The crystal structure described by K2P3H7O9 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(8), and two equivalent O(7) atoms to form distorted KO7 pentagonal bipyramids that share corners with two equivalent P(2)HO3 tetrahedra, corners with three equivalent P(3)HO3 tetrahedra,  an edgeedge with one K(1)O7 pentagonal bipyramid, and  an edgeedge with one P(1)HO3 tetrahedra. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(1) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share  an edgeedge with one K(1)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one H(3), one O(4), one O(5), and one O(6) atom to form distorted PHO3 tetrahedra that share corners with two equivalent K(1)O7 pentagonal bipyramids. In the third P site, P(3) is bonded to one H(5), one O(7), one O(8), and one O(9) atom to form distorted PHO3 tetrahedra that share corners with three equivalent K(1)O7 pentagonal bipyramids. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(2) atom. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(2) and one O(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth H site, H(6) is bonded in a linear geometry to one O(2) and one O(8) atom. In the seventh H site, H(7) is bonded in a linear geometry to one O(5) and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one P(1), one H(4), and one H(6) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one K(2), one P(2), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one P(2), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(2), one P(2), and one H(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(3), and one H(6) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(3) and one H(7) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2P3H7O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.653
_cell_length_b   8.757
_cell_length_c   9.167
_cell_angle_alpha   100.877
_cell_angle_beta   112.998
_cell_angle_gamma   88.488
_symmetry_Int_Tables_number   1
_cell_volume   554.607
_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  0.684  0.596  0.903  1.0
  K  K1  1  0.316  0.404  0.097  1.0
  K  K2  1  0.591  0.076  0.850  1.0
  K  K3  1  0.409  0.924  0.150  1.0
  P  P4  1  0.060  0.103  0.776  1.0
  P  P5  1  0.940  0.897  0.224  1.0
  P  P6  1  0.531  0.720  0.482  1.0
  P  P7  1  0.469  0.280  0.518  1.0
  P  P8  1  0.145  0.635  0.758  1.0
  P  P9  1  0.855  0.365  0.242  1.0
  H  H10  1  0.073  0.088  0.625  1.0
  H  H11  1  0.927  0.912  0.375  1.0
  H  H12  1  0.853  0.292  0.748  1.0
  H  H13  1  0.147  0.708  0.252  1.0
  H  H14  1  0.658  0.599  0.497  1.0
  H  H15  1  0.342  0.401  0.503  1.0
  H  H16  1  0.747  0.916  0.573  1.0
  H  H17  1  0.253  0.084  0.427  1.0
  H  H18  1  0.071  0.486  0.669  1.0
  H  H19  1  0.929  0.514  0.331  1.0
  H  H20  1  0.953  0.823  0.789  1.0
  H  H21  1  0.047  0.177  0.211  1.0
  H  H22  1  0.302  0.741  0.635  1.0
  H  H23  1  0.698  0.259  0.365  1.0
  O  O24  1  0.254  0.093  0.906  1.0
  O  O25  1  0.746  0.907  0.094  1.0
  O  O26  1  0.902  0.985  0.755  1.0
  O  O27  1  0.098  0.015  0.245  1.0
  O  O28  1  0.994  0.275  0.811  1.0
  O  O29  1  0.006  0.725  0.189  1.0
  O  O30  1  0.363  0.675  0.322  1.0
  O  O31  1  0.637  0.325  0.678  1.0
  O  O32  1  0.494  0.757  0.637  1.0
  O  O33  1  0.506  0.243  0.363  1.0
  O  O34  1  0.645  0.863  0.467  1.0
  O  O35  1  0.355  0.137  0.533  1.0
  O  O36  1  0.323  0.625  0.904  1.0
  O  O37  1  0.677  0.375  0.096  1.0
  O  O38  1  0.974  0.707  0.799  1.0
  O  O39  1  0.026  0.293  0.201  1.0
  O  O40  1  0.167  0.731  0.637  1.0
  O  O41  1  0.833  0.269  0.363  1.0
[/CIF]
.
