The material described by Ag2S2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form distorted AgO6 pentagonal pyramids that share corners with three equivalent Ag(2)O6 octahedra, corners with two equivalent S(2)O4 tetrahedra, corners with four equivalent S(1)O4 tetrahedra,  an edgeedge with one Ag(2)O6 octahedra, and  an edgeedge with one Ag(1)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 63-71°. In the second Ag site, Ag(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form distorted AgO6 octahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids, corners with three equivalent S(1)O4 tetrahedra, corners with three equivalent S(2)O4 tetrahedra,  an edgeedge with one Ag(2)O6 octahedra, and  an edgeedge with one Ag(1)O6 pentagonal pyramid. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with three equivalent Ag(2)O6 octahedra, corners with four equivalent Ag(1)O6 pentagonal pyramids, and  a cornercorner with one S(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second S site, S(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share corners with three equivalent Ag(2)O6 octahedra, corners with two equivalent Ag(1)O6 pentagonal pyramids, and  a cornercorner with one S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-58°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ag(1), two equivalent Ag(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ag(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one S(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ag(2) and one S(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(2) atom. is represented by the CIF file [CIF]
data_Ag2S2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.807
_cell_length_b   6.749
_cell_length_c   6.908
_cell_angle_alpha   63.536
_cell_angle_beta   87.046
_cell_angle_gamma   85.086
_symmetry_Int_Tables_number   1
_cell_volume   283.010
_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
  Ag  Ag0  1  0.119  0.798  0.212  1.0
  Ag  Ag1  1  0.881  0.202  0.788  1.0
  Ag  Ag2  1  0.629  0.795  0.570  1.0
  Ag  Ag3  1  0.371  0.205  0.430  1.0
  S  S4  1  0.123  0.710  0.724  1.0
  S  S5  1  0.877  0.290  0.276  1.0
  S  S6  1  0.376  0.300  0.879  1.0
  S  S7  1  0.624  0.700  0.121  1.0
  O  O8  1  0.967  0.616  0.664  1.0
  O  O9  1  0.033  0.384  0.336  1.0
  O  O10  1  0.259  0.819  0.544  1.0
  O  O11  1  0.741  0.181  0.456  1.0
  O  O12  1  0.059  0.838  0.839  1.0
  O  O13  1  0.941  0.162  0.161  1.0
  O  O14  1  0.251  0.506  0.909  1.0
  O  O15  1  0.749  0.494  0.091  1.0
  O  O16  1  0.400  0.141  0.102  1.0
  O  O17  1  0.600  0.859  0.898  1.0
  O  O18  1  0.251  0.238  0.755  1.0
  O  O19  1  0.749  0.762  0.245  1.0
  O  O20  1  0.556  0.393  0.765  1.0
  O  O21  1  0.444  0.607  0.235  1.0
[/CIF]
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The material described by Ag2S2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form distorted AgO6 pentagonal pyramids that share corners with three equivalent Ag(2)O6 octahedra, corners with two equivalent S(2)O4 tetrahedra, corners with four equivalent S(1)O4 tetrahedra,  an edgeedge with one Ag(2)O6 octahedra, and  an edgeedge with one Ag(1)O6 pentagonal pyramid. The corner-sharing octahedral tilt angles range from 63-71°. In the second Ag site, Ag(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(2) atoms to form distorted AgO6 octahedra that share corners with three equivalent Ag(1)O6 pentagonal pyramids, corners with three equivalent S(1)O4 tetrahedra, corners with three equivalent S(2)O4 tetrahedra,  an edgeedge with one Ag(2)O6 octahedra, and  an edgeedge with one Ag(1)O6 pentagonal pyramid. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SO4 tetrahedra that share corners with three equivalent Ag(2)O6 octahedra, corners with four equivalent Ag(1)O6 pentagonal pyramids, and  a cornercorner with one S(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second S site, S(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share corners with three equivalent Ag(2)O6 octahedra, corners with two equivalent Ag(1)O6 pentagonal pyramids, and  a cornercorner with one S(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-58°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ag(1), two equivalent Ag(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ag(1) and one S(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one S(1) and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ag(2) and one S(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Ag(1), one Ag(2), and one S(2) atom. is represented by the CIF file [CIF]
data_Ag2S2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.807
_cell_length_b   6.749
_cell_length_c   6.908
_cell_angle_alpha   63.536
_cell_angle_beta   87.046
_cell_angle_gamma   85.086
_symmetry_Int_Tables_number   1
_cell_volume   283.010
_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
  Ag  Ag0  1  0.119  0.798  0.212  1.0
  Ag  Ag1  1  0.881  0.202  0.788  1.0
  Ag  Ag2  1  0.629  0.795  0.570  1.0
  Ag  Ag3  1  0.371  0.205  0.430  1.0
  S  S4  1  0.123  0.710  0.724  1.0
  S  S5  1  0.877  0.290  0.276  1.0
  S  S6  1  0.376  0.300  0.879  1.0
  S  S7  1  0.624  0.700  0.121  1.0
  O  O8  1  0.967  0.616  0.664  1.0
  O  O9  1  0.033  0.384  0.336  1.0
  O  O10  1  0.259  0.819  0.544  1.0
  O  O11  1  0.741  0.181  0.456  1.0
  O  O12  1  0.059  0.838  0.839  1.0
  O  O13  1  0.941  0.162  0.161  1.0
  O  O14  1  0.251  0.506  0.909  1.0
  O  O15  1  0.749  0.494  0.091  1.0
  O  O16  1  0.400  0.141  0.102  1.0
  O  O17  1  0.600  0.859  0.898  1.0
  O  O18  1  0.251  0.238  0.755  1.0
  O  O19  1  0.749  0.762  0.245  1.0
  O  O20  1  0.556  0.393  0.765  1.0
  O  O21  1  0.444  0.607  0.235  1.0
[/CIF]
.