The crystal structure described by Th(As4O9)2 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one O(3), one O(6), and one O(7) atom. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(7) atom. In the third As site, As(3) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(4), and one O(8) atom. In the fourth As site, As(4) is bonded in a tetrahedral geometry to one O(3), one O(5), one O(6), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(3) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the third O site, O(9) is bonded in a distorted single-bond geometry to one Th(1) and one As(4) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the fifth O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(4) atom. In the sixth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(3) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(4) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one As(1) and one As(4) atom. In the ninth O site, O(7) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. is represented by the CIF card [CIF]
data_Th(As4O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.502
_cell_length_b   9.502
_cell_length_c   17.392
_cell_angle_alpha   81.305
_cell_angle_beta   81.305
_cell_angle_gamma   31.901
_symmetry_Int_Tables_number   1
_cell_volume   819.566
_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
  Th  Th0  1  0.279  0.721  0.250  1.0
  Th  Th1  1  0.721  0.279  0.750  1.0
  As  As2  1  0.695  0.057  0.980  1.0
  As  As3  1  0.943  0.305  0.520  1.0
  As  As4  1  0.305  0.943  0.020  1.0
  As  As5  1  0.057  0.695  0.480  1.0
  As  As6  1  0.952  0.670  0.137  1.0
  As  As7  1  0.330  0.048  0.363  1.0
  As  As8  1  0.048  0.330  0.863  1.0
  As  As9  1  0.670  0.952  0.637  1.0
  As  As10  1  0.934  0.367  0.223  1.0
  As  As11  1  0.633  0.066  0.277  1.0
  As  As12  1  0.066  0.633  0.777  1.0
  As  As13  1  0.367  0.934  0.723  1.0
  As  As14  1  0.772  0.225  0.092  1.0
  As  As15  1  0.775  0.228  0.408  1.0
  As  As16  1  0.228  0.775  0.908  1.0
  As  As17  1  0.225  0.772  0.592  1.0
  O  O18  1  0.911  0.513  0.141  1.0
  O  O19  1  0.487  0.089  0.359  1.0
  O  O20  1  0.089  0.487  0.859  1.0
  O  O21  1  0.513  0.911  0.641  1.0
  O  O22  1  0.113  0.304  0.284  1.0
  O  O23  1  0.696  0.887  0.216  1.0
  O  O24  1  0.887  0.696  0.716  1.0
  O  O25  1  0.304  0.113  0.784  1.0
  O  O26  1  0.955  0.185  0.023  1.0
  O  O27  1  0.815  0.045  0.477  1.0
  O  O28  1  0.045  0.815  0.977  1.0
  O  O29  1  0.185  0.955  0.523  1.0
  O  O30  1  0.636  0.578  0.266  1.0
  O  O31  1  0.422  0.364  0.234  1.0
  O  O32  1  0.364  0.422  0.734  1.0
  O  O33  1  0.578  0.636  0.766  1.0
  O  O34  1  0.558  0.507  0.135  1.0
  O  O35  1  0.493  0.442  0.365  1.0
  O  O36  1  0.442  0.493  0.865  1.0
  O  O37  1  0.507  0.558  0.635  1.0
  O  O38  1  0.581  0.289  0.038  1.0
  O  O39  1  0.711  0.419  0.462  1.0
  O  O40  1  0.419  0.711  0.962  1.0
  O  O41  1  0.289  0.581  0.538  1.0
  O  O42  1  0.731  0.885  0.058  1.0
  O  O43  1  0.115  0.269  0.442  1.0
  O  O44  1  0.269  0.115  0.942  1.0
  O  O45  1  0.885  0.731  0.558  1.0
  O  O46  1  0.107  0.088  0.191  1.0
  O  O47  1  0.912  0.893  0.309  1.0
  O  O48  1  0.893  0.912  0.809  1.0
  O  O49  1  0.088  0.107  0.691  1.0
  O  O50  1  0.965  0.948  0.148  1.0
  O  O51  1  0.052  0.035  0.352  1.0
  O  O52  1  0.035  0.052  0.852  1.0
  O  O53  1  0.948  0.965  0.648  1.0
[/CIF]
.
