The material structure described by KSr2I5 crystallizes in the monoclinic P2_1/c 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. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent I(2), two equivalent I(3), two equivalent I(4), and two equivalent I(5) atoms. In the second Sr site, Sr(2) is bonded to one I(2), one I(3), one I(4), two equivalent I(1), and two equivalent I(5) atoms to form distorted edge-sharing SrI7 pentagonal bipyramids. There are five inequivalent I sites. In the first I site, I(1) is bonded to two equivalent K(1) and two equivalent Sr(2) atoms to form distorted IK2Sr2 trigonal pyramids that share corners with two equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with four equivalent I(5)Sr4 tetrahedra, corners with two equivalent I(2)K2Sr3 trigonal bipyramids, corners with two equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(3)K2Sr3 square pyramids, edges with two equivalent I(2)K2Sr3 trigonal bipyramids, and  an edgeedge with one I(1)K2Sr2 trigonal pyramid. In the second I site, I(2) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form distorted IK2Sr3 trigonal bipyramids that share  a cornercorner with one I(3)K2Sr3 square pyramid, corners with five equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra, corners with four equivalent I(2)K2Sr3 trigonal bipyramids, corners with two equivalent I(1)K2Sr2 trigonal pyramids, edges with two equivalent I(4)K2Sr3 square pyramids, edges with four equivalent I(3)K2Sr3 square pyramids, edges with two equivalent I(5)Sr4 tetrahedra, and edges with two equivalent I(1)K2Sr2 trigonal pyramids. In the third I site, I(3) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form IK2Sr3 square pyramids that share corners with four equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra,  a cornercorner with one I(2)K2Sr3 trigonal bipyramid, corners with two equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(5)Sr4 tetrahedra, edges with four equivalent I(2)K2Sr3 trigonal bipyramids, edges with two equivalent I(1)K2Sr2 trigonal pyramids, and  a faceface with one I(4)K2Sr3 square pyramid. In the fourth I site, I(4) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form IK2Sr3 square pyramids that share corners with four equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(5)Sr4 tetrahedra, corners with five equivalent I(2)K2Sr3 trigonal bipyramids, corners with four equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(3)K2Sr3 square pyramid, edges with two equivalent I(4)K2Sr3 square pyramids,  an edgeedge with one I(5)Sr4 tetrahedra, edges with two equivalent I(2)K2Sr3 trigonal bipyramids,  an edgeedge with one I(1)K2Sr2 trigonal pyramid, and  a faceface with one I(3)K2Sr3 square pyramid. In the fifth I site, I(5) is bonded to two equivalent Sr(1) and two equivalent Sr(2) atoms to form distorted ISr4 tetrahedra that share corners with two equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra, corners with two equivalent I(2)K2Sr3 trigonal bipyramids, corners with four equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(3)K2Sr3 square pyramids,  an edgeedge with one I(5)Sr4 tetrahedra, and edges with two equivalent I(2)K2Sr3 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_KSr2I5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.078
_cell_length_b   9.986
_cell_length_c   14.511
_cell_angle_alpha   90.015
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1315.420
_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  0.035  0.504  0.326  1.0
  K  K1  1  0.965  0.496  0.674  1.0
  K  K2  1  0.535  0.496  0.174  1.0
  K  K3  1  0.465  0.504  0.826  1.0
  Sr  Sr4  1  0.021  0.003  0.320  1.0
  Sr  Sr5  1  0.979  0.997  0.680  1.0
  Sr  Sr6  1  0.521  0.997  0.180  1.0
  Sr  Sr7  1  0.479  0.003  0.820  1.0
  Sr  Sr8  1  0.074  0.251  0.005  1.0
  Sr  Sr9  1  0.926  0.749  0.995  1.0
  Sr  Sr10  1  0.574  0.749  0.495  1.0
  Sr  Sr11  1  0.426  0.251  0.505  1.0
  I  I12  1  0.169  0.540  0.092  1.0
  I  I13  1  0.831  0.460  0.908  1.0
  I  I14  1  0.669  0.460  0.408  1.0
  I  I15  1  0.331  0.540  0.592  1.0
  I  I16  1  0.831  0.224  0.181  1.0
  I  I17  1  0.169  0.776  0.819  1.0
  I  I18  1  0.331  0.776  0.319  1.0
  I  I19  1  0.669  0.224  0.681  1.0
  I  I20  1  0.305  0.233  0.284  1.0
  I  I21  1  0.695  0.767  0.716  1.0
  I  I22  1  0.805  0.767  0.216  1.0
  I  I23  1  0.195  0.233  0.784  1.0
  I  I24  1  0.458  0.221  0.003  1.0
  I  I25  1  0.542  0.779  0.997  1.0
  I  I26  1  0.958  0.779  0.497  1.0
  I  I27  1  0.042  0.221  0.503  1.0
  I  I28  1  0.659  0.042  0.400  1.0
  I  I29  1  0.341  0.958  0.600  1.0
  I  I30  1  0.159  0.958  0.100  1.0
  I  I31  1  0.841  0.042  0.900  1.0
[/CIF]
.
