The structure described by ThLa2Se5 crystallizes in the orthorhombic Pnma space group. Th(1) is bonded to one Se(2), one Se(3), one Se(4), and four equivalent Se(1) atoms to form distorted edge-sharing ThSe7 pentagonal bipyramids. La(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Th(1) and two equivalent La(1) atoms to form distorted SeLa2Th2 trigonal pyramids that share corners with two equivalent Se(4)La4Th square pyramids, corners with four equivalent Se(3)La4Th square pyramids, corners with two equivalent Se(2)La4Th trigonal bipyramids, corners with six equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(3)La4Th square pyramid, edges with two equivalent Se(4)La4Th square pyramids, edges with two equivalent Se(2)La4Th trigonal bipyramids, and  an edgeedge with one Se(1)La2Th2 trigonal pyramid. In the second Se site, Se(2) is bonded to one Th(1) and four equivalent La(1) atoms to form distorted SeLa4Th trigonal bipyramids that share  a cornercorner with one Se(4)La4Th square pyramid, corners with five equivalent Se(3)La4Th square pyramids, corners with four equivalent Se(2)La4Th trigonal bipyramids, corners with four equivalent Se(1)La2Th2 trigonal pyramids, edges with two equivalent Se(3)La4Th square pyramids, edges with four equivalent Se(4)La4Th square pyramids, and edges with four equivalent Se(1)La2Th2 trigonal pyramids. In the third Se site, Se(3) is bonded to one Th(1) and four equivalent La(1) atoms to form SeLa4Th square pyramids that share corners with four equivalent Se(4)La4Th square pyramids, corners with five equivalent Se(2)La4Th trigonal bipyramids, corners with eight equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(4)La4Th square pyramid, edges with two equivalent Se(3)La4Th square pyramids, edges with two equivalent Se(2)La4Th trigonal bipyramids, edges with two equivalent Se(1)La2Th2 trigonal pyramids, and  a faceface with one Se(4)La4Th square pyramid. In the fourth Se site, Se(4) is bonded to one Th(1) and four equivalent La(1) atoms to form distorted SeLa4Th square pyramids that share corners with four equivalent Se(3)La4Th square pyramids, corners with four equivalent Se(4)La4Th square pyramids,  a cornercorner with one Se(2)La4Th trigonal bipyramid, corners with four equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(3)La4Th square pyramid, edges with four equivalent Se(2)La4Th trigonal bipyramids, edges with four equivalent Se(1)La2Th2 trigonal pyramids, and  a faceface with one Se(3)La4Th square pyramid. is represented by the CIF file [CIF]
data_La2ThSe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.980
_cell_length_b   8.696
_cell_length_c   12.685
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   880.328
_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
  La  La0  1  0.524  0.500  0.322  1.0
  La  La1  1  0.976  1.000  0.822  1.0
  La  La2  1  0.476  0.000  0.678  1.0
  La  La3  1  0.024  0.500  0.178  1.0
  La  La4  1  0.476  0.500  0.678  1.0
  La  La5  1  0.024  0.000  0.178  1.0
  La  La6  1  0.524  1.000  0.322  1.0
  La  La7  1  0.976  0.500  0.822  1.0
  Th  Th8  1  0.074  0.750  0.492  1.0
  Th  Th9  1  0.426  0.750  0.992  1.0
  Th  Th10  1  0.926  0.250  0.508  1.0
  Th  Th11  1  0.574  0.250  0.008  1.0
  Se  Se12  1  0.835  0.958  0.597  1.0
  Se  Se13  1  0.665  0.542  0.097  1.0
  Se  Se14  1  0.165  0.458  0.403  1.0
  Se  Se15  1  0.335  0.042  0.903  1.0
  Se  Se16  1  0.165  0.042  0.403  1.0
  Se  Se17  1  0.335  0.458  0.903  1.0
  Se  Se18  1  0.835  0.542  0.597  1.0
  Se  Se19  1  0.665  0.958  0.097  1.0
  Se  Se20  1  0.832  0.750  0.313  1.0
  Se  Se21  1  0.668  0.750  0.813  1.0
  Se  Se22  1  0.168  0.250  0.687  1.0
  Se  Se23  1  0.332  0.250  0.187  1.0
  Se  Se24  1  0.457  0.750  0.498  1.0
  Se  Se25  1  0.043  0.750  0.998  1.0
  Se  Se26  1  0.543  0.250  0.502  1.0
  Se  Se27  1  0.957  0.250  0.002  1.0
  Se  Se28  1  0.195  0.750  0.716  1.0
  Se  Se29  1  0.305  0.750  0.216  1.0
  Se  Se30  1  0.805  0.250  0.284  1.0
  Se  Se31  1  0.695  0.250  0.784  1.0
[/CIF]
.
