The crystal structure described by (VO)2P2O7 crystallizes in the orthorhombic Pbcn space group. V(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 16°. P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with four equivalent V(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-51°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(2) is bonded in a distorted linear geometry to two equivalent V(1) atoms. In the fourth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent V(1) and one P(1) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2P2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.527
_cell_length_b   8.549
_cell_length_c   9.692
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   623.695
_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
  V  V0  1  0.533  0.691  0.496  1.0
  V  V1  1  0.967  0.191  0.996  1.0
  V  V2  1  0.467  0.191  0.004  1.0
  V  V3  1  0.467  0.309  0.504  1.0
  V  V4  1  0.033  0.691  0.504  1.0
  V  V5  1  0.967  0.309  0.496  1.0
  V  V6  1  0.033  0.809  0.004  1.0
  V  V7  1  0.533  0.809  0.996  1.0
  P  P8  1  0.544  0.501  0.798  1.0
  P  P9  1  0.956  0.001  0.298  1.0
  P  P10  1  0.456  0.001  0.702  1.0
  P  P11  1  0.456  0.499  0.202  1.0
  P  P12  1  0.044  0.501  0.202  1.0
  P  P13  1  0.544  0.999  0.298  1.0
  P  P14  1  0.044  0.999  0.702  1.0
  P  P15  1  0.956  0.499  0.798  1.0
  O  O16  1  0.029  0.346  0.854  1.0
  O  O17  1  0.971  0.654  0.146  1.0
  O  O18  1  0.471  0.846  0.354  1.0
  O  O19  1  0.746  0.181  0.974  1.0
  O  O20  1  0.976  0.501  0.637  1.0
  O  O21  1  0.964  0.355  0.140  1.0
  O  O22  1  0.746  0.319  0.474  1.0
  O  O23  1  0.024  0.001  0.863  1.0
  O  O24  1  0.529  0.154  0.646  1.0
  O  O25  1  0.246  0.181  0.026  1.0
  O  O26  1  0.536  0.855  0.640  1.0
  O  O27  1  0.976  0.999  0.137  1.0
  O  O28  1  0.036  0.855  0.360  1.0
  O  O29  1  0.754  0.681  0.474  1.0
  O  O30  1  0.536  0.645  0.140  1.0
  O  O31  1  0.971  0.846  0.646  1.0
  O  O32  1  0.464  0.145  0.360  1.0
  O  O33  1  0.250  0.000  0.668  1.0
  O  O34  1  0.250  0.500  0.168  1.0
  O  O35  1  0.024  0.499  0.363  1.0
  O  O36  1  0.524  0.001  0.137  1.0
  O  O37  1  0.964  0.145  0.640  1.0
  O  O38  1  0.750  0.000  0.332  1.0
  O  O39  1  0.254  0.681  0.526  1.0
  O  O40  1  0.254  0.819  0.026  1.0
  O  O41  1  0.471  0.654  0.854  1.0
  O  O42  1  0.464  0.355  0.860  1.0
  O  O43  1  0.529  0.346  0.146  1.0
  O  O44  1  0.476  0.999  0.863  1.0
  O  O45  1  0.036  0.645  0.860  1.0
  O  O46  1  0.029  0.154  0.354  1.0
  O  O47  1  0.754  0.819  0.974  1.0
  O  O48  1  0.476  0.501  0.363  1.0
  O  O49  1  0.246  0.319  0.526  1.0
  O  O50  1  0.524  0.499  0.637  1.0
  O  O51  1  0.750  0.500  0.832  1.0
[/CIF]
.
The crystal structure described by (VO)2P2O7 crystallizes in the orthorhombic Pbcn space group. V(1) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms to form distorted VO6 octahedra that share corners with two equivalent V(1)O6 octahedra, corners with four equivalent P(1)O4 tetrahedra, and  an edgeedge with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 16°. P(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form PO4 tetrahedra that share corners with four equivalent V(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-51°. There are five inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(2) is bonded in a distorted linear geometry to two equivalent V(1) atoms. In the fourth O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent V(1) and one P(1) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V2P2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.527
_cell_length_b   8.549
_cell_length_c   9.692
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   623.695
_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
  V  V0  1  0.533  0.691  0.496  1.0
  V  V1  1  0.967  0.191  0.996  1.0
  V  V2  1  0.467  0.191  0.004  1.0
  V  V3  1  0.467  0.309  0.504  1.0
  V  V4  1  0.033  0.691  0.504  1.0
  V  V5  1  0.967  0.309  0.496  1.0
  V  V6  1  0.033  0.809  0.004  1.0
  V  V7  1  0.533  0.809  0.996  1.0
  P  P8  1  0.544  0.501  0.798  1.0
  P  P9  1  0.956  0.001  0.298  1.0
  P  P10  1  0.456  0.001  0.702  1.0
  P  P11  1  0.456  0.499  0.202  1.0
  P  P12  1  0.044  0.501  0.202  1.0
  P  P13  1  0.544  0.999  0.298  1.0
  P  P14  1  0.044  0.999  0.702  1.0
  P  P15  1  0.956  0.499  0.798  1.0
  O  O16  1  0.029  0.346  0.854  1.0
  O  O17  1  0.971  0.654  0.146  1.0
  O  O18  1  0.471  0.846  0.354  1.0
  O  O19  1  0.746  0.181  0.974  1.0
  O  O20  1  0.976  0.501  0.637  1.0
  O  O21  1  0.964  0.355  0.140  1.0
  O  O22  1  0.746  0.319  0.474  1.0
  O  O23  1  0.024  0.001  0.863  1.0
  O  O24  1  0.529  0.154  0.646  1.0
  O  O25  1  0.246  0.181  0.026  1.0
  O  O26  1  0.536  0.855  0.640  1.0
  O  O27  1  0.976  0.999  0.137  1.0
  O  O28  1  0.036  0.855  0.360  1.0
  O  O29  1  0.754  0.681  0.474  1.0
  O  O30  1  0.536  0.645  0.140  1.0
  O  O31  1  0.971  0.846  0.646  1.0
  O  O32  1  0.464  0.145  0.360  1.0
  O  O33  1  0.250  0.000  0.668  1.0
  O  O34  1  0.250  0.500  0.168  1.0
  O  O35  1  0.024  0.499  0.363  1.0
  O  O36  1  0.524  0.001  0.137  1.0
  O  O37  1  0.964  0.145  0.640  1.0
  O  O38  1  0.750  0.000  0.332  1.0
  O  O39  1  0.254  0.681  0.526  1.0
  O  O40  1  0.254  0.819  0.026  1.0
  O  O41  1  0.471  0.654  0.854  1.0
  O  O42  1  0.464  0.355  0.860  1.0
  O  O43  1  0.529  0.346  0.146  1.0
  O  O44  1  0.476  0.999  0.863  1.0
  O  O45  1  0.036  0.645  0.860  1.0
  O  O46  1  0.029  0.154  0.354  1.0
  O  O47  1  0.754  0.819  0.974  1.0
  O  O48  1  0.476  0.501  0.363  1.0
  O  O49  1  0.246  0.319  0.526  1.0
  O  O50  1  0.524  0.499  0.637  1.0
  O  O51  1  0.750  0.500  0.832  1.0
[/CIF]
.