The crystal structure described by K2CeI5 crystallizes in the orthorhombic Pnma space group. K(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 K(1) and one Ce(1) atom to form distorted IK4Ce trigonal bipyramids that share  a cornercorner with one I(4)K4Ce trigonal bipyramid, corners with four equivalent I(1)K4Ce trigonal bipyramids, corners with five equivalent I(3)K4Ce trigonal bipyramids, corners with four equivalent I(2)K2Ce2 trigonal pyramids, edges with two equivalent I(3)K4Ce trigonal bipyramids, edges with four equivalent I(4)K4Ce trigonal bipyramids, and edges with four equivalent I(2)K2Ce2 trigonal pyramids. In the second I site, I(2) is bonded to two equivalent K(1) and two equivalent Ce(1) atoms to form distorted IK2Ce2 trigonal pyramids that share corners with two equivalent I(1)K4Ce trigonal bipyramids, corners with two equivalent I(4)K4Ce trigonal bipyramids, corners with four equivalent I(3)K4Ce trigonal bipyramids, corners with six equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(3)K4Ce trigonal bipyramid, edges with two equivalent I(1)K4Ce trigonal bipyramids, edges with two equivalent I(4)K4Ce trigonal bipyramids, and  an edgeedge with one I(2)K2Ce2 trigonal pyramid. In the third I site, I(3) is bonded to four equivalent K(1) and one Ce(1) atom to form IK4Ce trigonal bipyramids that share corners with four equivalent I(4)K4Ce trigonal bipyramids, corners with five equivalent I(1)K4Ce trigonal bipyramids, corners with eight equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(4)K4Ce trigonal bipyramid, edges with two equivalent I(1)K4Ce trigonal bipyramids, edges with two equivalent I(3)K4Ce trigonal bipyramids, edges with two equivalent I(2)K2Ce2 trigonal pyramids, and  a faceface with one I(4)K4Ce trigonal bipyramid. In the fourth I site, I(4) is bonded to four equivalent K(1) and one Ce(1) atom to form IK4Ce trigonal bipyramids that share  a cornercorner with one I(1)K4Ce trigonal bipyramid, corners with four equivalent I(3)K4Ce trigonal bipyramids, corners with four equivalent I(4)K4Ce trigonal bipyramids, corners with four equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(3)K4Ce trigonal bipyramid, edges with four equivalent I(1)K4Ce trigonal bipyramids, edges with four equivalent I(2)K2Ce2 trigonal pyramids, and  a faceface with one I(3)K4Ce trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CeI5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.205
_cell_length_b   9.929
_cell_length_c   14.458
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1321.378
_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
  K  K0  1  0.946  0.003  0.827  1.0
  K  K1  1  0.054  0.997  0.173  1.0
  K  K2  1  0.446  0.997  0.673  1.0
  K  K3  1  0.054  0.503  0.173  1.0
  K  K4  1  0.554  0.003  0.327  1.0
  K  K5  1  0.946  0.497  0.827  1.0
  K  K6  1  0.554  0.497  0.327  1.0
  K  K7  1  0.446  0.503  0.673  1.0
  Ce  Ce8  1  0.919  0.750  0.506  1.0
  Ce  Ce9  1  0.081  0.250  0.494  1.0
  Ce  Ce10  1  0.419  0.250  0.994  1.0
  Ce  Ce11  1  0.581  0.750  0.006  1.0
  I  I12  1  0.130  0.750  0.683  1.0
  I  I13  1  0.870  0.250  0.317  1.0
  I  I14  1  0.630  0.250  0.817  1.0
  I  I15  1  0.370  0.750  0.183  1.0
  I  I16  1  0.831  0.046  0.578  1.0
  I  I17  1  0.169  0.954  0.422  1.0
  I  I18  1  0.331  0.954  0.922  1.0
  I  I19  1  0.169  0.546  0.422  1.0
  I  I20  1  0.669  0.046  0.078  1.0
  I  I21  1  0.831  0.454  0.578  1.0
  I  I22  1  0.669  0.454  0.078  1.0
  I  I23  1  0.331  0.546  0.922  1.0
  I  I24  1  0.564  0.750  0.507  1.0
  I  I25  1  0.436  0.250  0.493  1.0
  I  I26  1  0.064  0.250  0.993  1.0
  I  I27  1  0.936  0.750  0.007  1.0
  I  I28  1  0.666  0.750  0.791  1.0
  I  I29  1  0.334  0.250  0.209  1.0
  I  I30  1  0.166  0.250  0.709  1.0
  I  I31  1  0.834  0.750  0.291  1.0
[/CIF]
.
