The material described by Rb2CeI5 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent I(1), two equivalent I(2), two equivalent I(3), and two equivalent I(4) atoms. Ce(1) is bonded to one I(1), one I(3), one I(4), and four equivalent I(2) atoms to form distorted edge-sharing CeI7 pentagonal bipyramids. There are four inequivalent I sites. In the first I site, I(1) is bonded to four equivalent Rb(1) and one Ce(1) atom to form distorted IRb4Ce trigonal bipyramids that share  a cornercorner with one I(4)Rb4Ce trigonal bipyramid, corners with four equivalent I(1)Rb4Ce trigonal bipyramids, corners with five equivalent I(3)Rb4Ce trigonal bipyramids, corners with four equivalent I(2)Rb2Ce2 trigonal pyramids, edges with two equivalent I(3)Rb4Ce trigonal bipyramids, edges with four equivalent I(4)Rb4Ce trigonal bipyramids, and edges with four equivalent I(2)Rb2Ce2 trigonal pyramids. In the second I site, I(2) is bonded to two equivalent Rb(1) and two equivalent Ce(1) atoms to form distorted IRb2Ce2 trigonal pyramids that share corners with two equivalent I(1)Rb4Ce trigonal bipyramids, corners with two equivalent I(4)Rb4Ce trigonal bipyramids, corners with four equivalent I(3)Rb4Ce trigonal bipyramids, corners with six equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(3)Rb4Ce trigonal bipyramid, edges with two equivalent I(1)Rb4Ce trigonal bipyramids, edges with two equivalent I(4)Rb4Ce trigonal bipyramids, and  an edgeedge with one I(2)Rb2Ce2 trigonal pyramid. In the third I site, I(3) is bonded to four equivalent Rb(1) and one Ce(1) atom to form IRb4Ce trigonal bipyramids that share corners with four equivalent I(4)Rb4Ce trigonal bipyramids, corners with five equivalent I(1)Rb4Ce trigonal bipyramids, corners with eight equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(4)Rb4Ce trigonal bipyramid, edges with two equivalent I(1)Rb4Ce trigonal bipyramids, edges with two equivalent I(3)Rb4Ce trigonal bipyramids, edges with two equivalent I(2)Rb2Ce2 trigonal pyramids, and  a faceface with one I(4)Rb4Ce trigonal bipyramid. In the fourth I site, I(4) is bonded to four equivalent Rb(1) and one Ce(1) atom to form distorted IRb4Ce trigonal bipyramids that share  a cornercorner with one I(1)Rb4Ce trigonal bipyramid, corners with four equivalent I(3)Rb4Ce trigonal bipyramids, corners with four equivalent I(4)Rb4Ce trigonal bipyramids, corners with four equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(3)Rb4Ce trigonal bipyramid, edges with four equivalent I(1)Rb4Ce trigonal bipyramids, edges with four equivalent I(2)Rb2Ce2 trigonal pyramids, and  a faceface with one I(3)Rb4Ce trigonal bipyramid. is represented by the CIF file [CIF]
data_Rb2CeI5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.343
_cell_length_b   10.111
_cell_length_c   14.783
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1396.422
_cell_formula_units_Z   4
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  0.938  0.005  0.828  1.0
  Rb  Rb1  1  0.062  0.995  0.172  1.0
  Rb  Rb2  1  0.438  0.995  0.672  1.0
  Rb  Rb3  1  0.062  0.505  0.172  1.0
  Rb  Rb4  1  0.562  0.005  0.328  1.0
  Rb  Rb5  1  0.938  0.495  0.828  1.0
  Rb  Rb6  1  0.562  0.495  0.328  1.0
  Rb  Rb7  1  0.438  0.505  0.672  1.0
  Ce  Ce8  1  0.921  0.750  0.506  1.0
  Ce  Ce9  1  0.079  0.250  0.494  1.0
  Ce  Ce10  1  0.421  0.250  0.994  1.0
  Ce  Ce11  1  0.579  0.750  0.006  1.0
  I  I12  1  0.121  0.750  0.681  1.0
  I  I13  1  0.879  0.250  0.319  1.0
  I  I14  1  0.621  0.250  0.819  1.0
  I  I15  1  0.379  0.750  0.181  1.0
  I  I16  1  0.832  0.045  0.574  1.0
  I  I17  1  0.168  0.955  0.426  1.0
  I  I18  1  0.332  0.955  0.926  1.0
  I  I19  1  0.168  0.545  0.426  1.0
  I  I20  1  0.668  0.045  0.074  1.0
  I  I21  1  0.832  0.455  0.574  1.0
  I  I22  1  0.668  0.455  0.074  1.0
  I  I23  1  0.332  0.545  0.926  1.0
  I  I24  1  0.573  0.750  0.509  1.0
  I  I25  1  0.427  0.250  0.491  1.0
  I  I26  1  0.073  0.250  0.991  1.0
  I  I27  1  0.927  0.750  0.009  1.0
  I  I28  1  0.658  0.750  0.796  1.0
  I  I29  1  0.342  0.250  0.204  1.0
  I  I30  1  0.158  0.250  0.704  1.0
  I  I31  1  0.842  0.750  0.296  1.0
[/CIF]
.
