The structure described by CsEr10(C2I9)2 crystallizes in the triclinic P-1 space group. Cs(1) is bonded to two equivalent I(2), two equivalent I(4), two equivalent I(5), two equivalent I(6), two equivalent I(7), and two equivalent I(8) atoms to form distorted CsI12 cuboctahedra that share corners with two equivalent Er(1)CI5 octahedra, corners with four equivalent Er(4)CI5 octahedra, and faces with two equivalent Er(1)CI5 octahedra. The corner-sharing octahedral tilt angles range from 41-46°. There are five inequivalent Er sites. In the first Er site, Er(1) is bonded to one C(1), one I(1), one I(2), one I(6), and two equivalent I(4) atoms to form distorted ErCI5 octahedra that share  a cornercorner with one Cs(1)I12 cuboctahedra,  an edgeedge with one Er(1)CI5 octahedra,  an edgeedge with one Er(4)CI5 octahedra, and  a faceface with one Cs(1)I12 cuboctahedra. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(3), one I(5), one I(7), and two equivalent I(2) atoms. In the third Er site, Er(3) is bonded in a 8-coordinate geometry to two equivalent C(1), two equivalent C(2), one I(1), one I(3), one I(6), and one I(8) atom. In the fourth Er site, Er(4) is bonded to one C(2), one I(1), one I(5), one I(6), and two equivalent I(9) atoms to form distorted ErCI5 octahedra that share corners with two equivalent Cs(1)I12 cuboctahedra,  an edgeedge with one Er(1)CI5 octahedra, and  an edgeedge with one Er(4)CI5 octahedra. In the fifth Er site, Er(5) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(4), one I(8), one I(9), and two equivalent I(7) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(5), two equivalent Er(3), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Er(2), one Er(4), one Er(5), two equivalent Er(3), and one C(1) atom. There are nine inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to one Er(1), one Er(3), and one Er(4) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Cs(1), one Er(1), and two equivalent Er(2) atoms. In the third I site, I(3) is bonded in a 2-coordinate geometry to one Er(2) and one Er(3) atom. In the fourth I site, I(4) is bonded in a distorted rectangular see-saw-like geometry to one Cs(1), one Er(5), and two equivalent Er(1) atoms. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one Cs(1), one Er(2), and one Er(4) atom. In the sixth I site, I(6) is bonded in a 4-coordinate geometry to one Cs(1), one Er(1), one Er(3), and one Er(4) atom. In the seventh I site, I(7) is bonded in a 4-coordinate geometry to one Cs(1), one Er(2), and two equivalent Er(5) atoms. In the eighth I site, I(8) is bonded in a 2-coordinate geometry to one Cs(1), one Er(3), and one Er(5) atom. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Er(5) and two equivalent Er(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsEr10(C2I9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.442
_cell_length_b   11.442
_cell_length_c   11.465
_cell_angle_alpha   93.244
_cell_angle_beta   109.849
_cell_angle_gamma   119.911
_symmetry_Int_Tables_number   1
_cell_volume   1175.784
_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  0.000  0.500  0.500  1.0
  Er  Er1  1  0.962  0.927  0.678  1.0
  Er  Er2  1  0.038  0.073  0.322  1.0
  Er  Er3  1  0.385  0.293  0.288  1.0
  Er  Er4  1  0.615  0.707  0.712  1.0
  Er  Er5  1  0.945  0.842  0.001  1.0
  Er  Er6  1  0.055  0.158  0.999  1.0
  Er  Er7  1  0.350  0.075  0.015  1.0
  Er  Er8  1  0.650  0.925  0.985  1.0
  Er  Er9  1  0.272  0.955  0.285  1.0
  Er  Er10  1  0.728  0.045  0.715  1.0
  C  C11  1  0.141  0.067  0.195  1.0
  C  C12  1  0.859  0.933  0.805  1.0
  C  C13  1  0.218  0.067  0.118  1.0
  C  C14  1  0.782  0.933  0.882  1.0
  I  I15  1  0.243  0.217  0.831  1.0
  I  I16  1  0.757  0.783  0.169  1.0
  I  I17  1  0.703  0.637  0.502  1.0
  I  I18  1  0.297  0.363  0.498  1.0
  I  I19  1  0.692  0.530  0.848  1.0
  I  I20  1  0.308  0.470  0.152  1.0
  I  I21  1  0.143  0.923  0.497  1.0
  I  I22  1  0.857  0.077  0.503  1.0
  I  I23  1  0.617  0.360  0.181  1.0
  I  I24  1  0.383  0.640  0.819  1.0
  I  I25  1  0.097  0.781  0.830  1.0
  I  I26  1  0.903  0.219  0.170  1.0
  I  I27  1  0.559  0.206  0.494  1.0
  I  I28  1  0.441  0.794  0.506  1.0
  I  I29  1  0.041  0.659  0.158  1.0
  I  I30  1  0.959  0.341  0.842  1.0
  I  I31  1  0.532  0.079  0.834  1.0
  I  I32  1  0.468  0.921  0.166  1.0
[/CIF]
.
