The compound described by MnP2O7 crystallizes in the monoclinic P2_1/c space group. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-45°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one Mn(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF file [CIF]
data_MnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.214
_cell_length_b   5.050
_cell_length_c   13.420
_cell_angle_alpha   75.668
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.351
_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
  Mn  Mn0  1  0.843  0.661  0.127  1.0
  Mn  Mn1  1  0.343  0.339  0.373  1.0
  Mn  Mn2  1  0.657  0.661  0.627  1.0
  Mn  Mn3  1  0.157  0.339  0.873  1.0
  P  P4  1  0.698  0.263  0.475  1.0
  P  P5  1  0.453  0.546  0.192  1.0
  P  P6  1  0.953  0.454  0.308  1.0
  P  P7  1  0.198  0.737  0.025  1.0
  P  P8  1  0.802  0.263  0.975  1.0
  P  P9  1  0.047  0.546  0.692  1.0
  P  P10  1  0.547  0.454  0.808  1.0
  P  P11  1  0.302  0.737  0.525  1.0
  O  O12  1  0.569  0.323  0.716  1.0
  O  O13  1  0.867  0.732  0.264  1.0
  O  O14  1  0.326  0.463  0.498  1.0
  O  O15  1  0.127  0.482  0.341  1.0
  O  O16  1  0.061  0.793  0.095  1.0
  O  O17  1  0.236  0.975  0.933  1.0
  O  O18  1  0.864  0.283  0.409  1.0
  O  O19  1  0.364  0.717  0.091  1.0
  O  O20  1  0.561  0.207  0.405  1.0
  O  O21  1  0.627  0.518  0.159  1.0
  O  O22  1  0.736  0.025  0.567  1.0
  O  O23  1  0.367  0.268  0.236  1.0
  O  O24  1  0.826  0.537  0.002  1.0
  O  O25  1  0.069  0.677  0.784  1.0
  O  O26  1  0.931  0.323  0.216  1.0
  O  O27  1  0.174  0.463  0.998  1.0
  O  O28  1  0.633  0.732  0.764  1.0
  O  O29  1  0.264  0.975  0.433  1.0
  O  O30  1  0.373  0.482  0.841  1.0
  O  O31  1  0.439  0.793  0.595  1.0
  O  O32  1  0.636  0.283  0.909  1.0
  O  O33  1  0.136  0.717  0.591  1.0
  O  O34  1  0.764  0.025  0.067  1.0
  O  O35  1  0.939  0.207  0.905  1.0
  O  O36  1  0.873  0.518  0.659  1.0
  O  O37  1  0.674  0.537  0.502  1.0
  O  O38  1  0.133  0.268  0.736  1.0
  O  O39  1  0.431  0.677  0.284  1.0
[/CIF]
.
The compound described by MnP2O7 crystallizes in the monoclinic P2_1/c space group. Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MnO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-45°. In the second P site, P(2) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in an L-shaped geometry to one Mn(1) and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. is represented by the CIF file [CIF]
data_MnP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.214
_cell_length_b   5.050
_cell_length_c   13.420
_cell_angle_alpha   75.668
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   539.351
_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
  Mn  Mn0  1  0.843  0.661  0.127  1.0
  Mn  Mn1  1  0.343  0.339  0.373  1.0
  Mn  Mn2  1  0.657  0.661  0.627  1.0
  Mn  Mn3  1  0.157  0.339  0.873  1.0
  P  P4  1  0.698  0.263  0.475  1.0
  P  P5  1  0.453  0.546  0.192  1.0
  P  P6  1  0.953  0.454  0.308  1.0
  P  P7  1  0.198  0.737  0.025  1.0
  P  P8  1  0.802  0.263  0.975  1.0
  P  P9  1  0.047  0.546  0.692  1.0
  P  P10  1  0.547  0.454  0.808  1.0
  P  P11  1  0.302  0.737  0.525  1.0
  O  O12  1  0.569  0.323  0.716  1.0
  O  O13  1  0.867  0.732  0.264  1.0
  O  O14  1  0.326  0.463  0.498  1.0
  O  O15  1  0.127  0.482  0.341  1.0
  O  O16  1  0.061  0.793  0.095  1.0
  O  O17  1  0.236  0.975  0.933  1.0
  O  O18  1  0.864  0.283  0.409  1.0
  O  O19  1  0.364  0.717  0.091  1.0
  O  O20  1  0.561  0.207  0.405  1.0
  O  O21  1  0.627  0.518  0.159  1.0
  O  O22  1  0.736  0.025  0.567  1.0
  O  O23  1  0.367  0.268  0.236  1.0
  O  O24  1  0.826  0.537  0.002  1.0
  O  O25  1  0.069  0.677  0.784  1.0
  O  O26  1  0.931  0.323  0.216  1.0
  O  O27  1  0.174  0.463  0.998  1.0
  O  O28  1  0.633  0.732  0.764  1.0
  O  O29  1  0.264  0.975  0.433  1.0
  O  O30  1  0.373  0.482  0.841  1.0
  O  O31  1  0.439  0.793  0.595  1.0
  O  O32  1  0.636  0.283  0.909  1.0
  O  O33  1  0.136  0.717  0.591  1.0
  O  O34  1  0.764  0.025  0.067  1.0
  O  O35  1  0.939  0.207  0.905  1.0
  O  O36  1  0.873  0.518  0.659  1.0
  O  O37  1  0.674  0.537  0.502  1.0
  O  O38  1  0.133  0.268  0.736  1.0
  O  O39  1  0.431  0.677  0.284  1.0
[/CIF]
.