The material structure described by KSr2I5 crystallizes in the monoclinic P2_1/c 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. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to two equivalent I(2), two equivalent I(3), two equivalent I(4), and two equivalent I(5) atoms. In the second Sr site, Sr(2) is bonded to one I(2), one I(3), one I(4), two equivalent I(1), and two equivalent I(5) atoms to form distorted edge-sharing SrI7 pentagonal bipyramids. There are five inequivalent I sites. In the first I site, I(1) is bonded to two equivalent K(1) and two equivalent Sr(2) atoms to form distorted IK2Sr2 trigonal pyramids that share corners with two equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with four equivalent I(5)Sr4 tetrahedra, corners with two equivalent I(2)K2Sr3 trigonal bipyramids, corners with two equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(3)K2Sr3 square pyramids, edges with two equivalent I(2)K2Sr3 trigonal bipyramids, and  an edgeedge with one I(1)K2Sr2 trigonal pyramid. In the second I site, I(2) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form distorted IK2Sr3 trigonal bipyramids that share  a cornercorner with one I(3)K2Sr3 square pyramid, corners with five equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra, corners with four equivalent I(2)K2Sr3 trigonal bipyramids, corners with two equivalent I(1)K2Sr2 trigonal pyramids, edges with two equivalent I(4)K2Sr3 square pyramids, edges with four equivalent I(3)K2Sr3 square pyramids, edges with two equivalent I(5)Sr4 tetrahedra, and edges with two equivalent I(1)K2Sr2 trigonal pyramids. In the third I site, I(3) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form IK2Sr3 square pyramids that share corners with four equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra,  a cornercorner with one I(2)K2Sr3 trigonal bipyramid, corners with two equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(5)Sr4 tetrahedra, edges with four equivalent I(2)K2Sr3 trigonal bipyramids, edges with two equivalent I(1)K2Sr2 trigonal pyramids, and  a faceface with one I(4)K2Sr3 square pyramid. In the fourth I site, I(4) is bonded to two equivalent K(1), one Sr(2), and two equivalent Sr(1) atoms to form IK2Sr3 square pyramids that share corners with four equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(5)Sr4 tetrahedra, corners with five equivalent I(2)K2Sr3 trigonal bipyramids, corners with four equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(3)K2Sr3 square pyramid, edges with two equivalent I(4)K2Sr3 square pyramids,  an edgeedge with one I(5)Sr4 tetrahedra, edges with two equivalent I(2)K2Sr3 trigonal bipyramids,  an edgeedge with one I(1)K2Sr2 trigonal pyramid, and  a faceface with one I(3)K2Sr3 square pyramid. In the fifth I site, I(5) is bonded to two equivalent Sr(1) and two equivalent Sr(2) atoms to form distorted ISr4 tetrahedra that share corners with two equivalent I(3)K2Sr3 square pyramids, corners with four equivalent I(4)K2Sr3 square pyramids, corners with two equivalent I(5)Sr4 tetrahedra, corners with two equivalent I(2)K2Sr3 trigonal bipyramids, corners with four equivalent I(1)K2Sr2 trigonal pyramids,  an edgeedge with one I(4)K2Sr3 square pyramid, edges with two equivalent I(3)K2Sr3 square pyramids,  an edgeedge with one I(5)Sr4 tetrahedra, and edges with two equivalent I(2)K2Sr3 trigonal bipyramids. is represented by the Crystallographic Information File (CIF) [CIF]
data_KSr2I5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.078
_cell_length_b   9.986
_cell_length_c   14.511
_cell_angle_alpha   90.015
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1315.420
_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  0.035  0.504  0.326  1.0
  K  K1  1  0.965  0.496  0.674  1.0
  K  K2  1  0.535  0.496  0.174  1.0
  K  K3  1  0.465  0.504  0.826  1.0
  Sr  Sr4  1  0.021  0.003  0.320  1.0
  Sr  Sr5  1  0.979  0.997  0.680  1.0
  Sr  Sr6  1  0.521  0.997  0.180  1.0
  Sr  Sr7  1  0.479  0.003  0.820  1.0
  Sr  Sr8  1  0.074  0.251  0.005  1.0
  Sr  Sr9  1  0.926  0.749  0.995  1.0
  Sr  Sr10  1  0.574  0.749  0.495  1.0
  Sr  Sr11  1  0.426  0.251  0.505  1.0
  I  I12  1  0.169  0.540  0.092  1.0
  I  I13  1  0.831  0.460  0.908  1.0
  I  I14  1  0.669  0.460  0.408  1.0
  I  I15  1  0.331  0.540  0.592  1.0
  I  I16  1  0.831  0.224  0.181  1.0
  I  I17  1  0.169  0.776  0.819  1.0
  I  I18  1  0.331  0.776  0.319  1.0
  I  I19  1  0.669  0.224  0.681  1.0
  I  I20  1  0.305  0.233  0.284  1.0
  I  I21  1  0.695  0.767  0.716  1.0
  I  I22  1  0.805  0.767  0.216  1.0
  I  I23  1  0.195  0.233  0.784  1.0
  I  I24  1  0.458  0.221  0.003  1.0
  I  I25  1  0.542  0.779  0.997  1.0
  I  I26  1  0.958  0.779  0.497  1.0
  I  I27  1  0.042  0.221  0.503  1.0
  I  I28  1  0.659  0.042  0.400  1.0
  I  I29  1  0.341  0.958  0.600  1.0
  I  I30  1  0.159  0.958  0.100  1.0
  I  I31  1  0.841  0.042  0.900  1.0
[/CIF]
.