The structure described by (FeP2O7)2N2 crystallizes in the monoclinic P2_1/c space group. The structure consists of four ammonia atoms inside a FeP2O7 framework. In the FeP2O7 framework, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-45°. In the second P site, P(2) 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 three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-42°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the second O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(7) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a linear geometry to one Fe(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeP2NO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.781
_cell_length_b   8.421
_cell_length_c   10.025
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   104.522
_symmetry_Int_Tables_number   1
_cell_volume   635.959
_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
  Fe  Fe0  1  0.761  0.740  0.085  1.0
  Fe  Fe1  1  0.239  0.760  0.585  1.0
  Fe  Fe2  1  0.239  0.260  0.915  1.0
  Fe  Fe3  1  0.761  0.240  0.415  1.0
  P  P4  1  0.574  0.320  0.135  1.0
  P  P5  1  0.426  0.180  0.635  1.0
  P  P6  1  0.426  0.680  0.865  1.0
  P  P7  1  0.574  0.820  0.365  1.0
  P  P8  1  0.869  0.165  0.106  1.0
  P  P9  1  0.131  0.335  0.606  1.0
  P  P10  1  0.131  0.835  0.894  1.0
  P  P11  1  0.869  0.665  0.394  1.0
  N  N12  1  0.799  0.979  0.695  1.0
  N  N13  1  0.201  0.521  0.195  1.0
  N  N14  1  0.201  0.021  0.305  1.0
  N  N15  1  0.799  0.479  0.805  1.0
  O  O16  1  0.690  0.212  0.059  1.0
  O  O17  1  0.310  0.288  0.559  1.0
  O  O18  1  0.310  0.788  0.941  1.0
  O  O19  1  0.690  0.712  0.441  1.0
  O  O20  1  0.613  0.737  0.920  1.0
  O  O21  1  0.387  0.763  0.420  1.0
  O  O22  1  0.387  0.263  0.080  1.0
  O  O23  1  0.613  0.237  0.580  1.0
  O  O24  1  0.902  0.710  0.247  1.0
  O  O25  1  0.098  0.790  0.747  1.0
  O  O26  1  0.098  0.290  0.753  1.0
  O  O27  1  0.902  0.210  0.253  1.0
  O  O28  1  0.838  0.983  0.078  1.0
  O  O29  1  0.162  0.517  0.578  1.0
  O  O30  1  0.162  0.017  0.922  1.0
  O  O31  1  0.838  0.483  0.422  1.0
  O  O32  1  0.978  0.734  0.977  1.0
  O  O33  1  0.022  0.766  0.477  1.0
  O  O34  1  0.022  0.266  0.023  1.0
  O  O35  1  0.978  0.234  0.523  1.0
  O  O36  1  0.576  0.784  0.215  1.0
  O  O37  1  0.424  0.716  0.715  1.0
  O  O38  1  0.424  0.216  0.785  1.0
  O  O39  1  0.576  0.284  0.285  1.0
  O  O40  1  0.660  0.499  0.102  1.0
  O  O41  1  0.340  0.001  0.602  1.0
  O  O42  1  0.340  0.501  0.898  1.0
  O  O43  1  0.660  0.999  0.398  1.0
[/CIF]
.
The structure described by (FeP2O7)2N2 crystallizes in the monoclinic P2_1/c space group. The structure consists of four ammonia atoms inside a FeP2O7 framework. In the FeP2O7 framework, Fe(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form FeO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 8-45°. In the second P site, P(2) 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 three equivalent Fe(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 15-42°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the second O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(7) is bonded in a linear geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a linear geometry to one Fe(1) and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_FeP2NO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.781
_cell_length_b   8.421
_cell_length_c   10.025
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   104.522
_symmetry_Int_Tables_number   1
_cell_volume   635.959
_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
  Fe  Fe0  1  0.761  0.740  0.085  1.0
  Fe  Fe1  1  0.239  0.760  0.585  1.0
  Fe  Fe2  1  0.239  0.260  0.915  1.0
  Fe  Fe3  1  0.761  0.240  0.415  1.0
  P  P4  1  0.574  0.320  0.135  1.0
  P  P5  1  0.426  0.180  0.635  1.0
  P  P6  1  0.426  0.680  0.865  1.0
  P  P7  1  0.574  0.820  0.365  1.0
  P  P8  1  0.869  0.165  0.106  1.0
  P  P9  1  0.131  0.335  0.606  1.0
  P  P10  1  0.131  0.835  0.894  1.0
  P  P11  1  0.869  0.665  0.394  1.0
  N  N12  1  0.799  0.979  0.695  1.0
  N  N13  1  0.201  0.521  0.195  1.0
  N  N14  1  0.201  0.021  0.305  1.0
  N  N15  1  0.799  0.479  0.805  1.0
  O  O16  1  0.690  0.212  0.059  1.0
  O  O17  1  0.310  0.288  0.559  1.0
  O  O18  1  0.310  0.788  0.941  1.0
  O  O19  1  0.690  0.712  0.441  1.0
  O  O20  1  0.613  0.737  0.920  1.0
  O  O21  1  0.387  0.763  0.420  1.0
  O  O22  1  0.387  0.263  0.080  1.0
  O  O23  1  0.613  0.237  0.580  1.0
  O  O24  1  0.902  0.710  0.247  1.0
  O  O25  1  0.098  0.790  0.747  1.0
  O  O26  1  0.098  0.290  0.753  1.0
  O  O27  1  0.902  0.210  0.253  1.0
  O  O28  1  0.838  0.983  0.078  1.0
  O  O29  1  0.162  0.517  0.578  1.0
  O  O30  1  0.162  0.017  0.922  1.0
  O  O31  1  0.838  0.483  0.422  1.0
  O  O32  1  0.978  0.734  0.977  1.0
  O  O33  1  0.022  0.766  0.477  1.0
  O  O34  1  0.022  0.266  0.023  1.0
  O  O35  1  0.978  0.234  0.523  1.0
  O  O36  1  0.576  0.784  0.215  1.0
  O  O37  1  0.424  0.716  0.715  1.0
  O  O38  1  0.424  0.216  0.785  1.0
  O  O39  1  0.576  0.284  0.285  1.0
  O  O40  1  0.660  0.499  0.102  1.0
  O  O41  1  0.340  0.001  0.602  1.0
  O  O42  1  0.340  0.501  0.898  1.0
  O  O43  1  0.660  0.999  0.398  1.0
[/CIF]
.