The material described by Sn2P2O7 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted SnO5 square pyramids that share corners with five equivalent P(1)O4 tetrahedra and edges with two equivalent Sn(1)O5 square pyramids. 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 five equivalent Sn(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. is represented by the CIF file [CIF]
data_Sn2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   5.997
_cell_length_c   9.536
_cell_angle_alpha   84.133
_cell_angle_beta   84.133
_cell_angle_gamma   107.582
_symmetry_Int_Tables_number   1
_cell_volume   321.951
_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  0.694  0.308  0.006  1.0
  Sn  Sn1  1  0.692  0.306  0.494  1.0
  Sn  Sn2  1  0.308  0.694  0.506  1.0
  Sn  Sn3  1  0.306  0.692  0.994  1.0
  P  P4  1  0.821  0.775  0.715  1.0
  P  P5  1  0.775  0.821  0.215  1.0
  P  P6  1  0.225  0.179  0.785  1.0
  P  P7  1  0.179  0.225  0.285  1.0
  O  O8  1  0.713  0.950  0.647  1.0
  O  O9  1  0.878  0.602  0.617  1.0
  O  O10  1  0.675  0.639  0.858  1.0
  O  O11  1  0.950  0.713  0.147  1.0
  O  O12  1  0.085  0.915  0.750  1.0
  O  O13  1  0.602  0.878  0.117  1.0
  O  O14  1  0.639  0.675  0.358  1.0
  O  O15  1  0.361  0.325  0.642  1.0
  O  O16  1  0.398  0.122  0.883  1.0
  O  O17  1  0.915  0.085  0.250  1.0
  O  O18  1  0.050  0.287  0.853  1.0
  O  O19  1  0.325  0.361  0.142  1.0
  O  O20  1  0.122  0.398  0.383  1.0
  O  O21  1  0.287  0.050  0.353  1.0
[/CIF]
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The material described by Sn2P2O7 crystallizes in the monoclinic C2/c space group. Sn(1) is bonded to one O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted SnO5 square pyramids that share corners with five equivalent P(1)O4 tetrahedra and edges with two equivalent Sn(1)O5 square pyramids. 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 five equivalent Sn(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. is represented by the CIF file [CIF]
data_Sn2P2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.997
_cell_length_b   5.997
_cell_length_c   9.536
_cell_angle_alpha   84.133
_cell_angle_beta   84.133
_cell_angle_gamma   107.582
_symmetry_Int_Tables_number   1
_cell_volume   321.951
_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  0.694  0.308  0.006  1.0
  Sn  Sn1  1  0.692  0.306  0.494  1.0
  Sn  Sn2  1  0.308  0.694  0.506  1.0
  Sn  Sn3  1  0.306  0.692  0.994  1.0
  P  P4  1  0.821  0.775  0.715  1.0
  P  P5  1  0.775  0.821  0.215  1.0
  P  P6  1  0.225  0.179  0.785  1.0
  P  P7  1  0.179  0.225  0.285  1.0
  O  O8  1  0.713  0.950  0.647  1.0
  O  O9  1  0.878  0.602  0.617  1.0
  O  O10  1  0.675  0.639  0.858  1.0
  O  O11  1  0.950  0.713  0.147  1.0
  O  O12  1  0.085  0.915  0.750  1.0
  O  O13  1  0.602  0.878  0.117  1.0
  O  O14  1  0.639  0.675  0.358  1.0
  O  O15  1  0.361  0.325  0.642  1.0
  O  O16  1  0.398  0.122  0.883  1.0
  O  O17  1  0.915  0.085  0.250  1.0
  O  O18  1  0.050  0.287  0.853  1.0
  O  O19  1  0.325  0.361  0.142  1.0
  O  O20  1  0.122  0.398  0.383  1.0
  O  O21  1  0.287  0.050  0.353  1.0
[/CIF]
.