The material described by Rb2CeI5 crystallizes in the orthorhombic Pnma space group. Rb(1) is bonded in a 8-coordinate geometry to two equivalent I(1), two equivalent I(2), two equivalent I(3), and two equivalent I(4) atoms. Ce(1) is bonded to one I(1), one I(3), one I(4), and four equivalent I(2) atoms to form distorted edge-sharing CeI7 pentagonal bipyramids. There are four inequivalent I sites. In the first I site, I(1) is bonded to four equivalent Rb(1) and one Ce(1) atom to form distorted IRb4Ce trigonal bipyramids that share  a cornercorner with one I(4)Rb4Ce trigonal bipyramid, corners with four equivalent I(1)Rb4Ce trigonal bipyramids, corners with five equivalent I(3)Rb4Ce trigonal bipyramids, corners with four equivalent I(2)Rb2Ce2 trigonal pyramids, edges with two equivalent I(3)Rb4Ce trigonal bipyramids, edges with four equivalent I(4)Rb4Ce trigonal bipyramids, and edges with four equivalent I(2)Rb2Ce2 trigonal pyramids. In the second I site, I(2) is bonded to two equivalent Rb(1) and two equivalent Ce(1) atoms to form distorted IRb2Ce2 trigonal pyramids that share corners with two equivalent I(1)Rb4Ce trigonal bipyramids, corners with two equivalent I(4)Rb4Ce trigonal bipyramids, corners with four equivalent I(3)Rb4Ce trigonal bipyramids, corners with six equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(3)Rb4Ce trigonal bipyramid, edges with two equivalent I(1)Rb4Ce trigonal bipyramids, edges with two equivalent I(4)Rb4Ce trigonal bipyramids, and  an edgeedge with one I(2)Rb2Ce2 trigonal pyramid. In the third I site, I(3) is bonded to four equivalent Rb(1) and one Ce(1) atom to form IRb4Ce trigonal bipyramids that share corners with four equivalent I(4)Rb4Ce trigonal bipyramids, corners with five equivalent I(1)Rb4Ce trigonal bipyramids, corners with eight equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(4)Rb4Ce trigonal bipyramid, edges with two equivalent I(1)Rb4Ce trigonal bipyramids, edges with two equivalent I(3)Rb4Ce trigonal bipyramids, edges with two equivalent I(2)Rb2Ce2 trigonal pyramids, and  a faceface with one I(4)Rb4Ce trigonal bipyramid. In the fourth I site, I(4) is bonded to four equivalent Rb(1) and one Ce(1) atom to form distorted IRb4Ce trigonal bipyramids that share  a cornercorner with one I(1)Rb4Ce trigonal bipyramid, corners with four equivalent I(3)Rb4Ce trigonal bipyramids, corners with four equivalent I(4)Rb4Ce trigonal bipyramids, corners with four equivalent I(2)Rb2Ce2 trigonal pyramids,  an edgeedge with one I(3)Rb4Ce trigonal bipyramid, edges with four equivalent I(1)Rb4Ce trigonal bipyramids, edges with four equivalent I(2)Rb2Ce2 trigonal pyramids, and  a faceface with one I(3)Rb4Ce trigonal bipyramid. is represented by the CIF file [CIF]
data_Rb2CeI5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.343
_cell_length_b   10.111
_cell_length_c   14.783
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1396.422
_cell_formula_units_Z   4
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  0.938  0.005  0.828  1.0
  Rb  Rb1  1  0.062  0.995  0.172  1.0
  Rb  Rb2  1  0.438  0.995  0.672  1.0
  Rb  Rb3  1  0.062  0.505  0.172  1.0
  Rb  Rb4  1  0.562  0.005  0.328  1.0
  Rb  Rb5  1  0.938  0.495  0.828  1.0
  Rb  Rb6  1  0.562  0.495  0.328  1.0
  Rb  Rb7  1  0.438  0.505  0.672  1.0
  Ce  Ce8  1  0.921  0.750  0.506  1.0
  Ce  Ce9  1  0.079  0.250  0.494  1.0
  Ce  Ce10  1  0.421  0.250  0.994  1.0
  Ce  Ce11  1  0.579  0.750  0.006  1.0
  I  I12  1  0.121  0.750  0.681  1.0
  I  I13  1  0.879  0.250  0.319  1.0
  I  I14  1  0.621  0.250  0.819  1.0
  I  I15  1  0.379  0.750  0.181  1.0
  I  I16  1  0.832  0.045  0.574  1.0
  I  I17  1  0.168  0.955  0.426  1.0
  I  I18  1  0.332  0.955  0.926  1.0
  I  I19  1  0.168  0.545  0.426  1.0
  I  I20  1  0.668  0.045  0.074  1.0
  I  I21  1  0.832  0.455  0.574  1.0
  I  I22  1  0.668  0.455  0.074  1.0
  I  I23  1  0.332  0.545  0.926  1.0
  I  I24  1  0.573  0.750  0.509  1.0
  I  I25  1  0.427  0.250  0.491  1.0
  I  I26  1  0.073  0.250  0.991  1.0
  I  I27  1  0.927  0.750  0.009  1.0
  I  I28  1  0.658  0.750  0.796  1.0
  I  I29  1  0.342  0.250  0.204  1.0
  I  I30  1  0.158  0.250  0.704  1.0
  I  I31  1  0.842  0.750  0.296  1.0
[/CIF]
.