two equivalent Cl(4)Rb3Zr tetrahedra, and edges with two equivalent Cl(4)Rb3Zr tetrahedra. The corner-sharing octahedral tilt angles are 1°. is represented by the CIF card [CIF]
data_Rb4Zr6CCl18
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.333
_cell_length_b   10.333
_cell_length_c   10.017
_cell_angle_alpha   77.276
_cell_angle_beta   77.276
_cell_angle_gamma   117.513
_symmetry_Int_Tables_number   1
_cell_volume   858.766
_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
  Rb  Rb0  1  0.770  0.446  0.682  1.0
  Rb  Rb1  1  0.554  0.230  0.318  1.0
  Rb  Rb2  1  0.230  0.554  0.318  1.0
  Rb  Rb3  1  0.446  0.770  0.682  1.0
  Zr  Zr4  1  0.122  0.122  0.143  1.0
  Zr  Zr5  1  0.878  0.878  0.857  1.0
  Zr  Zr6  1  0.948  0.764  0.149  1.0
  Zr  Zr7  1  0.236  0.052  0.851  1.0
  Zr  Zr8  1  0.052  0.236  0.851  1.0
  Zr  Zr9  1  0.764  0.948  0.149  1.0
  C  C10  1  0.000  0.000  0.000  1.0
  Cl  Cl11  1  0.808  0.603  0.008  1.0
  Cl  Cl12  1  0.397  0.192  0.992  1.0
  Cl  Cl13  1  0.192  0.397  0.992  1.0
  Cl  Cl14  1  0.603  0.808  0.008  1.0
  Cl  Cl15  1  0.205  0.795  0.000  1.0
  Cl  Cl16  1  0.795  0.205  0.000  1.0
  Cl  Cl17  1  0.320  0.320  0.673  1.0
  Cl  Cl18  1  0.680  0.680  0.327  1.0
  Cl  Cl19  1  0.888  0.494  0.324  1.0
  Cl  Cl20  1  0.506  0.112  0.676  1.0
  Cl  Cl21  1  0.112  0.506  0.676  1.0
  Cl  Cl22  1  0.494  0.888  0.324  1.0
  Cl  Cl23  1  0.262  0.262  0.301  1.0
  Cl  Cl24  1  0.738  0.738  0.699  1.0
  Cl  Cl25  1  0.078  0.873  0.320  1.0
  Cl  Cl26  1  0.127  0.922  0.680  1.0
  Cl  Cl27  1  0.922  0.127  0.680  1.0
  Cl  Cl28  1  0.873  0.078  0.320  1.0
[/CIF]
.