The structure described by Li3Cu2F7 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one F(1), one F(2), one F(3), and one F(5) atom. In the second Li site, Li(2) is bonded to one F(1), one F(2), one F(4), one F(5), and one F(7) atom to form a mixture of distorted edge and corner-sharing LiF5 square pyramids. In the third Li site, Li(3) is bonded to one F(1), one F(2), one F(3), one F(6), and one F(7) atom to form a mixture of edge and corner-sharing LiF5 square pyramids. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one F(1), one F(4), one F(5), one F(7), and two equivalent F(2) atoms. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one F(3), one F(4), one F(5), one F(6), and one F(7) atom. There are seven inequivalent F sites. In the first F site, F(1) is bonded to one Li(1), one Li(2), one Li(3), and one Cu(1) atom to form distorted corner-sharing FLi3Cu tetrahedra. In the second F site, F(2) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), one Li(3), and two equivalent Cu(1) atoms. In the third F site, F(3) is bonded in a trigonal non-coplanar geometry to one Li(1), one Li(3), and one Cu(2) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Li(2), one Cu(1), and one Cu(2) atom. In the fifth F site, F(5) is bonded to one Li(1), one Li(2), one Cu(1), and one Cu(2) atom to form distorted corner-sharing FLi2Cu2 tetrahedra. In the sixth F site, F(6) is bonded in a distorted bent 120 degrees geometry to one Li(3) and one Cu(2) atom. In the seventh F site, F(7) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Cu(1), and one Cu(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Cu2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.639
_cell_length_b   7.089
_cell_length_c   8.937
_cell_angle_alpha   77.395
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   534.091
_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
  Li  Li0  1  0.691  0.936  0.954  1.0
  Li  Li1  1  0.809  0.936  0.454  1.0
  Li  Li2  1  0.167  0.772  0.860  1.0
  Li  Li3  1  0.846  0.711  0.805  1.0
  Li  Li4  1  0.333  0.772  0.360  1.0
  Li  Li5  1  0.654  0.711  0.305  1.0
  Li  Li6  1  0.346  0.289  0.695  1.0
  Li  Li7  1  0.667  0.228  0.640  1.0
  Li  Li8  1  0.154  0.289  0.195  1.0
  Li  Li9  1  0.833  0.228  0.140  1.0
  Li  Li10  1  0.191  0.064  0.546  1.0
  Li  Li11  1  0.309  0.064  0.046  1.0
  Cu  Cu12  1  0.495  0.813  0.659  1.0
  Cu  Cu13  1  0.005  0.813  0.159  1.0
  Cu  Cu14  1  0.073  0.629  0.579  1.0
  Cu  Cu15  1  0.427  0.629  0.079  1.0
  Cu  Cu16  1  0.573  0.371  0.921  1.0
  Cu  Cu17  1  0.927  0.371  0.421  1.0
  Cu  Cu18  1  0.995  0.187  0.841  1.0
  Cu  Cu19  1  0.505  0.187  0.341  1.0
  F  F20  1  0.673  0.929  0.735  1.0
  F  F21  1  0.921  0.846  0.954  1.0
  F  F22  1  0.952  0.840  0.612  1.0
  F  F23  1  0.827  0.929  0.235  1.0
  F  F24  1  0.393  0.741  0.854  1.0
  F  F25  1  0.579  0.846  0.454  1.0
  F  F26  1  0.292  0.800  0.571  1.0
  F  F27  1  0.548  0.840  0.112  1.0
  F  F28  1  0.689  0.586  0.945  1.0
  F  F29  1  0.107  0.741  0.354  1.0
  F  F30  1  0.208  0.800  0.071  1.0
  F  F31  1  0.055  0.547  0.800  1.0
  F  F32  1  0.811  0.586  0.445  1.0
  F  F33  1  0.555  0.453  0.700  1.0
  F  F34  1  0.445  0.547  0.300  1.0
  F  F35  1  0.189  0.414  0.555  1.0
  F  F36  1  0.945  0.453  0.200  1.0
  F  F37  1  0.792  0.200  0.929  1.0
  F  F38  1  0.893  0.259  0.646  1.0
  F  F39  1  0.311  0.414  0.055  1.0
  F  F40  1  0.452  0.160  0.888  1.0
  F  F41  1  0.708  0.200  0.429  1.0
  F  F42  1  0.421  0.154  0.546  1.0
  F  F43  1  0.607  0.259  0.146  1.0
  F  F44  1  0.173  0.071  0.765  1.0
  F  F45  1  0.048  0.160  0.388  1.0
  F  F46  1  0.079  0.154  0.046  1.0
  F  F47  1  0.327  0.071  0.265  1.0
[/CIF]
.