The structure described by ThLa2Se5 crystallizes in the orthorhombic Pnma space group. Th(1) is bonded to one Se(2), one Se(3), one Se(4), and four equivalent Se(1) atoms to form distorted edge-sharing ThSe7 pentagonal bipyramids. La(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Th(1) and two equivalent La(1) atoms to form distorted SeLa2Th2 trigonal pyramids that share corners with two equivalent Se(4)La4Th square pyramids, corners with four equivalent Se(3)La4Th square pyramids, corners with two equivalent Se(2)La4Th trigonal bipyramids, corners with six equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(3)La4Th square pyramid, edges with two equivalent Se(4)La4Th square pyramids, edges with two equivalent Se(2)La4Th trigonal bipyramids, and  an edgeedge with one Se(1)La2Th2 trigonal pyramid. In the second Se site, Se(2) is bonded to one Th(1) and four equivalent La(1) atoms to form distorted SeLa4Th trigonal bipyramids that share  a cornercorner with one Se(4)La4Th square pyramid, corners with five equivalent Se(3)La4Th square pyramids, corners with four equivalent Se(2)La4Th trigonal bipyramids, corners with four equivalent Se(1)La2Th2 trigonal pyramids, edges with two equivalent Se(3)La4Th square pyramids, edges with four equivalent Se(4)La4Th square pyramids, and edges with four equivalent Se(1)La2Th2 trigonal pyramids. In the third Se site, Se(3) is bonded to one Th(1) and four equivalent La(1) atoms to form SeLa4Th square pyramids that share corners with four equivalent Se(4)La4Th square pyramids, corners with five equivalent Se(2)La4Th trigonal bipyramids, corners with eight equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(4)La4Th square pyramid, edges with two equivalent Se(3)La4Th square pyramids, edges with two equivalent Se(2)La4Th trigonal bipyramids, edges with two equivalent Se(1)La2Th2 trigonal pyramids, and  a faceface with one Se(4)La4Th square pyramid. In the fourth Se site, Se(4) is bonded to one Th(1) and four equivalent La(1) atoms to form distorted SeLa4Th square pyramids that share corners with four equivalent Se(3)La4Th square pyramids, corners with four equivalent Se(4)La4Th square pyramids,  a cornercorner with one Se(2)La4Th trigonal bipyramid, corners with four equivalent Se(1)La2Th2 trigonal pyramids,  an edgeedge with one Se(3)La4Th square pyramid, edges with four equivalent Se(2)La4Th trigonal bipyramids, edges with four equivalent Se(1)La2Th2 trigonal pyramids, and  a faceface with one Se(3)La4Th square pyramid. is represented by the CIF file [CIF]
data_La2ThSe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.980
_cell_length_b   8.696
_cell_length_c   12.685
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   880.328
_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
  La  La0  1  0.524  0.500  0.322  1.0
  La  La1  1  0.976  1.000  0.822  1.0
  La  La2  1  0.476  0.000  0.678  1.0
  La  La3  1  0.024  0.500  0.178  1.0
  La  La4  1  0.476  0.500  0.678  1.0
  La  La5  1  0.024  0.000  0.178  1.0
  La  La6  1  0.524  1.000  0.322  1.0
  La  La7  1  0.976  0.500  0.822  1.0
  Th  Th8  1  0.074  0.750  0.492  1.0
  Th  Th9  1  0.426  0.750  0.992  1.0
  Th  Th10  1  0.926  0.250  0.508  1.0
  Th  Th11  1  0.574  0.250  0.008  1.0
  Se  Se12  1  0.835  0.958  0.597  1.0
  Se  Se13  1  0.665  0.542  0.097  1.0
  Se  Se14  1  0.165  0.458  0.403  1.0
  Se  Se15  1  0.335  0.042  0.903  1.0
  Se  Se16  1  0.165  0.042  0.403  1.0
  Se  Se17  1  0.335  0.458  0.903  1.0
  Se  Se18  1  0.835  0.542  0.597  1.0
  Se  Se19  1  0.665  0.958  0.097  1.0
  Se  Se20  1  0.832  0.750  0.313  1.0
  Se  Se21  1  0.668  0.750  0.813  1.0
  Se  Se22  1  0.168  0.250  0.687  1.0
  Se  Se23  1  0.332  0.250  0.187  1.0
  Se  Se24  1  0.457  0.750  0.498  1.0
  Se  Se25  1  0.043  0.750  0.998  1.0
  Se  Se26  1  0.543  0.250  0.502  1.0
  Se  Se27  1  0.957  0.250  0.002  1.0
  Se  Se28  1  0.195  0.750  0.716  1.0
  Se  Se29  1  0.305  0.750  0.216  1.0
  Se  Se30  1  0.805  0.250  0.284  1.0
  Se  Se31  1  0.695  0.250  0.784  1.0
[/CIF]
.