The crystal structure described by SnP2O9 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-45°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(1) and one O(5) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent O(4) atoms. is represented by the CIF file [CIF]
data_SnP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.108
_cell_length_b   5.108
_cell_length_c   14.863
_cell_angle_alpha   87.040
_cell_angle_beta   87.040
_cell_angle_gamma   60.254
_symmetry_Int_Tables_number   1
_cell_volume   336.041
_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
  Sn  Sn0  1  0.000  0.500  0.000  1.0
  Sn  Sn1  1  0.500  0.000  0.500  1.0
  P  P2  1  0.353  0.854  0.889  1.0
  P  P3  1  0.146  0.647  0.611  1.0
  P  P4  1  0.647  0.146  0.111  1.0
  P  P5  1  0.854  0.353  0.389  1.0
  O  O6  1  0.289  0.607  0.927  1.0
  O  O7  1  0.393  0.711  0.573  1.0
  O  O8  1  0.711  0.393  0.073  1.0
  O  O9  1  0.607  0.289  0.427  1.0
  O  O10  1  0.091  0.175  0.907  1.0
  O  O11  1  0.825  0.909  0.593  1.0
  O  O12  1  0.909  0.825  0.093  1.0
  O  O13  1  0.175  0.091  0.407  1.0
  O  O14  1  0.651  0.816  0.924  1.0
  O  O15  1  0.184  0.349  0.576  1.0
  O  O16  1  0.349  0.184  0.076  1.0
  O  O17  1  0.816  0.651  0.424  1.0
  O  O18  1  0.407  0.827  0.783  1.0
  O  O19  1  0.173  0.593  0.717  1.0
  O  O20  1  0.593  0.173  0.217  1.0
  O  O21  1  0.827  0.407  0.283  1.0
  O  O22  1  0.628  0.372  0.750  1.0
  O  O23  1  0.372  0.628  0.250  1.0
[/CIF]
.
The crystal structure described by SnP2O9 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form SnO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-45°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one P(1) and one O(5) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to two equivalent O(4) atoms. is represented by the CIF file [CIF]
data_SnP2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.108
_cell_length_b   5.108
_cell_length_c   14.863
_cell_angle_alpha   87.040
_cell_angle_beta   87.040
_cell_angle_gamma   60.254
_symmetry_Int_Tables_number   1
_cell_volume   336.041
_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
  Sn  Sn0  1  0.000  0.500  0.000  1.0
  Sn  Sn1  1  0.500  0.000  0.500  1.0
  P  P2  1  0.353  0.854  0.889  1.0
  P  P3  1  0.146  0.647  0.611  1.0
  P  P4  1  0.647  0.146  0.111  1.0
  P  P5  1  0.854  0.353  0.389  1.0
  O  O6  1  0.289  0.607  0.927  1.0
  O  O7  1  0.393  0.711  0.573  1.0
  O  O8  1  0.711  0.393  0.073  1.0
  O  O9  1  0.607  0.289  0.427  1.0
  O  O10  1  0.091  0.175  0.907  1.0
  O  O11  1  0.825  0.909  0.593  1.0
  O  O12  1  0.909  0.825  0.093  1.0
  O  O13  1  0.175  0.091  0.407  1.0
  O  O14  1  0.651  0.816  0.924  1.0
  O  O15  1  0.184  0.349  0.576  1.0
  O  O16  1  0.349  0.184  0.076  1.0
  O  O17  1  0.816  0.651  0.424  1.0
  O  O18  1  0.407  0.827  0.783  1.0
  O  O19  1  0.173  0.593  0.717  1.0
  O  O20  1  0.593  0.173  0.217  1.0
  O  O21  1  0.827  0.407  0.283  1.0
  O  O22  1  0.628  0.372  0.750  1.0
  O  O23  1  0.372  0.628  0.250  1.0
[/CIF]
.