The crystal structure described by TiAs2O7 crystallizes in the monoclinic C2/c space group. Ti(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TiO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ti(1) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_TiAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.273
_cell_length_b   5.273
_cell_length_c   9.487
_cell_angle_alpha   80.854
_cell_angle_beta   80.854
_cell_angle_gamma   98.147
_symmetry_Int_Tables_number   1
_cell_volume   253.323
_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
  Ti  Ti0  1  0.000  0.000  0.000  1.0
  Ti  Ti1  1  0.000  0.000  0.500  1.0
  As  As2  1  0.172  0.438  0.199  1.0
  As  As3  1  0.438  0.172  0.699  1.0
  As  As4  1  0.562  0.828  0.301  1.0
  As  As5  1  0.828  0.562  0.801  1.0
  O  O6  1  0.075  0.713  0.131  1.0
  O  O7  1  0.766  0.751  0.924  1.0
  O  O8  1  0.290  0.967  0.854  1.0
  O  O9  1  0.033  0.710  0.646  1.0
  O  O10  1  0.473  0.527  0.250  1.0
  O  O11  1  0.713  0.075  0.631  1.0
  O  O12  1  0.751  0.766  0.424  1.0
  O  O13  1  0.249  0.234  0.576  1.0
  O  O14  1  0.234  0.249  0.076  1.0
  O  O15  1  0.710  0.033  0.146  1.0
  O  O16  1  0.925  0.287  0.869  1.0
  O  O17  1  0.967  0.290  0.354  1.0
  O  O18  1  0.287  0.925  0.369  1.0
  O  O19  1  0.527  0.473  0.750  1.0
[/CIF]
.
The crystal structure described by TiAs2O7 crystallizes in the monoclinic C2/c space group. Ti(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form TiO6 octahedra that share corners with six equivalent As(1)O4 tetrahedra. As(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 17-50°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ti(1) and one As(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent As(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_TiAs2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.273
_cell_length_b   5.273
_cell_length_c   9.487
_cell_angle_alpha   80.854
_cell_angle_beta   80.854
_cell_angle_gamma   98.147
_symmetry_Int_Tables_number   1
_cell_volume   253.323
_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
  Ti  Ti0  1  0.000  0.000  0.000  1.0
  Ti  Ti1  1  0.000  0.000  0.500  1.0
  As  As2  1  0.172  0.438  0.199  1.0
  As  As3  1  0.438  0.172  0.699  1.0
  As  As4  1  0.562  0.828  0.301  1.0
  As  As5  1  0.828  0.562  0.801  1.0
  O  O6  1  0.075  0.713  0.131  1.0
  O  O7  1  0.766  0.751  0.924  1.0
  O  O8  1  0.290  0.967  0.854  1.0
  O  O9  1  0.033  0.710  0.646  1.0
  O  O10  1  0.473  0.527  0.250  1.0
  O  O11  1  0.713  0.075  0.631  1.0
  O  O12  1  0.751  0.766  0.424  1.0
  O  O13  1  0.249  0.234  0.576  1.0
  O  O14  1  0.234  0.249  0.076  1.0
  O  O15  1  0.710  0.033  0.146  1.0
  O  O16  1  0.925  0.287  0.869  1.0
  O  O17  1  0.967  0.290  0.354  1.0
  O  O18  1  0.287  0.925  0.369  1.0
  O  O19  1  0.527  0.473  0.750  1.0
[/CIF]
.