The compound described by (MoO2)2P2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. In the second Mo site, Mo(2) is bonded to one O(1), one O(10), one O(11), one O(2), one O(6), and one O(9) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(11), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Mo(1)O6 octahedra and corners with three equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-42°. In the second P site, P(2) is bonded to one O(10), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mo(2)O6 octahedra and corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-50°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Mo(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Mo(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Mo(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mo2P2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.438
_cell_length_b   7.607
_cell_length_c   9.154
_cell_angle_alpha   74.810
_cell_angle_beta   89.833
_cell_angle_gamma   89.900
_symmetry_Int_Tables_number   1
_cell_volume   432.611
_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
  Mo  Mo0  1  0.247  0.391  0.705  1.0
  Mo  Mo1  1  0.753  0.609  0.295  1.0
  Mo  Mo2  1  0.248  0.184  0.139  1.0
  Mo  Mo3  1  0.752  0.816  0.861  1.0
  P  P4  1  0.749  0.070  0.116  1.0
  P  P5  1  0.749  0.491  0.671  1.0
  P  P6  1  0.251  0.509  0.329  1.0
  P  P7  1  0.251  0.930  0.884  1.0
  O  O8  1  0.255  0.982  0.038  1.0
  O  O9  1  0.240  0.043  0.316  1.0
  O  O10  1  0.753  0.906  0.251  1.0
  O  O11  1  0.745  0.018  0.962  1.0
  O  O12  1  0.063  0.639  0.305  1.0
  O  O13  1  0.758  0.376  0.358  1.0
  O  O14  1  0.760  0.957  0.684  1.0
  O  O15  1  0.247  0.094  0.749  1.0
  O  O16  1  0.058  0.803  0.892  1.0
  O  O17  1  0.443  0.634  0.307  1.0
  O  O18  1  0.752  0.637  0.520  1.0
  O  O19  1  0.249  0.356  0.907  1.0
  O  O20  1  0.750  0.588  0.804  1.0
  O  O21  1  0.751  0.644  0.093  1.0
  O  O22  1  0.556  0.195  0.116  1.0
  O  O23  1  0.937  0.361  0.695  1.0
  O  O24  1  0.250  0.412  0.196  1.0
  O  O25  1  0.557  0.366  0.693  1.0
  O  O26  1  0.242  0.624  0.642  1.0
  O  O27  1  0.248  0.363  0.480  1.0
  O  O28  1  0.444  0.805  0.884  1.0
  O  O29  1  0.942  0.197  0.108  1.0
[/CIF]
.
The compound described by (MoO2)2P2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one O(3), one O(4), one O(5), one O(7), one O(8), and one O(9) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(2)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. In the second Mo site, Mo(2) is bonded to one O(1), one O(10), one O(11), one O(2), one O(6), and one O(9) atom to form distorted MoO6 octahedra that share  a cornercorner with one Mo(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with three equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 27°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(11), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Mo(1)O6 octahedra and corners with three equivalent Mo(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-42°. In the second P site, P(2) is bonded to one O(10), one O(4), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Mo(2)O6 octahedra and corners with three equivalent Mo(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-50°. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Mo(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Mo(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Mo(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Mo(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mo(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Mo(2) and one P(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mo2P2O11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.438
_cell_length_b   7.607
_cell_length_c   9.154
_cell_angle_alpha   74.810
_cell_angle_beta   89.833
_cell_angle_gamma   89.900
_symmetry_Int_Tables_number   1
_cell_volume   432.611
_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
  Mo  Mo0  1  0.247  0.391  0.705  1.0
  Mo  Mo1  1  0.753  0.609  0.295  1.0
  Mo  Mo2  1  0.248  0.184  0.139  1.0
  Mo  Mo3  1  0.752  0.816  0.861  1.0
  P  P4  1  0.749  0.070  0.116  1.0
  P  P5  1  0.749  0.491  0.671  1.0
  P  P6  1  0.251  0.509  0.329  1.0
  P  P7  1  0.251  0.930  0.884  1.0
  O  O8  1  0.255  0.982  0.038  1.0
  O  O9  1  0.240  0.043  0.316  1.0
  O  O10  1  0.753  0.906  0.251  1.0
  O  O11  1  0.745  0.018  0.962  1.0
  O  O12  1  0.063  0.639  0.305  1.0
  O  O13  1  0.758  0.376  0.358  1.0
  O  O14  1  0.760  0.957  0.684  1.0
  O  O15  1  0.247  0.094  0.749  1.0
  O  O16  1  0.058  0.803  0.892  1.0
  O  O17  1  0.443  0.634  0.307  1.0
  O  O18  1  0.752  0.637  0.520  1.0
  O  O19  1  0.249  0.356  0.907  1.0
  O  O20  1  0.750  0.588  0.804  1.0
  O  O21  1  0.751  0.644  0.093  1.0
  O  O22  1  0.556  0.195  0.116  1.0
  O  O23  1  0.937  0.361  0.695  1.0
  O  O24  1  0.250  0.412  0.196  1.0
  O  O25  1  0.557  0.366  0.693  1.0
  O  O26  1  0.242  0.624  0.642  1.0
  O  O27  1  0.248  0.363  0.480  1.0
  O  O28  1  0.444  0.805  0.884  1.0
  O  O29  1  0.942  0.197  0.108  1.0
[/CIF]
.