The structure described by K2PH4O5 crystallizes in the monoclinic Cc space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one H(2), one H(4), one O(1), one O(2), one O(5), one O(7), one O(8), and one O(9) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. In the third K site, K(3) is bonded in a 2-coordinate geometry to one O(1) and one O(4) atom. In the fourth K site, K(4) is bonded in a 10-coordinate geometry to one H(3), one H(5), one H(8), one O(1), one O(10), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second P site, P(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(7) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one K(4), one O(3), and one O(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one O(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one K(4) and one O(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one K(4) and one O(10) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), one K(4), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(4), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one P(1), one H(1), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(2), one K(3), one K(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one P(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one K(1), one K(2), one K(4), one H(1), and one H(2) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one K(1), one K(2), one K(4), one H(3), and one H(4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one K(1), one K(2), one H(5), and one H(6) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one K(2), one K(4), one H(7), and one H(8) atom. is represented by the CIF file [CIF]
data_K2PH4O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.459
_cell_length_b   7.459
_cell_length_c   11.905
_cell_angle_alpha   91.566
_cell_angle_beta   91.566
_cell_angle_gamma   113.001
_symmetry_Int_Tables_number   1
_cell_volume   608.922
_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
  K  K0  1  0.005  0.066  0.757  1.0
  K  K1  1  0.066  0.005  0.257  1.0
  K  K2  1  0.414  0.190  0.012  1.0
  K  K3  1  0.190  0.414  0.512  1.0
  K  K4  1  0.412  0.662  0.187  1.0
  K  K5  1  0.662  0.412  0.687  1.0
  K  K6  1  0.863  0.479  0.220  1.0
  K  K7  1  0.479  0.863  0.720  1.0
  P  P8  1  0.065  0.726  0.967  1.0
  P  P9  1  0.726  0.065  0.467  1.0
  P  P10  1  0.773  0.736  0.971  1.0
  P  P11  1  0.736  0.773  0.471  1.0
  H  H12  1  0.825  0.314  0.897  1.0
  H  H13  1  0.314  0.825  0.397  1.0
  H  H14  1  0.746  0.092  0.923  1.0
  H  H15  1  0.092  0.746  0.423  1.0
  H  H16  1  0.382  0.086  0.538  1.0
  H  H17  1  0.086  0.382  0.038  1.0
  H  H18  1  0.162  0.006  0.563  1.0
  H  H19  1  0.006  0.162  0.063  1.0
  H  H20  1  0.449  0.519  0.845  1.0
  H  H21  1  0.519  0.449  0.345  1.0
  H  H22  1  0.225  0.463  0.865  1.0
  H  H23  1  0.463  0.225  0.365  1.0
  H  H24  1  0.695  0.023  0.118  1.0
  H  H25  1  0.023  0.695  0.618  1.0
  H  H26  1  0.686  0.088  0.246  1.0
  H  H27  1  0.088  0.686  0.746  1.0
  O  O28  1  0.155  0.793  0.087  1.0
  O  O29  1  0.793  0.155  0.587  1.0
  O  O30  1  0.176  0.860  0.873  1.0
  O  O31  1  0.860  0.176  0.373  1.0
  O  O32  1  0.036  0.510  0.939  1.0
  O  O33  1  0.510  0.036  0.439  1.0
  O  O34  1  0.656  0.583  0.053  1.0
  O  O35  1  0.583  0.656  0.553  1.0
  O  O36  1  0.685  0.702  0.850  1.0
  O  O37  1  0.702  0.685  0.350  1.0
  O  O38  1  0.812  0.950  0.015  1.0
  O  O39  1  0.950  0.812  0.515  1.0
  O  O40  1  0.720  0.185  0.873  1.0
  O  O41  1  0.185  0.720  0.373  1.0
  O  O42  1  0.290  0.104  0.593  1.0
  O  O43  1  0.104  0.290  0.093  1.0
  O  O44  1  0.317  0.415  0.828  1.0
  O  O45  1  0.415  0.317  0.328  1.0
  O  O46  1  0.621  0.073  0.170  1.0
  O  O47  1  0.073  0.621  0.670  1.0
[/CIF]
.
