The material described by SnAs2O7 crystallizes in the monoclinic P2_1/c space group. Sn(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form SnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with two equivalent Sn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent Sn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(1) atom. In the second O site, O(7) is bonded in a bent 120 degrees geometry to one Sn(1) and one As(2) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one As(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(1) atom. In the fifth O site, O(3) is bonded in a single-bond geometry to one As(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one As(1) and one As(2) atom. In the seventh O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SnAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.321
_cell_length_b   7.279
_cell_length_c   9.747
_cell_angle_alpha   73.649
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   634.594
_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  0.929  0.189  0.713  1.0
  Sn  Sn1  1  0.429  0.811  0.787  1.0
  Sn  Sn2  1  0.071  0.811  0.287  1.0
  Sn  Sn3  1  0.571  0.189  0.213  1.0
  As  As4  1  0.750  0.586  0.754  1.0
  As  As5  1  0.250  0.414  0.746  1.0
  As  As6  1  0.250  0.414  0.246  1.0
  As  As7  1  0.750  0.586  0.254  1.0
  As  As8  1  0.707  0.964  0.967  1.0
  As  As9  1  0.207  0.036  0.533  1.0
  As  As10  1  0.293  0.036  0.033  1.0
  As  As11  1  0.793  0.964  0.467  1.0
  O  O12  1  0.682  0.148  0.043  1.0
  O  O13  1  0.182  0.852  0.457  1.0
  O  O14  1  0.318  0.852  0.957  1.0
  O  O15  1  0.818  0.148  0.543  1.0
  O  O16  1  0.566  0.628  0.733  1.0
  O  O17  1  0.066  0.372  0.767  1.0
  O  O18  1  0.434  0.372  0.267  1.0
  O  O19  1  0.934  0.628  0.233  1.0
  O  O20  1  0.827  0.619  0.896  1.0
  O  O21  1  0.327  0.381  0.604  1.0
  O  O22  1  0.173  0.381  0.104  1.0
  O  O23  1  0.673  0.619  0.396  1.0
  O  O24  1  0.835  0.750  0.594  1.0
  O  O25  1  0.335  0.250  0.906  1.0
  O  O26  1  0.165  0.250  0.406  1.0
  O  O27  1  0.665  0.750  0.094  1.0
  O  O28  1  0.907  0.981  0.326  1.0
  O  O29  1  0.407  0.019  0.174  1.0
  O  O30  1  0.093  0.019  0.674  1.0
  O  O31  1  0.593  0.981  0.826  1.0
  O  O32  1  0.736  0.371  0.213  1.0
  O  O33  1  0.236  0.629  0.287  1.0
  O  O34  1  0.264  0.629  0.787  1.0
  O  O35  1  0.764  0.371  0.713  1.0
  O  O36  1  0.621  0.996  0.402  1.0
  O  O37  1  0.121  0.004  0.098  1.0
  O  O38  1  0.379  0.004  0.598  1.0
  O  O39  1  0.879  0.996  0.902  1.0
[/CIF]
.
The material described by SnAs2O7 crystallizes in the monoclinic P2_1/c space group. Sn(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form SnO5 trigonal bipyramids that share corners with two equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with two equivalent Sn(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(1), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with three equivalent Sn(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(1) atom. In the second O site, O(7) is bonded in a bent 120 degrees geometry to one Sn(1) and one As(2) atom. In the third O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one As(2) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(1) atom. In the fifth O site, O(3) is bonded in a single-bond geometry to one As(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one As(1) and one As(2) atom. In the seventh O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one As(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_SnAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.321
_cell_length_b   7.279
_cell_length_c   9.747
_cell_angle_alpha   73.649
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   634.594
_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  0.929  0.189  0.713  1.0
  Sn  Sn1  1  0.429  0.811  0.787  1.0
  Sn  Sn2  1  0.071  0.811  0.287  1.0
  Sn  Sn3  1  0.571  0.189  0.213  1.0
  As  As4  1  0.750  0.586  0.754  1.0
  As  As5  1  0.250  0.414  0.746  1.0
  As  As6  1  0.250  0.414  0.246  1.0
  As  As7  1  0.750  0.586  0.254  1.0
  As  As8  1  0.707  0.964  0.967  1.0
  As  As9  1  0.207  0.036  0.533  1.0
  As  As10  1  0.293  0.036  0.033  1.0
  As  As11  1  0.793  0.964  0.467  1.0
  O  O12  1  0.682  0.148  0.043  1.0
  O  O13  1  0.182  0.852  0.457  1.0
  O  O14  1  0.318  0.852  0.957  1.0
  O  O15  1  0.818  0.148  0.543  1.0
  O  O16  1  0.566  0.628  0.733  1.0
  O  O17  1  0.066  0.372  0.767  1.0
  O  O18  1  0.434  0.372  0.267  1.0
  O  O19  1  0.934  0.628  0.233  1.0
  O  O20  1  0.827  0.619  0.896  1.0
  O  O21  1  0.327  0.381  0.604  1.0
  O  O22  1  0.173  0.381  0.104  1.0
  O  O23  1  0.673  0.619  0.396  1.0
  O  O24  1  0.835  0.750  0.594  1.0
  O  O25  1  0.335  0.250  0.906  1.0
  O  O26  1  0.165  0.250  0.406  1.0
  O  O27  1  0.665  0.750  0.094  1.0
  O  O28  1  0.907  0.981  0.326  1.0
  O  O29  1  0.407  0.019  0.174  1.0
  O  O30  1  0.093  0.019  0.674  1.0
  O  O31  1  0.593  0.981  0.826  1.0
  O  O32  1  0.736  0.371  0.213  1.0
  O  O33  1  0.236  0.629  0.287  1.0
  O  O34  1  0.264  0.629  0.787  1.0
  O  O35  1  0.764  0.371  0.713  1.0
  O  O36  1  0.621  0.996  0.402  1.0
  O  O37  1  0.121  0.004  0.098  1.0
  O  O38  1  0.379  0.004  0.598  1.0
  O  O39  1  0.879  0.996  0.902  1.0
[/CIF]
.