The crystal structure described by K2P3H7O9 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(3), one O(4), one O(5), one O(8), and two equivalent O(7) atoms to form distorted KO7 pentagonal bipyramids that share corners with two equivalent P(2)HO3 tetrahedra, corners with three equivalent P(3)HO3 tetrahedra,  an edgeedge with one K(1)O7 pentagonal bipyramid, and  an edgeedge with one P(1)HO3 tetrahedra. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(5), one O(6), one O(7), and two equivalent O(1) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share  an edgeedge with one K(1)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one H(3), one O(4), one O(5), and one O(6) atom to form distorted PHO3 tetrahedra that share corners with two equivalent K(1)O7 pentagonal bipyramids. In the third P site, P(3) is bonded to one H(5), one O(7), one O(8), and one O(9) atom to form distorted PHO3 tetrahedra that share corners with three equivalent K(1)O7 pentagonal bipyramids. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(2) atom. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(2) and one O(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth H site, H(6) is bonded in a linear geometry to one O(2) and one O(8) atom. In the seventh H site, H(7) is bonded in a linear geometry to one O(5) and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(2), one P(1), one H(4), and one H(6) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one H(2) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(1), one K(2), one P(2), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one K(2), one P(2), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(2), one P(2), and one H(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(3), and one H(6) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one P(3) and one H(7) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2P3H7O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.653
_cell_length_b   8.757
_cell_length_c   9.167
_cell_angle_alpha   100.877
_cell_angle_beta   112.998
_cell_angle_gamma   88.488
_symmetry_Int_Tables_number   1
_cell_volume   554.607
_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  0.684  0.596  0.903  1.0
  K  K1  1  0.316  0.404  0.097  1.0
  K  K2  1  0.591  0.076  0.850  1.0
  K  K3  1  0.409  0.924  0.150  1.0
  P  P4  1  0.060  0.103  0.776  1.0
  P  P5  1  0.940  0.897  0.224  1.0
  P  P6  1  0.531  0.720  0.482  1.0
  P  P7  1  0.469  0.280  0.518  1.0
  P  P8  1  0.145  0.635  0.758  1.0
  P  P9  1  0.855  0.365  0.242  1.0
  H  H10  1  0.073  0.088  0.625  1.0
  H  H11  1  0.927  0.912  0.375  1.0
  H  H12  1  0.853  0.292  0.748  1.0
  H  H13  1  0.147  0.708  0.252  1.0
  H  H14  1  0.658  0.599  0.497  1.0
  H  H15  1  0.342  0.401  0.503  1.0
  H  H16  1  0.747  0.916  0.573  1.0
  H  H17  1  0.253  0.084  0.427  1.0
  H  H18  1  0.071  0.486  0.669  1.0
  H  H19  1  0.929  0.514  0.331  1.0
  H  H20  1  0.953  0.823  0.789  1.0
  H  H21  1  0.047  0.177  0.211  1.0
  H  H22  1  0.302  0.741  0.635  1.0
  H  H23  1  0.698  0.259  0.365  1.0
  O  O24  1  0.254  0.093  0.906  1.0
  O  O25  1  0.746  0.907  0.094  1.0
  O  O26  1  0.902  0.985  0.755  1.0
  O  O27  1  0.098  0.015  0.245  1.0
  O  O28  1  0.994  0.275  0.811  1.0
  O  O29  1  0.006  0.725  0.189  1.0
  O  O30  1  0.363  0.675  0.322  1.0
  O  O31  1  0.637  0.325  0.678  1.0
  O  O32  1  0.494  0.757  0.637  1.0
  O  O33  1  0.506  0.243  0.363  1.0
  O  O34  1  0.645  0.863  0.467  1.0
  O  O35  1  0.355  0.137  0.533  1.0
  O  O36  1  0.323  0.625  0.904  1.0
  O  O37  1  0.677  0.375  0.096  1.0
  O  O38  1  0.974  0.707  0.799  1.0
  O  O39  1  0.026  0.293  0.201  1.0
  O  O40  1  0.167  0.731  0.637  1.0
  O  O41  1  0.833  0.269  0.363  1.0
[/CIF]
.