The compound described by K4C2H6O9 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent H(2), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent H(3), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to one H(1), one H(3), one O(3), one O(4), one O(5), two equivalent O(2), and three equivalent O(1) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one K(3) and one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(5) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one O(5) atom. There are five 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), three equivalent K(3), and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one C(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent K(3) and two equivalent H(1) atoms. In the fifth O site, O(5) is bonded in a water-like geometry to one K(1), one K(2), one K(3), one H(2), and one H(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4H6C2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.211
_cell_length_b   9.211
_cell_length_c   7.217
_cell_angle_alpha   70.378
_cell_angle_beta   70.378
_cell_angle_gamma   97.663
_symmetry_Int_Tables_number   1
_cell_volume   521.943
_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  0.617  0.383  0.250  1.0
  K  K1  1  0.383  0.617  0.750  1.0
  K  K2  1  0.315  0.685  0.250  1.0
  K  K3  1  0.685  0.315  0.750  1.0
  K  K4  1  0.293  0.995  0.460  1.0
  K  K5  1  0.005  0.707  0.040  1.0
  K  K6  1  0.707  0.005  0.540  1.0
  K  K7  1  0.995  0.293  0.960  1.0
  H  H8  1  0.115  0.023  0.155  1.0
  H  H9  1  0.977  0.885  0.345  1.0
  H  H10  1  0.885  0.977  0.845  1.0
  H  H11  1  0.023  0.115  0.655  1.0
  H  H12  1  0.300  0.354  0.131  1.0
  H  H13  1  0.646  0.700  0.369  1.0
  H  H14  1  0.700  0.646  0.869  1.0
  H  H15  1  0.354  0.300  0.631  1.0
  H  H16  1  0.359  0.220  0.049  1.0
  H  H17  1  0.780  0.641  0.451  1.0
  H  H18  1  0.641  0.780  0.951  1.0
  H  H19  1  0.220  0.359  0.549  1.0
  C  C20  1  0.637  0.976  0.150  1.0
  C  C21  1  0.024  0.363  0.350  1.0
  C  C22  1  0.363  0.024  0.850  1.0
  C  C23  1  0.976  0.637  0.650  1.0
  O  O24  1  0.669  0.118  0.148  1.0
  O  O25  1  0.882  0.331  0.352  1.0
  O  O26  1  0.331  0.882  0.852  1.0
  O  O27  1  0.118  0.669  0.648  1.0
  O  O28  1  0.554  0.851  0.333  1.0
  O  O29  1  0.149  0.446  0.167  1.0
  O  O30  1  0.446  0.149  0.667  1.0
  O  O31  1  0.851  0.554  0.833  1.0
  O  O32  1  0.686  0.957  0.970  1.0
  O  O33  1  0.043  0.314  0.530  1.0
  O  O34  1  0.314  0.043  0.030  1.0
  O  O35  1  0.957  0.686  0.470  1.0
  O  O36  1  1.000  0.000  0.250  1.0
  O  O37  1  0.000  1.000  0.750  1.0
  O  O38  1  0.394  0.311  0.086  1.0
  O  O39  1  0.689  0.606  0.414  1.0
  O  O40  1  0.606  0.689  0.914  1.0
  O  O41  1  0.311  0.394  0.586  1.0
[/CIF]
.
The compound described by K4C2H6O9 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent H(2), two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms. In the second K site, K(2) is bonded in a 10-coordinate geometry to two equivalent H(3), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to one H(1), one H(3), one O(3), one O(4), one O(5), two equivalent O(2), and three equivalent O(1) atoms. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one K(3) and one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(5) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one O(5) atom. There are five 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), three equivalent K(3), and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one C(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to two equivalent K(3) and two equivalent H(1) atoms. In the fifth O site, O(5) is bonded in a water-like geometry to one K(1), one K(2), one K(3), one H(2), and one H(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4H6C2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.211
_cell_length_b   9.211
_cell_length_c   7.217
_cell_angle_alpha   70.378
_cell_angle_beta   70.378
_cell_angle_gamma   97.663
_symmetry_Int_Tables_number   1
_cell_volume   521.943
_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  0.617  0.383  0.250  1.0
  K  K1  1  0.383  0.617  0.750  1.0
  K  K2  1  0.315  0.685  0.250  1.0
  K  K3  1  0.685  0.315  0.750  1.0
  K  K4  1  0.293  0.995  0.460  1.0
  K  K5  1  0.005  0.707  0.040  1.0
  K  K6  1  0.707  0.005  0.540  1.0
  K  K7  1  0.995  0.293  0.960  1.0
  H  H8  1  0.115  0.023  0.155  1.0
  H  H9  1  0.977  0.885  0.345  1.0
  H  H10  1  0.885  0.977  0.845  1.0
  H  H11  1  0.023  0.115  0.655  1.0
  H  H12  1  0.300  0.354  0.131  1.0
  H  H13  1  0.646  0.700  0.369  1.0
  H  H14  1  0.700  0.646  0.869  1.0
  H  H15  1  0.354  0.300  0.631  1.0
  H  H16  1  0.359  0.220  0.049  1.0
  H  H17  1  0.780  0.641  0.451  1.0
  H  H18  1  0.641  0.780  0.951  1.0
  H  H19  1  0.220  0.359  0.549  1.0
  C  C20  1  0.637  0.976  0.150  1.0
  C  C21  1  0.024  0.363  0.350  1.0
  C  C22  1  0.363  0.024  0.850  1.0
  C  C23  1  0.976  0.637  0.650  1.0
  O  O24  1  0.669  0.118  0.148  1.0
  O  O25  1  0.882  0.331  0.352  1.0
  O  O26  1  0.331  0.882  0.852  1.0
  O  O27  1  0.118  0.669  0.648  1.0
  O  O28  1  0.554  0.851  0.333  1.0
  O  O29  1  0.149  0.446  0.167  1.0
  O  O30  1  0.446  0.149  0.667  1.0
  O  O31  1  0.851  0.554  0.833  1.0
  O  O32  1  0.686  0.957  0.970  1.0
  O  O33  1  0.043  0.314  0.530  1.0
  O  O34  1  0.314  0.043  0.030  1.0
  O  O35  1  0.957  0.686  0.470  1.0
  O  O36  1  1.000  0.000  0.250  1.0
  O  O37  1  0.000  1.000  0.750  1.0
  O  O38  1  0.394  0.311  0.086  1.0
  O  O39  1  0.689  0.606  0.414  1.0
  O  O40  1  0.606  0.689  0.914  1.0
  O  O41  1  0.311  0.394  0.586  1.0
[/CIF]
.