The crystal structure described by Th(As4O9)2 crystallizes in the monoclinic C2/c space group. Th(1) is bonded in a 8-coordinate geometry to two equivalent O(4), two equivalent O(5), two equivalent O(8), and two equivalent O(9) atoms. There are four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one O(3), one O(6), and one O(7) atom. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(7) atom. In the third As site, As(3) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(4), and one O(8) atom. In the fourth As site, As(4) is bonded in a tetrahedral geometry to one O(3), one O(5), one O(6), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(3) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the third O site, O(9) is bonded in a distorted single-bond geometry to one Th(1) and one As(4) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the fifth O site, O(3) is bonded in a bent 120 degrees geometry to one As(1) and one As(4) atom. In the sixth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(3) atom. In the seventh O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Th(1) and one As(4) atom. In the eighth O site, O(6) is bonded in a bent 120 degrees geometry to one As(1) and one As(4) atom. In the ninth O site, O(7) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. is represented by the CIF card [CIF]
data_Th(As4O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.502
_cell_length_b   9.502
_cell_length_c   17.392
_cell_angle_alpha   81.305
_cell_angle_beta   81.305
_cell_angle_gamma   31.901
_symmetry_Int_Tables_number   1
_cell_volume   819.566
_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
  Th  Th0  1  0.279  0.721  0.250  1.0
  Th  Th1  1  0.721  0.279  0.750  1.0
  As  As2  1  0.695  0.057  0.980  1.0
  As  As3  1  0.943  0.305  0.520  1.0
  As  As4  1  0.305  0.943  0.020  1.0
  As  As5  1  0.057  0.695  0.480  1.0
  As  As6  1  0.952  0.670  0.137  1.0
  As  As7  1  0.330  0.048  0.363  1.0
  As  As8  1  0.048  0.330  0.863  1.0
  As  As9  1  0.670  0.952  0.637  1.0
  As  As10  1  0.934  0.367  0.223  1.0
  As  As11  1  0.633  0.066  0.277  1.0
  As  As12  1  0.066  0.633  0.777  1.0
  As  As13  1  0.367  0.934  0.723  1.0
  As  As14  1  0.772  0.225  0.092  1.0
  As  As15  1  0.775  0.228  0.408  1.0
  As  As16  1  0.228  0.775  0.908  1.0
  As  As17  1  0.225  0.772  0.592  1.0
  O  O18  1  0.911  0.513  0.141  1.0
  O  O19  1  0.487  0.089  0.359  1.0
  O  O20  1  0.089  0.487  0.859  1.0
  O  O21  1  0.513  0.911  0.641  1.0
  O  O22  1  0.113  0.304  0.284  1.0
  O  O23  1  0.696  0.887  0.216  1.0
  O  O24  1  0.887  0.696  0.716  1.0
  O  O25  1  0.304  0.113  0.784  1.0
  O  O26  1  0.955  0.185  0.023  1.0
  O  O27  1  0.815  0.045  0.477  1.0
  O  O28  1  0.045  0.815  0.977  1.0
  O  O29  1  0.185  0.955  0.523  1.0
  O  O30  1  0.636  0.578  0.266  1.0
  O  O31  1  0.422  0.364  0.234  1.0
  O  O32  1  0.364  0.422  0.734  1.0
  O  O33  1  0.578  0.636  0.766  1.0
  O  O34  1  0.558  0.507  0.135  1.0
  O  O35  1  0.493  0.442  0.365  1.0
  O  O36  1  0.442  0.493  0.865  1.0
  O  O37  1  0.507  0.558  0.635  1.0
  O  O38  1  0.581  0.289  0.038  1.0
  O  O39  1  0.711  0.419  0.462  1.0
  O  O40  1  0.419  0.711  0.962  1.0
  O  O41  1  0.289  0.581  0.538  1.0
  O  O42  1  0.731  0.885  0.058  1.0
  O  O43  1  0.115  0.269  0.442  1.0
  O  O44  1  0.269  0.115  0.942  1.0
  O  O45  1  0.885  0.731  0.558  1.0
  O  O46  1  0.107  0.088  0.191  1.0
  O  O47  1  0.912  0.893  0.309  1.0
  O  O48  1  0.893  0.912  0.809  1.0
  O  O49  1  0.088  0.107  0.691  1.0
  O  O50  1  0.965  0.948  0.148  1.0
  O  O51  1  0.052  0.035  0.352  1.0
  O  O52  1  0.035  0.052  0.852  1.0
  O  O53  1  0.948  0.965  0.648  1.0
[/CIF]
.