The structure described by CsEr10(C2I9)2 crystallizes in the triclinic P-1 space group. Cs(1) is bonded to two equivalent I(2), two equivalent I(4), two equivalent I(5), two equivalent I(6), two equivalent I(7), and two equivalent I(8) atoms to form distorted CsI12 cuboctahedra that share corners with two equivalent Er(1)CI5 octahedra, corners with four equivalent Er(4)CI5 octahedra, and faces with two equivalent Er(1)CI5 octahedra. The corner-sharing octahedral tilt angles range from 41-46°. There are five inequivalent Er sites. In the first Er site, Er(1) is bonded to one C(1), one I(1), one I(2), one I(6), and two equivalent I(4) atoms to form distorted ErCI5 octahedra that share  a cornercorner with one Cs(1)I12 cuboctahedra,  an edgeedge with one Er(1)CI5 octahedra,  an edgeedge with one Er(4)CI5 octahedra, and  a faceface with one Cs(1)I12 cuboctahedra. In the second Er site, Er(2) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(3), one I(5), one I(7), and two equivalent I(2) atoms. In the third Er site, Er(3) is bonded in a 8-coordinate geometry to two equivalent C(1), two equivalent C(2), one I(1), one I(3), one I(6), and one I(8) atom. In the fourth Er site, Er(4) is bonded to one C(2), one I(1), one I(5), one I(6), and two equivalent I(9) atoms to form distorted ErCI5 octahedra that share corners with two equivalent Cs(1)I12 cuboctahedra,  an edgeedge with one Er(1)CI5 octahedra, and  an edgeedge with one Er(4)CI5 octahedra. In the fifth Er site, Er(5) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(4), one I(8), one I(9), and two equivalent I(7) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(5), two equivalent Er(3), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Er(2), one Er(4), one Er(5), two equivalent Er(3), and one C(1) atom. There are nine inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to one Er(1), one Er(3), and one Er(4) atom. In the second I site, I(2) is bonded in a distorted rectangular see-saw-like geometry to one Cs(1), one Er(1), and two equivalent Er(2) atoms. In the third I site, I(3) is bonded in a 2-coordinate geometry to one Er(2) and one Er(3) atom. In the fourth I site, I(4) is bonded in a distorted rectangular see-saw-like geometry to one Cs(1), one Er(5), and two equivalent Er(1) atoms. In the fifth I site, I(5) is bonded in a 3-coordinate geometry to one Cs(1), one Er(2), and one Er(4) atom. In the sixth I site, I(6) is bonded in a 4-coordinate geometry to one Cs(1), one Er(1), one Er(3), and one Er(4) atom. In the seventh I site, I(7) is bonded in a 4-coordinate geometry to one Cs(1), one Er(2), and two equivalent Er(5) atoms. In the eighth I site, I(8) is bonded in a 2-coordinate geometry to one Cs(1), one Er(3), and one Er(5) atom. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Er(5) and two equivalent Er(4) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_CsEr10(C2I9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.442
_cell_length_b   11.442
_cell_length_c   11.465
_cell_angle_alpha   93.244
_cell_angle_beta   109.849
_cell_angle_gamma   119.911
_symmetry_Int_Tables_number   1
_cell_volume   1175.784
_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  0.000  0.500  0.500  1.0
  Er  Er1  1  0.962  0.927  0.678  1.0
  Er  Er2  1  0.038  0.073  0.322  1.0
  Er  Er3  1  0.385  0.293  0.288  1.0
  Er  Er4  1  0.615  0.707  0.712  1.0
  Er  Er5  1  0.945  0.842  0.001  1.0
  Er  Er6  1  0.055  0.158  0.999  1.0
  Er  Er7  1  0.350  0.075  0.015  1.0
  Er  Er8  1  0.650  0.925  0.985  1.0
  Er  Er9  1  0.272  0.955  0.285  1.0
  Er  Er10  1  0.728  0.045  0.715  1.0
  C  C11  1  0.141  0.067  0.195  1.0
  C  C12  1  0.859  0.933  0.805  1.0
  C  C13  1  0.218  0.067  0.118  1.0
  C  C14  1  0.782  0.933  0.882  1.0
  I  I15  1  0.243  0.217  0.831  1.0
  I  I16  1  0.757  0.783  0.169  1.0
  I  I17  1  0.703  0.637  0.502  1.0
  I  I18  1  0.297  0.363  0.498  1.0
  I  I19  1  0.692  0.530  0.848  1.0
  I  I20  1  0.308  0.470  0.152  1.0
  I  I21  1  0.143  0.923  0.497  1.0
  I  I22  1  0.857  0.077  0.503  1.0
  I  I23  1  0.617  0.360  0.181  1.0
  I  I24  1  0.383  0.640  0.819  1.0
  I  I25  1  0.097  0.781  0.830  1.0
  I  I26  1  0.903  0.219  0.170  1.0
  I  I27  1  0.559  0.206  0.494  1.0
  I  I28  1  0.441  0.794  0.506  1.0
  I  I29  1  0.041  0.659  0.158  1.0
  I  I30  1  0.959  0.341  0.842  1.0
  I  I31  1  0.532  0.079  0.834  1.0
  I  I32  1  0.468  0.921  0.166  1.0
[/CIF]
.