The structure described by Li3Cu2F7 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded in a 4-coordinate geometry to one F(1), one F(2), one F(3), and one F(5) atom. In the second Li site, Li(2) is bonded to one F(1), one F(2), one F(4), one F(5), and one F(7) atom to form a mixture of distorted edge and corner-sharing LiF5 square pyramids. In the third Li site, Li(3) is bonded to one F(1), one F(2), one F(3), one F(6), and one F(7) atom to form a mixture of edge and corner-sharing LiF5 square pyramids. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one F(1), one F(4), one F(5), one F(7), and two equivalent F(2) atoms. In the second Cu site, Cu(2) is bonded in a 5-coordinate geometry to one F(3), one F(4), one F(5), one F(6), and one F(7) atom. There are seven inequivalent F sites. In the first F site, F(1) is bonded to one Li(1), one Li(2), one Li(3), and one Cu(1) atom to form distorted corner-sharing FLi3Cu tetrahedra. In the second F site, F(2) is bonded in a 5-coordinate geometry to one Li(1), one Li(2), one Li(3), and two equivalent Cu(1) atoms. In the third F site, F(3) is bonded in a trigonal non-coplanar geometry to one Li(1), one Li(3), and one Cu(2) atom. In the fourth F site, F(4) is bonded in a distorted trigonal planar geometry to one Li(2), one Cu(1), and one Cu(2) atom. In the fifth F site, F(5) is bonded to one Li(1), one Li(2), one Cu(1), and one Cu(2) atom to form distorted corner-sharing FLi2Cu2 tetrahedra. In the sixth F site, F(6) is bonded in a distorted bent 120 degrees geometry to one Li(3) and one Cu(2) atom. In the seventh F site, F(7) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Cu(1), and one Cu(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li3Cu2F7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.639
_cell_length_b   7.089
_cell_length_c   8.937
_cell_angle_alpha   77.395
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   534.091
_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
  Li  Li0  1  0.691  0.936  0.954  1.0
  Li  Li1  1  0.809  0.936  0.454  1.0
  Li  Li2  1  0.167  0.772  0.860  1.0
  Li  Li3  1  0.846  0.711  0.805  1.0
  Li  Li4  1  0.333  0.772  0.360  1.0
  Li  Li5  1  0.654  0.711  0.305  1.0
  Li  Li6  1  0.346  0.289  0.695  1.0
  Li  Li7  1  0.667  0.228  0.640  1.0
  Li  Li8  1  0.154  0.289  0.195  1.0
  Li  Li9  1  0.833  0.228  0.140  1.0
  Li  Li10  1  0.191  0.064  0.546  1.0
  Li  Li11  1  0.309  0.064  0.046  1.0
  Cu  Cu12  1  0.495  0.813  0.659  1.0
  Cu  Cu13  1  0.005  0.813  0.159  1.0
  Cu  Cu14  1  0.073  0.629  0.579  1.0
  Cu  Cu15  1  0.427  0.629  0.079  1.0
  Cu  Cu16  1  0.573  0.371  0.921  1.0
  Cu  Cu17  1  0.927  0.371  0.421  1.0
  Cu  Cu18  1  0.995  0.187  0.841  1.0
  Cu  Cu19  1  0.505  0.187  0.341  1.0
  F  F20  1  0.673  0.929  0.735  1.0
  F  F21  1  0.921  0.846  0.954  1.0
  F  F22  1  0.952  0.840  0.612  1.0
  F  F23  1  0.827  0.929  0.235  1.0
  F  F24  1  0.393  0.741  0.854  1.0
  F  F25  1  0.579  0.846  0.454  1.0
  F  F26  1  0.292  0.800  0.571  1.0
  F  F27  1  0.548  0.840  0.112  1.0
  F  F28  1  0.689  0.586  0.945  1.0
  F  F29  1  0.107  0.741  0.354  1.0
  F  F30  1  0.208  0.800  0.071  1.0
  F  F31  1  0.055  0.547  0.800  1.0
  F  F32  1  0.811  0.586  0.445  1.0
  F  F33  1  0.555  0.453  0.700  1.0
  F  F34  1  0.445  0.547  0.300  1.0
  F  F35  1  0.189  0.414  0.555  1.0
  F  F36  1  0.945  0.453  0.200  1.0
  F  F37  1  0.792  0.200  0.929  1.0
  F  F38  1  0.893  0.259  0.646  1.0
  F  F39  1  0.311  0.414  0.055  1.0
  F  F40  1  0.452  0.160  0.888  1.0
  F  F41  1  0.708  0.200  0.429  1.0
  F  F42  1  0.421  0.154  0.546  1.0
  F  F43  1  0.607  0.259  0.146  1.0
  F  F44  1  0.173  0.071  0.765  1.0
  F  F45  1  0.048  0.160  0.388  1.0
  F  F46  1  0.079  0.154  0.046  1.0
  F  F47  1  0.327  0.071  0.265  1.0
[/CIF]
.