The compound described by SnOP2O5 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(5) atoms. In the second Sn site, Sn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Sn(2)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-55°. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(2)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sn(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF file [CIF]
data_Sn(PO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.079
_cell_length_b   8.079
_cell_length_c   11.341
_cell_angle_alpha   64.049
_cell_angle_beta   64.049
_cell_angle_gamma   68.925
_symmetry_Int_Tables_number   1
_cell_volume   585.462
_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
  Sn  Sn0  1  0.011  0.989  0.250  1.0
  Sn  Sn1  1  0.000  0.500  0.500  1.0
  Sn  Sn2  1  0.500  0.000  0.000  1.0
  Sn  Sn3  1  0.989  0.011  0.750  1.0
  P  P4  1  0.688  0.679  0.811  1.0
  P  P5  1  0.272  0.706  0.980  1.0
  P  P6  1  0.679  0.688  0.311  1.0
  P  P7  1  0.294  0.728  0.520  1.0
  P  P8  1  0.706  0.272  0.479  1.0
  P  P9  1  0.321  0.312  0.689  1.0
  P  P10  1  0.728  0.294  0.021  1.0
  P  P11  1  0.312  0.321  0.189  1.0
  O  O12  1  0.787  0.641  0.677  1.0
  O  O13  1  0.291  0.784  0.071  1.0
  O  O14  1  0.468  0.683  0.854  1.0
  O  O15  1  0.853  0.711  0.317  1.0
  O  O16  1  0.119  0.807  0.915  1.0
  O  O17  1  0.784  0.291  0.571  1.0
  O  O18  1  0.247  0.491  0.063  1.0
  O  O19  1  0.193  0.881  0.585  1.0
  O  O20  1  0.509  0.753  0.437  1.0
  O  O21  1  0.641  0.787  0.177  1.0
  O  O22  1  0.317  0.532  0.646  1.0
  O  O23  1  0.289  0.147  0.183  1.0
  O  O24  1  0.711  0.853  0.817  1.0
  O  O25  1  0.683  0.468  0.354  1.0
  O  O26  1  0.359  0.213  0.823  1.0
  O  O27  1  0.491  0.247  0.563  1.0
  O  O28  1  0.807  0.119  0.415  1.0
  O  O29  1  0.753  0.509  0.937  1.0
  O  O30  1  0.216  0.709  0.429  1.0
  O  O31  1  0.881  0.193  0.085  1.0
  O  O32  1  0.147  0.289  0.683  1.0
  O  O33  1  0.532  0.317  0.146  1.0
  O  O34  1  0.709  0.216  0.929  1.0
  O  O35  1  0.213  0.359  0.323  1.0
[/CIF]
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The compound described by SnOP2O5 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to two equivalent O(4) and two equivalent O(5) atoms. In the second Sn site, Sn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra and corners with four equivalent P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Sn(2)O6 octahedra and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-55°. In the second P site, P(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Sn(2)O6 octahedra and corners with two equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 53°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sn(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sn(2) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF file [CIF]
data_Sn(PO3)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.079
_cell_length_b   8.079
_cell_length_c   11.341
_cell_angle_alpha   64.049
_cell_angle_beta   64.049
_cell_angle_gamma   68.925
_symmetry_Int_Tables_number   1
_cell_volume   585.462
_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
  Sn  Sn0  1  0.011  0.989  0.250  1.0
  Sn  Sn1  1  0.000  0.500  0.500  1.0
  Sn  Sn2  1  0.500  0.000  0.000  1.0
  Sn  Sn3  1  0.989  0.011  0.750  1.0
  P  P4  1  0.688  0.679  0.811  1.0
  P  P5  1  0.272  0.706  0.980  1.0
  P  P6  1  0.679  0.688  0.311  1.0
  P  P7  1  0.294  0.728  0.520  1.0
  P  P8  1  0.706  0.272  0.479  1.0
  P  P9  1  0.321  0.312  0.689  1.0
  P  P10  1  0.728  0.294  0.021  1.0
  P  P11  1  0.312  0.321  0.189  1.0
  O  O12  1  0.787  0.641  0.677  1.0
  O  O13  1  0.291  0.784  0.071  1.0
  O  O14  1  0.468  0.683  0.854  1.0
  O  O15  1  0.853  0.711  0.317  1.0
  O  O16  1  0.119  0.807  0.915  1.0
  O  O17  1  0.784  0.291  0.571  1.0
  O  O18  1  0.247  0.491  0.063  1.0
  O  O19  1  0.193  0.881  0.585  1.0
  O  O20  1  0.509  0.753  0.437  1.0
  O  O21  1  0.641  0.787  0.177  1.0
  O  O22  1  0.317  0.532  0.646  1.0
  O  O23  1  0.289  0.147  0.183  1.0
  O  O24  1  0.711  0.853  0.817  1.0
  O  O25  1  0.683  0.468  0.354  1.0
  O  O26  1  0.359  0.213  0.823  1.0
  O  O27  1  0.491  0.247  0.563  1.0
  O  O28  1  0.807  0.119  0.415  1.0
  O  O29  1  0.753  0.509  0.937  1.0
  O  O30  1  0.216  0.709  0.429  1.0
  O  O31  1  0.881  0.193  0.085  1.0
  O  O32  1  0.147  0.289  0.683  1.0
  O  O33  1  0.532  0.317  0.146  1.0
  O  O34  1  0.709  0.216  0.929  1.0
  O  O35  1  0.213  0.359  0.323  1.0
[/CIF]
.