The compound described by CoP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(14), one O(2), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with three equivalent P(4)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(13), one O(3), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with three equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(14), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-49°. In the second P site, P(2) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-47°. In the third P site, P(3) is bonded to one O(13), one O(3), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with three equivalent Co(2)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-47°. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(2), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-46°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one P(4) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Co(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Co(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Co(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(1) atom. is represented by the CIF file [CIF]
data_CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.426
_cell_length_b   6.337
_cell_length_c   13.326
_cell_angle_alpha   78.431
_cell_angle_beta   77.461
_cell_angle_gamma   99.138
_symmetry_Int_Tables_number   1
_cell_volume   507.230
_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
  Co  Co0  1  0.737  0.875  0.851  1.0
  Co  Co1  1  0.773  0.408  0.354  1.0
  Co  Co2  1  0.227  0.592  0.646  1.0
  Co  Co3  1  0.263  0.125  0.149  1.0
  P  P4  1  0.222  0.743  0.865  1.0
  P  P5  1  0.778  0.257  0.135  1.0
  P  P6  1  0.893  0.914  0.364  1.0
  P  P7  1  0.763  0.587  0.568  1.0
  P  P8  1  0.346  0.670  0.067  1.0
  P  P9  1  0.237  0.413  0.432  1.0
  P  P10  1  0.107  0.086  0.636  1.0
  P  P11  1  0.654  0.330  0.933  1.0
  O  O12  1  0.786  0.392  0.018  1.0
  O  O13  1  0.764  0.175  0.879  1.0
  O  O14  1  0.904  0.529  0.644  1.0
  O  O15  1  0.870  0.986  0.702  1.0
  O  O16  1  0.236  0.825  0.121  1.0
  O  O17  1  0.096  0.471  0.356  1.0
  O  O18  1  0.130  0.014  0.298  1.0
  O  O19  1  0.033  0.861  0.875  1.0
  O  O20  1  0.091  0.193  0.519  1.0
  O  O21  1  0.331  0.451  0.144  1.0
  O  O22  1  0.236  0.904  0.626  1.0
  O  O23  1  0.283  0.594  0.490  1.0
  O  O24  1  0.187  0.568  0.802  1.0
  O  O25  1  0.584  0.775  0.004  1.0
  O  O26  1  0.218  0.274  0.675  1.0
  O  O27  1  0.214  0.608  0.982  1.0
  O  O28  1  0.446  0.357  0.377  1.0
  O  O29  1  0.909  0.807  0.481  1.0
  O  O30  1  0.446  0.897  0.820  1.0
  O  O31  1  0.554  0.643  0.623  1.0
  O  O32  1  0.967  0.139  0.125  1.0
  O  O33  1  0.782  0.726  0.325  1.0
  O  O34  1  0.416  0.225  0.996  1.0
  O  O35  1  0.813  0.432  0.198  1.0
  O  O36  1  0.717  0.406  0.510  1.0
  O  O37  1  0.764  0.096  0.374  1.0
  O  O38  1  0.669  0.549  0.856  1.0
  O  O39  1  0.554  0.103  0.180  1.0
[/CIF]
.
The compound described by CoP2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to one O(11), one O(14), one O(2), one O(4), one O(5), and one O(7) atom to form CoO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with three equivalent P(4)O4 tetrahedra. In the second Co site, Co(2) is bonded to one O(10), one O(12), one O(13), one O(3), one O(8), and one O(9) atom to form CoO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with three equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(10), one O(14), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Co(2)O6 octahedra, corners with two equivalent Co(1)O6 octahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-49°. In the second P site, P(2) is bonded to one O(12), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with two equivalent Co(2)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-47°. In the third P site, P(3) is bonded to one O(13), one O(3), one O(6), and one O(9) atom to form PO4 tetrahedra that share corners with three equivalent Co(2)O6 octahedra and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-47°. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(2), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Co(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-46°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Co(1) and one P(4) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Co(2) and one P(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Co(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one P(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Co(2) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Co(2) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Co(1) and one P(1) atom. is represented by the CIF file [CIF]
data_CoP2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.426
_cell_length_b   6.337
_cell_length_c   13.326
_cell_angle_alpha   78.431
_cell_angle_beta   77.461
_cell_angle_gamma   99.138
_symmetry_Int_Tables_number   1
_cell_volume   507.230
_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
  Co  Co0  1  0.737  0.875  0.851  1.0
  Co  Co1  1  0.773  0.408  0.354  1.0
  Co  Co2  1  0.227  0.592  0.646  1.0
  Co  Co3  1  0.263  0.125  0.149  1.0
  P  P4  1  0.222  0.743  0.865  1.0
  P  P5  1  0.778  0.257  0.135  1.0
  P  P6  1  0.893  0.914  0.364  1.0
  P  P7  1  0.763  0.587  0.568  1.0
  P  P8  1  0.346  0.670  0.067  1.0
  P  P9  1  0.237  0.413  0.432  1.0
  P  P10  1  0.107  0.086  0.636  1.0
  P  P11  1  0.654  0.330  0.933  1.0
  O  O12  1  0.786  0.392  0.018  1.0
  O  O13  1  0.764  0.175  0.879  1.0
  O  O14  1  0.904  0.529  0.644  1.0
  O  O15  1  0.870  0.986  0.702  1.0
  O  O16  1  0.236  0.825  0.121  1.0
  O  O17  1  0.096  0.471  0.356  1.0
  O  O18  1  0.130  0.014  0.298  1.0
  O  O19  1  0.033  0.861  0.875  1.0
  O  O20  1  0.091  0.193  0.519  1.0
  O  O21  1  0.331  0.451  0.144  1.0
  O  O22  1  0.236  0.904  0.626  1.0
  O  O23  1  0.283  0.594  0.490  1.0
  O  O24  1  0.187  0.568  0.802  1.0
  O  O25  1  0.584  0.775  0.004  1.0
  O  O26  1  0.218  0.274  0.675  1.0
  O  O27  1  0.214  0.608  0.982  1.0
  O  O28  1  0.446  0.357  0.377  1.0
  O  O29  1  0.909  0.807  0.481  1.0
  O  O30  1  0.446  0.897  0.820  1.0
  O  O31  1  0.554  0.643  0.623  1.0
  O  O32  1  0.967  0.139  0.125  1.0
  O  O33  1  0.782  0.726  0.325  1.0
  O  O34  1  0.416  0.225  0.996  1.0
  O  O35  1  0.813  0.432  0.198  1.0
  O  O36  1  0.717  0.406  0.510  1.0
  O  O37  1  0.764  0.096  0.374  1.0
  O  O38  1  0.669  0.549  0.856  1.0
  O  O39  1  0.554  0.103  0.180  1.0
[/CIF]
.