The crystal structure described by K2CeI5 crystallizes in the orthorhombic Pnma space group. K(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 K(1) and one Ce(1) atom to form distorted IK4Ce trigonal bipyramids that share  a cornercorner with one I(4)K4Ce trigonal bipyramid, corners with four equivalent I(1)K4Ce trigonal bipyramids, corners with five equivalent I(3)K4Ce trigonal bipyramids, corners with four equivalent I(2)K2Ce2 trigonal pyramids, edges with two equivalent I(3)K4Ce trigonal bipyramids, edges with four equivalent I(4)K4Ce trigonal bipyramids, and edges with four equivalent I(2)K2Ce2 trigonal pyramids. In the second I site, I(2) is bonded to two equivalent K(1) and two equivalent Ce(1) atoms to form distorted IK2Ce2 trigonal pyramids that share corners with two equivalent I(1)K4Ce trigonal bipyramids, corners with two equivalent I(4)K4Ce trigonal bipyramids, corners with four equivalent I(3)K4Ce trigonal bipyramids, corners with six equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(3)K4Ce trigonal bipyramid, edges with two equivalent I(1)K4Ce trigonal bipyramids, edges with two equivalent I(4)K4Ce trigonal bipyramids, and  an edgeedge with one I(2)K2Ce2 trigonal pyramid. In the third I site, I(3) is bonded to four equivalent K(1) and one Ce(1) atom to form IK4Ce trigonal bipyramids that share corners with four equivalent I(4)K4Ce trigonal bipyramids, corners with five equivalent I(1)K4Ce trigonal bipyramids, corners with eight equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(4)K4Ce trigonal bipyramid, edges with two equivalent I(1)K4Ce trigonal bipyramids, edges with two equivalent I(3)K4Ce trigonal bipyramids, edges with two equivalent I(2)K2Ce2 trigonal pyramids, and  a faceface with one I(4)K4Ce trigonal bipyramid. In the fourth I site, I(4) is bonded to four equivalent K(1) and one Ce(1) atom to form IK4Ce trigonal bipyramids that share  a cornercorner with one I(1)K4Ce trigonal bipyramid, corners with four equivalent I(3)K4Ce trigonal bipyramids, corners with four equivalent I(4)K4Ce trigonal bipyramids, corners with four equivalent I(2)K2Ce2 trigonal pyramids,  an edgeedge with one I(3)K4Ce trigonal bipyramid, edges with four equivalent I(1)K4Ce trigonal bipyramids, edges with four equivalent I(2)K2Ce2 trigonal pyramids, and  a faceface with one I(3)K4Ce trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2CeI5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.205
_cell_length_b   9.929
_cell_length_c   14.458
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1321.378
_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
  K  K0  1  0.946  0.003  0.827  1.0
  K  K1  1  0.054  0.997  0.173  1.0
  K  K2  1  0.446  0.997  0.673  1.0
  K  K3  1  0.054  0.503  0.173  1.0
  K  K4  1  0.554  0.003  0.327  1.0
  K  K5  1  0.946  0.497  0.827  1.0
  K  K6  1  0.554  0.497  0.327  1.0
  K  K7  1  0.446  0.503  0.673  1.0
  Ce  Ce8  1  0.919  0.750  0.506  1.0
  Ce  Ce9  1  0.081  0.250  0.494  1.0
  Ce  Ce10  1  0.419  0.250  0.994  1.0
  Ce  Ce11  1  0.581  0.750  0.006  1.0
  I  I12  1  0.130  0.750  0.683  1.0
  I  I13  1  0.870  0.250  0.317  1.0
  I  I14  1  0.630  0.250  0.817  1.0
  I  I15  1  0.370  0.750  0.183  1.0
  I  I16  1  0.831  0.046  0.578  1.0
  I  I17  1  0.169  0.954  0.422  1.0
  I  I18  1  0.331  0.954  0.922  1.0
  I  I19  1  0.169  0.546  0.422  1.0
  I  I20  1  0.669  0.046  0.078  1.0
  I  I21  1  0.831  0.454  0.578  1.0
  I  I22  1  0.669  0.454  0.078  1.0
  I  I23  1  0.331  0.546  0.922  1.0
  I  I24  1  0.564  0.750  0.507  1.0
  I  I25  1  0.436  0.250  0.493  1.0
  I  I26  1  0.064  0.250  0.993  1.0
  I  I27  1  0.936  0.750  0.007  1.0
  I  I28  1  0.666  0.750  0.791  1.0
  I  I29  1  0.334  0.250  0.209  1.0
  I  I30  1  0.166  0.250  0.709  1.0
  I  I31  1  0.834  0.750  0.291  1.0
[/CIF]
.