The compound described by CrP2O7 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-43°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the fourth O site, O(4) is bonded in an L-shaped geometry to one Cr(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in an L-shaped geometry to one Cr(1) and one P(1) atom. is represented by the CIF card [CIF]
data_CrP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.207
_cell_length_b   5.117
_cell_length_c   13.683
_cell_angle_alpha   73.537
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   551.048
_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
  Cr  Cr0  1  0.652  0.143  0.633  1.0
  Cr  Cr1  1  0.348  0.857  0.367  1.0
  Cr  Cr2  1  0.848  0.143  0.133  1.0
  Cr  Cr3  1  0.152  0.857  0.867  1.0
  P  P4  1  0.045  0.048  0.686  1.0
  P  P5  1  0.455  0.048  0.186  1.0
  P  P6  1  0.545  0.952  0.814  1.0
  P  P7  1  0.955  0.952  0.314  1.0
  P  P8  1  0.699  0.765  0.479  1.0
  P  P9  1  0.801  0.765  0.979  1.0
  P  P10  1  0.301  0.235  0.521  1.0
  P  P11  1  0.199  0.235  0.021  1.0
  O  O12  1  0.829  0.028  0.010  1.0
  O  O13  1  0.872  0.800  0.419  1.0
  O  O14  1  0.372  0.200  0.081  1.0
  O  O15  1  0.369  0.992  0.840  1.0
  O  O16  1  0.128  0.200  0.581  1.0
  O  O17  1  0.632  0.227  0.762  1.0
  O  O18  1  0.230  0.486  0.933  1.0
  O  O19  1  0.131  0.992  0.340  1.0
  O  O20  1  0.171  0.972  0.990  1.0
  O  O21  1  0.568  0.731  0.404  1.0
  O  O22  1  0.935  0.806  0.230  1.0
  O  O23  1  0.868  0.227  0.262  1.0
  O  O24  1  0.368  0.773  0.238  1.0
  O  O25  1  0.435  0.194  0.270  1.0
  O  O26  1  0.270  0.486  0.433  1.0
  O  O27  1  0.628  0.800  0.919  1.0
  O  O28  1  0.770  0.514  0.067  1.0
  O  O29  1  0.932  0.731  0.904  1.0
  O  O30  1  0.068  0.269  0.096  1.0
  O  O31  1  0.671  0.028  0.510  1.0
  O  O32  1  0.565  0.806  0.730  1.0
  O  O33  1  0.730  0.514  0.567  1.0
  O  O34  1  0.065  0.194  0.770  1.0
  O  O35  1  0.631  0.008  0.160  1.0
  O  O36  1  0.329  0.972  0.490  1.0
  O  O37  1  0.432  0.269  0.596  1.0
  O  O38  1  0.132  0.773  0.738  1.0
  O  O39  1  0.869  0.008  0.660  1.0
[/CIF]
.
The compound described by CrP2O7 crystallizes in the monoclinic P2_1/c space group. Cr(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CrO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(1)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 30°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with three equivalent Cr(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 37-43°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(1) atom. In the fourth O site, O(4) is bonded in an L-shaped geometry to one Cr(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Cr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in an L-shaped geometry to one Cr(1) and one P(1) atom. is represented by the CIF card [CIF]
data_CrP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.207
_cell_length_b   5.117
_cell_length_c   13.683
_cell_angle_alpha   73.537
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   551.048
_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
  Cr  Cr0  1  0.652  0.143  0.633  1.0
  Cr  Cr1  1  0.348  0.857  0.367  1.0
  Cr  Cr2  1  0.848  0.143  0.133  1.0
  Cr  Cr3  1  0.152  0.857  0.867  1.0
  P  P4  1  0.045  0.048  0.686  1.0
  P  P5  1  0.455  0.048  0.186  1.0
  P  P6  1  0.545  0.952  0.814  1.0
  P  P7  1  0.955  0.952  0.314  1.0
  P  P8  1  0.699  0.765  0.479  1.0
  P  P9  1  0.801  0.765  0.979  1.0
  P  P10  1  0.301  0.235  0.521  1.0
  P  P11  1  0.199  0.235  0.021  1.0
  O  O12  1  0.829  0.028  0.010  1.0
  O  O13  1  0.872  0.800  0.419  1.0
  O  O14  1  0.372  0.200  0.081  1.0
  O  O15  1  0.369  0.992  0.840  1.0
  O  O16  1  0.128  0.200  0.581  1.0
  O  O17  1  0.632  0.227  0.762  1.0
  O  O18  1  0.230  0.486  0.933  1.0
  O  O19  1  0.131  0.992  0.340  1.0
  O  O20  1  0.171  0.972  0.990  1.0
  O  O21  1  0.568  0.731  0.404  1.0
  O  O22  1  0.935  0.806  0.230  1.0
  O  O23  1  0.868  0.227  0.262  1.0
  O  O24  1  0.368  0.773  0.238  1.0
  O  O25  1  0.435  0.194  0.270  1.0
  O  O26  1  0.270  0.486  0.433  1.0
  O  O27  1  0.628  0.800  0.919  1.0
  O  O28  1  0.770  0.514  0.067  1.0
  O  O29  1  0.932  0.731  0.904  1.0
  O  O30  1  0.068  0.269  0.096  1.0
  O  O31  1  0.671  0.028  0.510  1.0
  O  O32  1  0.565  0.806  0.730  1.0
  O  O33  1  0.730  0.514  0.567  1.0
  O  O34  1  0.065  0.194  0.770  1.0
  O  O35  1  0.631  0.008  0.160  1.0
  O  O36  1  0.329  0.972  0.490  1.0
  O  O37  1  0.432  0.269  0.596  1.0
  O  O38  1  0.132  0.773  0.738  1.0
  O  O39  1  0.869  0.008  0.660  1.0
[/CIF]
.