The crystal structure described by LaSe2O9 crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), one O(8), one O(9), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(7) atom. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one La(1) and one Se(2) atom. In the second O site, O(7) is bonded in a single-bond geometry to one Se(2) atom. In the third O site, O(8) is bonded in a single-bond geometry to one La(1) atom. In the fourth O site, O(1) is bonded in a single-bond geometry to one Se(1) atom. In the fifth O site, O(9) is bonded in a single-bond geometry to one La(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Se(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent La(1) and one Se(1) atom. In the eighth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one La(1) and one Se(2) atom. In the ninth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one La(1) and one Se(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaSe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.393
_cell_length_b   7.441
_cell_length_c   13.436
_cell_angle_alpha   63.435
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   839.973
_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  0.100  0.692  0.064  1.0
  La  La1  1  0.400  0.692  0.564  1.0
  La  La2  1  0.900  0.308  0.936  1.0
  La  La3  1  0.600  0.308  0.436  1.0
  Se  Se4  1  0.887  0.911  0.822  1.0
  Se  Se5  1  0.613  0.911  0.322  1.0
  Se  Se6  1  0.113  0.089  0.178  1.0
  Se  Se7  1  0.387  0.089  0.678  1.0
  Se  Se8  1  0.288  0.481  0.883  1.0
  Se  Se9  1  0.212  0.481  0.383  1.0
  Se  Se10  1  0.712  0.519  0.117  1.0
  Se  Se11  1  0.788  0.519  0.617  1.0
  O  O12  1  0.972  0.997  0.701  1.0
  O  O13  1  0.528  0.997  0.201  1.0
  O  O14  1  0.028  0.003  0.299  1.0
  O  O15  1  0.472  0.003  0.799  1.0
  O  O16  1  0.930  0.660  0.903  1.0
  O  O17  1  0.570  0.660  0.403  1.0
  O  O18  1  0.070  0.340  0.097  1.0
  O  O19  1  0.430  0.340  0.597  1.0
  O  O20  1  0.963  0.003  0.907  1.0
  O  O21  1  0.537  0.003  0.407  1.0
  O  O22  1  0.037  0.997  0.093  1.0
  O  O23  1  0.463  0.997  0.593  1.0
  O  O24  1  0.247  0.667  0.917  1.0
  O  O25  1  0.253  0.667  0.417  1.0
  O  O26  1  0.753  0.333  0.083  1.0
  O  O27  1  0.747  0.333  0.583  1.0
  O  O28  1  0.138  0.381  0.862  1.0
  O  O29  1  0.362  0.381  0.362  1.0
  O  O30  1  0.862  0.619  0.138  1.0
  O  O31  1  0.638  0.619  0.638  1.0
  O  O32  1  0.371  0.587  0.759  1.0
  O  O33  1  0.129  0.587  0.259  1.0
  O  O34  1  0.629  0.413  0.241  1.0
  O  O35  1  0.871  0.413  0.741  1.0
  O  O36  1  0.386  0.304  0.981  1.0
  O  O37  1  0.114  0.304  0.481  1.0
  O  O38  1  0.614  0.696  0.019  1.0
  O  O39  1  0.886  0.696  0.519  1.0
  O  O40  1  0.315  0.448  0.144  1.0
  O  O41  1  0.185  0.448  0.644  1.0
  O  O42  1  0.685  0.552  0.856  1.0
  O  O43  1  0.815  0.552  0.356  1.0
  O  O44  1  0.345  0.887  0.040  1.0
  O  O45  1  0.155  0.887  0.540  1.0
  O  O46  1  0.655  0.113  0.960  1.0
  O  O47  1  0.845  0.113  0.460  1.0
[/CIF]
.
The crystal structure described by LaSe2O9 crystallizes in the monoclinic P2_1/c space group. La(1) is bonded in a 9-coordinate geometry to one O(4), one O(5), one O(6), one O(8), one O(9), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to one O(4), one O(5), one O(6), and one O(7) atom. There are nine inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one La(1) and one Se(2) atom. In the second O site, O(7) is bonded in a single-bond geometry to one Se(2) atom. In the third O site, O(8) is bonded in a single-bond geometry to one La(1) atom. In the fourth O site, O(1) is bonded in a single-bond geometry to one Se(1) atom. In the fifth O site, O(9) is bonded in a single-bond geometry to one La(1) atom. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to two equivalent La(1) and one Se(1) atom. In the seventh O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent La(1) and one Se(1) atom. In the eighth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one La(1) and one Se(2) atom. In the ninth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one La(1) and one Se(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_LaSe2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.393
_cell_length_b   7.441
_cell_length_c   13.436
_cell_angle_alpha   63.435
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   839.973
_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  0.100  0.692  0.064  1.0
  La  La1  1  0.400  0.692  0.564  1.0
  La  La2  1  0.900  0.308  0.936  1.0
  La  La3  1  0.600  0.308  0.436  1.0
  Se  Se4  1  0.887  0.911  0.822  1.0
  Se  Se5  1  0.613  0.911  0.322  1.0
  Se  Se6  1  0.113  0.089  0.178  1.0
  Se  Se7  1  0.387  0.089  0.678  1.0
  Se  Se8  1  0.288  0.481  0.883  1.0
  Se  Se9  1  0.212  0.481  0.383  1.0
  Se  Se10  1  0.712  0.519  0.117  1.0
  Se  Se11  1  0.788  0.519  0.617  1.0
  O  O12  1  0.972  0.997  0.701  1.0
  O  O13  1  0.528  0.997  0.201  1.0
  O  O14  1  0.028  0.003  0.299  1.0
  O  O15  1  0.472  0.003  0.799  1.0
  O  O16  1  0.930  0.660  0.903  1.0
  O  O17  1  0.570  0.660  0.403  1.0
  O  O18  1  0.070  0.340  0.097  1.0
  O  O19  1  0.430  0.340  0.597  1.0
  O  O20  1  0.963  0.003  0.907  1.0
  O  O21  1  0.537  0.003  0.407  1.0
  O  O22  1  0.037  0.997  0.093  1.0
  O  O23  1  0.463  0.997  0.593  1.0
  O  O24  1  0.247  0.667  0.917  1.0
  O  O25  1  0.253  0.667  0.417  1.0
  O  O26  1  0.753  0.333  0.083  1.0
  O  O27  1  0.747  0.333  0.583  1.0
  O  O28  1  0.138  0.381  0.862  1.0
  O  O29  1  0.362  0.381  0.362  1.0
  O  O30  1  0.862  0.619  0.138  1.0
  O  O31  1  0.638  0.619  0.638  1.0
  O  O32  1  0.371  0.587  0.759  1.0
  O  O33  1  0.129  0.587  0.259  1.0
  O  O34  1  0.629  0.413  0.241  1.0
  O  O35  1  0.871  0.413  0.741  1.0
  O  O36  1  0.386  0.304  0.981  1.0
  O  O37  1  0.114  0.304  0.481  1.0
  O  O38  1  0.614  0.696  0.019  1.0
  O  O39  1  0.886  0.696  0.519  1.0
  O  O40  1  0.315  0.448  0.144  1.0
  O  O41  1  0.185  0.448  0.644  1.0
  O  O42  1  0.685  0.552  0.856  1.0
  O  O43  1  0.815  0.552  0.356  1.0
  O  O44  1  0.345  0.887  0.040  1.0
  O  O45  1  0.155  0.887  0.540  1.0
  O  O46  1  0.655  0.113  0.960  1.0
  O  O47  1  0.845  0.113  0.460  1.0
[/CIF]
.