The structure described by K(SnSe2)2 crystallizes in the monoclinic Cm space group. K(1) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), one Se(4), two equivalent Se(1), and three equivalent Se(5) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(2), one Se(4), and two equivalent Se(3) atoms to form corner-sharing SnSe4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(3), one Se(5), and two equivalent Se(1) atoms to form corner-sharing SnSe4 tetrahedra. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to one Se(2), one Se(4), and two equivalent Se(5) atoms. There are five inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent Sn(2) atoms. In the second Se site, Se(2) is bonded to two equivalent K(1), one Sn(1), and one Sn(3) atom to form a mixture of corner and edge-sharing SeK2Sn2 trigonal pyramids. In the third Se site, Se(3) is bonded in a distorted trigonal planar geometry to one K(1), one Sn(1), and one Sn(2) atom. In the fourth Se site, Se(4) is bonded in a distorted L-shaped geometry to two equivalent K(1), one Sn(1), and one Sn(3) atom. In the fifth Se site, Se(5) is bonded to three equivalent K(1), one Sn(2), and one Sn(3) atom to form distorted SeK3Sn2 trigonal bipyramids that share corners with three equivalent Se(5)K3Sn2 trigonal bipyramids, corners with two equivalent Se(2)K2Sn2 trigonal pyramids, edges with two equivalent Se(5)K3Sn2 trigonal bipyramids, and  an edgeedge with one Se(2)K2Sn2 trigonal pyramid. is represented by the CIF file [CIF]
data_K(SnSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.545
_cell_length_b   7.531
_cell_length_c   10.124
_cell_angle_alpha   88.080
_cell_angle_beta   71.141
_cell_angle_gamma   84.050
_symmetry_Int_Tables_number   1
_cell_volume   469.642
_cell_formula_units_Z   2
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  0.968  0.035  0.687  1.0
  K  K1  1  0.655  0.035  0.313  1.0
  Sn  Sn2  1  0.412  0.626  0.000  1.0
  Sn  Sn3  1  0.141  0.443  0.377  1.0
  Sn  Sn4  1  0.518  0.443  0.623  1.0
  Sn  Sn5  1  0.311  0.132  0.000  1.0
  Se  Se6  1  0.887  0.537  0.620  1.0
  Se  Se7  1  0.508  0.537  0.380  1.0
  Se  Se8  1  0.634  0.878  0.000  1.0
  Se  Se9  1  0.044  0.651  0.196  1.0
  Se  Se10  1  0.627  0.332  0.000  1.0
  Se  Se11  1  0.469  0.122  0.672  1.0
  Se  Se12  1  0.141  0.122  0.328  1.0
  Se  Se13  1  0.240  0.651  0.804  1.0
[/CIF]
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The structure described by K(SnSe2)2 crystallizes in the monoclinic Cm space group. K(1) is bonded in a 8-coordinate geometry to one Se(2), one Se(3), one Se(4), two equivalent Se(1), and three equivalent Se(5) atoms. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one Se(2), one Se(4), and two equivalent Se(3) atoms to form corner-sharing SnSe4 tetrahedra. In the second Sn site, Sn(2) is bonded to one Se(3), one Se(5), and two equivalent Se(1) atoms to form corner-sharing SnSe4 tetrahedra. In the third Sn site, Sn(3) is bonded in a rectangular see-saw-like geometry to one Se(2), one Se(4), and two equivalent Se(5) atoms. There are five inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted water-like geometry to two equivalent K(1) and two equivalent Sn(2) atoms. In the second Se site, Se(2) is bonded to two equivalent K(1), one Sn(1), and one Sn(3) atom to form a mixture of corner and edge-sharing SeK2Sn2 trigonal pyramids. In the third Se site, Se(3) is bonded in a distorted trigonal planar geometry to one K(1), one Sn(1), and one Sn(2) atom. In the fourth Se site, Se(4) is bonded in a distorted L-shaped geometry to two equivalent K(1), one Sn(1), and one Sn(3) atom. In the fifth Se site, Se(5) is bonded to three equivalent K(1), one Sn(2), and one Sn(3) atom to form distorted SeK3Sn2 trigonal bipyramids that share corners with three equivalent Se(5)K3Sn2 trigonal bipyramids, corners with two equivalent Se(2)K2Sn2 trigonal pyramids, edges with two equivalent Se(5)K3Sn2 trigonal bipyramids, and  an edgeedge with one Se(2)K2Sn2 trigonal pyramid. is represented by the CIF file [CIF]
data_K(SnSe2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.545
_cell_length_b   7.531
_cell_length_c   10.124
_cell_angle_alpha   88.080
_cell_angle_beta   71.141
_cell_angle_gamma   84.050
_symmetry_Int_Tables_number   1
_cell_volume   469.642
_cell_formula_units_Z   2
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  0.968  0.035  0.687  1.0
  K  K1  1  0.655  0.035  0.313  1.0
  Sn  Sn2  1  0.412  0.626  0.000  1.0
  Sn  Sn3  1  0.141  0.443  0.377  1.0
  Sn  Sn4  1  0.518  0.443  0.623  1.0
  Sn  Sn5  1  0.311  0.132  0.000  1.0
  Se  Se6  1  0.887  0.537  0.620  1.0
  Se  Se7  1  0.508  0.537  0.380  1.0
  Se  Se8  1  0.634  0.878  0.000  1.0
  Se  Se9  1  0.044  0.651  0.196  1.0
  Se  Se10  1  0.627  0.332  0.000  1.0
  Se  Se11  1  0.469  0.122  0.672  1.0
  Se  Se12  1  0.141  0.122  0.328  1.0
  Se  Se13  1  0.240  0.651  0.804  1.0
[/CIF]
.