The structure described by K2PH4O5 crystallizes in the monoclinic Cc space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one H(2), one H(4), one O(1), one O(2), one O(5), one O(7), one O(8), and one O(9) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(2), one O(4), one O(7), one O(8), and one O(9) atom. In the third K site, K(3) is bonded in a 2-coordinate geometry to one O(1) and one O(4) atom. In the fourth K site, K(4) is bonded in a 10-coordinate geometry to one H(3), one H(5), one H(8), one O(1), one O(10), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second P site, P(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(7) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one K(4), one O(3), and one O(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one K(1) and one O(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one K(4) and one O(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one K(4) and one O(10) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(3), one K(4), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), one K(4), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one P(1), one H(1), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one K(2), one K(3), one K(4), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one P(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one K(1), one K(2), one K(4), one H(1), and one H(2) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one K(1), one K(2), one K(4), one H(3), and one H(4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one K(1), one K(2), one H(5), and one H(6) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one K(2), one K(4), one H(7), and one H(8) atom. is represented by the CIF file [CIF]
data_K2PH4O5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.459
_cell_length_b   7.459
_cell_length_c   11.905
_cell_angle_alpha   91.566
_cell_angle_beta   91.566
_cell_angle_gamma   113.001
_symmetry_Int_Tables_number   1
_cell_volume   608.922
_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
  K  K0  1  0.005  0.066  0.757  1.0
  K  K1  1  0.066  0.005  0.257  1.0
  K  K2  1  0.414  0.190  0.012  1.0
  K  K3  1  0.190  0.414  0.512  1.0
  K  K4  1  0.412  0.662  0.187  1.0
  K  K5  1  0.662  0.412  0.687  1.0
  K  K6  1  0.863  0.479  0.220  1.0
  K  K7  1  0.479  0.863  0.720  1.0
  P  P8  1  0.065  0.726  0.967  1.0
  P  P9  1  0.726  0.065  0.467  1.0
  P  P10  1  0.773  0.736  0.971  1.0
  P  P11  1  0.736  0.773  0.471  1.0
  H  H12  1  0.825  0.314  0.897  1.0
  H  H13  1  0.314  0.825  0.397  1.0
  H  H14  1  0.746  0.092  0.923  1.0
  H  H15  1  0.092  0.746  0.423  1.0
  H  H16  1  0.382  0.086  0.538  1.0
  H  H17  1  0.086  0.382  0.038  1.0
  H  H18  1  0.162  0.006  0.563  1.0
  H  H19  1  0.006  0.162  0.063  1.0
  H  H20  1  0.449  0.519  0.845  1.0
  H  H21  1  0.519  0.449  0.345  1.0
  H  H22  1  0.225  0.463  0.865  1.0
  H  H23  1  0.463  0.225  0.365  1.0
  H  H24  1  0.695  0.023  0.118  1.0
  H  H25  1  0.023  0.695  0.618  1.0
  H  H26  1  0.686  0.088  0.246  1.0
  H  H27  1  0.088  0.686  0.746  1.0
  O  O28  1  0.155  0.793  0.087  1.0
  O  O29  1  0.793  0.155  0.587  1.0
  O  O30  1  0.176  0.860  0.873  1.0
  O  O31  1  0.860  0.176  0.373  1.0
  O  O32  1  0.036  0.510  0.939  1.0
  O  O33  1  0.510  0.036  0.439  1.0
  O  O34  1  0.656  0.583  0.053  1.0
  O  O35  1  0.583  0.656  0.553  1.0
  O  O36  1  0.685  0.702  0.850  1.0
  O  O37  1  0.702  0.685  0.350  1.0
  O  O38  1  0.812  0.950  0.015  1.0
  O  O39  1  0.950  0.812  0.515  1.0
  O  O40  1  0.720  0.185  0.873  1.0
  O  O41  1  0.185  0.720  0.373  1.0
  O  O42  1  0.290  0.104  0.593  1.0
  O  O43  1  0.104  0.290  0.093  1.0
  O  O44  1  0.317  0.415  0.828  1.0
  O  O45  1  0.415  0.317  0.328  1.0
  O  O46  1  0.621  0.073  0.170  1.0
  O  O47  1  0.073  0.621  0.670  1.0
[/CIF]
.