The material structure described by Li2S2O7 crystallizes in the orthorhombic Pnma space group. Li(1) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form LiO5 trigonal bipyramids that share corners with two equivalent S(1)O4 tetrahedra, corners with three equivalent S(2)O4 tetrahedra, and edges with two equivalent Li(1)O5 trigonal bipyramids. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SO4 tetrahedra that share  a cornercorner with one S(2)O4 tetrahedra and corners with four equivalent Li(1)O5 trigonal bipyramids. In the second S site, S(2) is bonded to one O(3), one O(5), and two equivalent O(4) atoms to form SO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra and corners with six equivalent Li(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one S(2) atom. In the second O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one S(2) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Li(1) and one S(1) atom. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one S(1) atom. In the fifth O site, O(3) is bonded in a bent 120 degrees geometry to one S(1) and one S(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2S2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.932
_cell_length_b   8.370
_cell_length_c   13.357
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   551.344
_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
  Li  Li0  1  0.601  0.569  0.396  1.0
  Li  Li1  1  0.899  0.931  0.896  1.0
  Li  Li2  1  0.399  0.069  0.604  1.0
  Li  Li3  1  0.101  0.431  0.104  1.0
  Li  Li4  1  0.399  0.431  0.604  1.0
  Li  Li5  1  0.101  0.069  0.104  1.0
  Li  Li6  1  0.601  0.931  0.396  1.0
  Li  Li7  1  0.899  0.569  0.896  1.0
  S  S8  1  0.778  0.250  0.284  1.0
  S  S9  1  0.722  0.250  0.784  1.0
  S  S10  1  0.222  0.750  0.716  1.0
  S  S11  1  0.278  0.750  0.216  1.0
  S  S12  1  0.885  0.250  0.496  1.0
  S  S13  1  0.615  0.250  0.996  1.0
  S  S14  1  0.115  0.750  0.504  1.0
  S  S15  1  0.385  0.750  0.004  1.0
  O  O16  1  0.624  0.397  0.294  1.0
  O  O17  1  0.876  0.103  0.794  1.0
  O  O18  1  0.376  0.897  0.706  1.0
  O  O19  1  0.124  0.603  0.206  1.0
  O  O20  1  0.376  0.603  0.706  1.0
  O  O21  1  0.124  0.897  0.206  1.0
  O  O22  1  0.624  0.103  0.294  1.0
  O  O23  1  0.876  0.397  0.794  1.0
  O  O24  1  0.970  0.250  0.201  1.0
  O  O25  1  0.530  0.250  0.701  1.0
  O  O26  1  0.030  0.750  0.799  1.0
  O  O27  1  0.470  0.750  0.299  1.0
  O  O28  1  1.000  0.250  0.382  1.0
  O  O29  1  0.500  0.250  0.882  1.0
  O  O30  1  0.000  0.750  0.618  1.0
  O  O31  1  0.500  0.750  0.118  1.0
  O  O32  1  0.726  0.396  0.508  1.0
  O  O33  1  0.774  0.104  0.008  1.0
  O  O34  1  0.274  0.896  0.492  1.0
  O  O35  1  0.226  0.604  0.992  1.0
  O  O36  1  0.274  0.604  0.492  1.0
  O  O37  1  0.226  0.896  0.992  1.0
  O  O38  1  0.726  0.104  0.508  1.0
  O  O39  1  0.774  0.396  0.008  1.0
  O  O40  1  0.136  0.250  0.554  1.0
  O  O41  1  0.364  0.250  0.054  1.0
  O  O42  1  0.864  0.750  0.446  1.0
  O  O43  1  0.636  0.750  0.946  1.0
[/CIF]
.
The material structure described by Li2S2O7 crystallizes in the orthorhombic Pnma space group. Li(1) is bonded to one O(1), one O(2), one O(5), and two equivalent O(4) atoms to form LiO5 trigonal bipyramids that share corners with two equivalent S(1)O4 tetrahedra, corners with three equivalent S(2)O4 tetrahedra, and edges with two equivalent Li(1)O5 trigonal bipyramids. There are two inequivalent S sites. In the first S site, S(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SO4 tetrahedra that share  a cornercorner with one S(2)O4 tetrahedra and corners with four equivalent Li(1)O5 trigonal bipyramids. In the second S site, S(2) is bonded to one O(3), one O(5), and two equivalent O(4) atoms to form SO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra and corners with six equivalent Li(1)O5 trigonal bipyramids. There are five inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Li(1) and one S(2) atom. In the second O site, O(5) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one S(2) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Li(1) and one S(1) atom. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to two equivalent Li(1) and one S(1) atom. In the fifth O site, O(3) is bonded in a bent 120 degrees geometry to one S(1) and one S(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li2S2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.932
_cell_length_b   8.370
_cell_length_c   13.357
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   551.344
_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
  Li  Li0  1  0.601  0.569  0.396  1.0
  Li  Li1  1  0.899  0.931  0.896  1.0
  Li  Li2  1  0.399  0.069  0.604  1.0
  Li  Li3  1  0.101  0.431  0.104  1.0
  Li  Li4  1  0.399  0.431  0.604  1.0
  Li  Li5  1  0.101  0.069  0.104  1.0
  Li  Li6  1  0.601  0.931  0.396  1.0
  Li  Li7  1  0.899  0.569  0.896  1.0
  S  S8  1  0.778  0.250  0.284  1.0
  S  S9  1  0.722  0.250  0.784  1.0
  S  S10  1  0.222  0.750  0.716  1.0
  S  S11  1  0.278  0.750  0.216  1.0
  S  S12  1  0.885  0.250  0.496  1.0
  S  S13  1  0.615  0.250  0.996  1.0
  S  S14  1  0.115  0.750  0.504  1.0
  S  S15  1  0.385  0.750  0.004  1.0
  O  O16  1  0.624  0.397  0.294  1.0
  O  O17  1  0.876  0.103  0.794  1.0
  O  O18  1  0.376  0.897  0.706  1.0
  O  O19  1  0.124  0.603  0.206  1.0
  O  O20  1  0.376  0.603  0.706  1.0
  O  O21  1  0.124  0.897  0.206  1.0
  O  O22  1  0.624  0.103  0.294  1.0
  O  O23  1  0.876  0.397  0.794  1.0
  O  O24  1  0.970  0.250  0.201  1.0
  O  O25  1  0.530  0.250  0.701  1.0
  O  O26  1  0.030  0.750  0.799  1.0
  O  O27  1  0.470  0.750  0.299  1.0
  O  O28  1  1.000  0.250  0.382  1.0
  O  O29  1  0.500  0.250  0.882  1.0
  O  O30  1  0.000  0.750  0.618  1.0
  O  O31  1  0.500  0.750  0.118  1.0
  O  O32  1  0.726  0.396  0.508  1.0
  O  O33  1  0.774  0.104  0.008  1.0
  O  O34  1  0.274  0.896  0.492  1.0
  O  O35  1  0.226  0.604  0.992  1.0
  O  O36  1  0.274  0.604  0.492  1.0
  O  O37  1  0.226  0.896  0.992  1.0
  O  O38  1  0.726  0.104  0.508  1.0
  O  O39  1  0.774  0.396  0.008  1.0
  O  O40  1  0.136  0.250  0.554  1.0
  O  O41  1  0.364  0.250  0.054  1.0
  O  O42  1  0.864  0.750  0.446  1.0
  O  O43  1  0.636  0.750  0.946  1.0
[/CIF]
.