The structure described by K2Cu(PO3)4 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(5), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(12), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(12), one O(4), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(11), one O(12), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. In the third P site, P(3) is bonded to one O(10), one O(11), one O(8), and one O(9) atom to form corner-sharing PO4 tetrahedra. In the fourth P site, P(4) is bonded to one O(1), one O(10), one O(2), and one O(3) atom to form corner-sharing PO4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one P(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(2), one P(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one K(1), one K(2), and one P(3) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one P(2), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one K(2), one Cu(1), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cu(PO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.259
_cell_length_b   8.259
_cell_length_c   8.278
_cell_angle_alpha   84.069
_cell_angle_beta   84.069
_cell_angle_gamma   97.049
_symmetry_Int_Tables_number   1
_cell_volume   553.479
_cell_formula_units_Z   2
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
  K  K0  1  0.798  0.540  0.900  1.0
  K  K1  1  0.540  0.798  0.400  1.0
  K  K2  1  0.501  0.226  0.610  1.0
  K  K3  1  0.226  0.501  0.110  1.0
  Cu  Cu4  1  0.875  0.187  0.254  1.0
  Cu  Cu5  1  0.187  0.875  0.754  1.0
  P  P6  1  0.225  0.075  0.308  1.0
  P  P7  1  0.075  0.225  0.808  1.0
  P  P8  1  0.537  0.162  0.084  1.0
  P  P9  1  0.162  0.537  0.584  1.0
  P  P10  1  0.533  0.854  0.919  1.0
  P  P11  1  0.854  0.533  0.419  1.0
  P  P12  1  0.841  0.985  0.679  1.0
  P  P13  1  0.985  0.841  0.179  1.0
  O  O14  1  0.976  0.877  0.663  1.0
  O  O15  1  0.877  0.976  0.163  1.0
  O  O16  1  0.743  0.014  0.540  1.0
  O  O17  1  0.014  0.743  0.040  1.0
  O  O18  1  0.162  0.912  0.227  1.0
  O  O19  1  0.912  0.162  0.727  1.0
  O  O20  1  0.088  0.178  0.334  1.0
  O  O21  1  0.178  0.088  0.834  1.0
  O  O22  1  0.317  0.025  0.446  1.0
  O  O23  1  0.025  0.317  0.946  1.0
  O  O24  1  0.351  0.180  0.158  1.0
  O  O25  1  0.180  0.351  0.658  1.0
  O  O26  1  0.575  0.264  0.922  1.0
  O  O27  1  0.264  0.575  0.422  1.0
  O  O28  1  0.681  0.516  0.499  1.0
  O  O29  1  0.516  0.681  0.999  1.0
  O  O30  1  0.903  0.426  0.290  1.0
  O  O31  1  0.426  0.903  0.790  1.0
  O  O32  1  0.904  0.723  0.343  1.0
  O  O33  1  0.723  0.904  0.843  1.0
  O  O34  1  0.967  0.521  0.568  1.0
  O  O35  1  0.521  0.967  0.068  1.0
  O  O36  1  0.193  0.644  0.719  1.0
  O  O37  1  0.644  0.193  0.219  1.0
[/CIF]
.
The structure described by K2Cu(PO3)4 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 5-coordinate geometry to one O(11), one O(2), one O(5), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 8-coordinate geometry to one O(12), one O(2), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Cu(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(12), one O(4), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(11), one O(12), one O(6), and one O(7) atom to form corner-sharing PO4 tetrahedra. In the third P site, P(3) is bonded to one O(10), one O(11), one O(8), and one O(9) atom to form corner-sharing PO4 tetrahedra. In the fourth P site, P(4) is bonded to one O(1), one O(10), one O(2), and one O(3) atom to form corner-sharing PO4 tetrahedra. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Cu(1) and one P(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(4) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one P(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(2), one P(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one K(1), one K(2), and one P(3) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one K(2), one Cu(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(3) and one P(4) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one P(2), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one K(2), one Cu(1), and one P(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Cu(PO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.259
_cell_length_b   8.259
_cell_length_c   8.278
_cell_angle_alpha   84.069
_cell_angle_beta   84.069
_cell_angle_gamma   97.049
_symmetry_Int_Tables_number   1
_cell_volume   553.479
_cell_formula_units_Z   2
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
  K  K0  1  0.798  0.540  0.900  1.0
  K  K1  1  0.540  0.798  0.400  1.0
  K  K2  1  0.501  0.226  0.610  1.0
  K  K3  1  0.226  0.501  0.110  1.0
  Cu  Cu4  1  0.875  0.187  0.254  1.0
  Cu  Cu5  1  0.187  0.875  0.754  1.0
  P  P6  1  0.225  0.075  0.308  1.0
  P  P7  1  0.075  0.225  0.808  1.0
  P  P8  1  0.537  0.162  0.084  1.0
  P  P9  1  0.162  0.537  0.584  1.0
  P  P10  1  0.533  0.854  0.919  1.0
  P  P11  1  0.854  0.533  0.419  1.0
  P  P12  1  0.841  0.985  0.679  1.0
  P  P13  1  0.985  0.841  0.179  1.0
  O  O14  1  0.976  0.877  0.663  1.0
  O  O15  1  0.877  0.976  0.163  1.0
  O  O16  1  0.743  0.014  0.540  1.0
  O  O17  1  0.014  0.743  0.040  1.0
  O  O18  1  0.162  0.912  0.227  1.0
  O  O19  1  0.912  0.162  0.727  1.0
  O  O20  1  0.088  0.178  0.334  1.0
  O  O21  1  0.178  0.088  0.834  1.0
  O  O22  1  0.317  0.025  0.446  1.0
  O  O23  1  0.025  0.317  0.946  1.0
  O  O24  1  0.351  0.180  0.158  1.0
  O  O25  1  0.180  0.351  0.658  1.0
  O  O26  1  0.575  0.264  0.922  1.0
  O  O27  1  0.264  0.575  0.422  1.0
  O  O28  1  0.681  0.516  0.499  1.0
  O  O29  1  0.516  0.681  0.999  1.0
  O  O30  1  0.903  0.426  0.290  1.0
  O  O31  1  0.426  0.903  0.790  1.0
  O  O32  1  0.904  0.723  0.343  1.0
  O  O33  1  0.723  0.904  0.843  1.0
  O  O34  1  0.967  0.521  0.568  1.0
  O  O35  1  0.521  0.967  0.068  1.0
  O  O36  1  0.193  0.644  0.719  1.0
  O  O37  1  0.644  0.193  0.219  1.0
[/CIF]
.