The crystal structure described by K5U2O4F9 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(2), one F(5), and two equivalent F(1) atoms to form distorted KO2F3 trigonal bipyramids that share corners with three equivalent U(1)O2F5 pentagonal bipyramids,  an edgeedge with one U(1)O2F5 pentagonal bipyramid, and  an edgeedge with one K(1)O2F3 trigonal bipyramid. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(2), one F(5), two equivalent F(2), and two equivalent F(4) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent F(2), and two equivalent F(4) atoms. U(1) is bonded to one O(1), one O(2), one F(1), one F(2), one F(3), one F(4), and one F(5) atom to form distorted UO2F5 pentagonal bipyramids that share  a cornercorner with one U(1)O2F5 pentagonal bipyramid, corners with three equivalent K(1)O2F3 trigonal bipyramids, and  an edgeedge with one K(1)O2F3 trigonal bipyramid. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one U(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), and one U(1) atom. There are five inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to two equivalent K(1) and one U(1) atom. In the second F site, F(2) is bonded to one K(3), two equivalent K(2), and one U(1) atom to form a mixture of corner and edge-sharing FK3U trigonal pyramids. In the third F site, F(3) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(2), and one U(1) atom. In the fifth F site, F(5) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one U(1) atom. is represented by the CIF card [CIF]
data_K5U2O4F9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.436
_cell_length_b   10.959
_cell_length_c   13.231
_cell_angle_alpha   102.046
_cell_angle_beta   90.000
_cell_angle_gamma   107.076
_symmetry_Int_Tables_number   1
_cell_volume   870.511
_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  0.191  0.917  0.435  1.0
  K  K1  1  0.504  0.433  0.622  1.0
  K  K2  1  0.071  0.567  0.878  1.0
  K  K3  1  0.726  0.917  0.935  1.0
  K  K4  1  0.929  0.433  0.122  1.0
  K  K5  1  0.496  0.567  0.378  1.0
  K  K6  1  0.809  0.083  0.565  1.0
  K  K7  1  0.000  0.500  0.500  1.0
  K  K8  1  0.274  0.083  0.065  1.0
  K  K9  1  0.500  0.500  0.000  1.0
  U  U10  1  0.436  0.218  0.809  1.0
  U  U11  1  0.218  0.782  0.691  1.0
  U  U12  1  0.782  0.218  0.309  1.0
  U  U13  1  0.564  0.782  0.191  1.0
  O  O14  1  0.754  0.769  0.087  1.0
  O  O15  1  0.642  0.219  0.712  1.0
  O  O16  1  0.246  0.231  0.913  1.0
  O  O17  1  0.985  0.231  0.413  1.0
  O  O18  1  0.358  0.781  0.288  1.0
  O  O19  1  0.423  0.781  0.788  1.0
  O  O20  1  0.577  0.219  0.212  1.0
  O  O21  1  0.015  0.769  0.587  1.0
  F  F22  1  0.544  0.104  0.403  1.0
  F  F23  1  0.636  0.371  0.419  1.0
  F  F24  1  0.230  0.000  0.750  1.0
  F  F25  1  0.456  0.896  0.597  1.0
  F  F26  1  0.560  0.104  0.903  1.0
  F  F27  1  0.002  0.426  0.307  1.0
  F  F28  1  0.576  0.574  0.193  1.0
  F  F29  1  0.770  0.000  0.250  1.0
  F  F30  1  0.013  0.796  0.829  1.0
  F  F31  1  0.734  0.371  0.919  1.0
  F  F32  1  0.364  0.629  0.581  1.0
  F  F33  1  0.266  0.629  0.081  1.0
  F  F34  1  0.987  0.204  0.171  1.0
  F  F35  1  0.998  0.574  0.693  1.0
  F  F36  1  0.440  0.896  0.097  1.0
  F  F37  1  0.783  0.796  0.329  1.0
  F  F38  1  0.217  0.204  0.671  1.0
  F  F39  1  0.424  0.426  0.807  1.0
[/CIF]
.
The crystal structure described by K5U2O4F9 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to one O(1), one O(2), one F(5), and two equivalent F(1) atoms to form distorted KO2F3 trigonal bipyramids that share corners with three equivalent U(1)O2F5 pentagonal bipyramids,  an edgeedge with one U(1)O2F5 pentagonal bipyramid, and  an edgeedge with one K(1)O2F3 trigonal bipyramid. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(2), one F(5), two equivalent F(2), and two equivalent F(4) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent F(2), and two equivalent F(4) atoms. U(1) is bonded to one O(1), one O(2), one F(1), one F(2), one F(3), one F(4), and one F(5) atom to form distorted UO2F5 pentagonal bipyramids that share  a cornercorner with one U(1)O2F5 pentagonal bipyramid, corners with three equivalent K(1)O2F3 trigonal bipyramids, and  an edgeedge with one K(1)O2F3 trigonal bipyramid. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one U(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), and one U(1) atom. There are five inequivalent F sites. In the first F site, F(1) is bonded in a distorted T-shaped geometry to two equivalent K(1) and one U(1) atom. In the second F site, F(2) is bonded to one K(3), two equivalent K(2), and one U(1) atom to form a mixture of corner and edge-sharing FK3U trigonal pyramids. In the third F site, F(3) is bonded in a bent 150 degrees geometry to two equivalent U(1) atoms. In the fourth F site, F(4) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(2), and one U(1) atom. In the fifth F site, F(5) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one U(1) atom. is represented by the CIF card [CIF]
data_K5U2O4F9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.436
_cell_length_b   10.959
_cell_length_c   13.231
_cell_angle_alpha   102.046
_cell_angle_beta   90.000
_cell_angle_gamma   107.076
_symmetry_Int_Tables_number   1
_cell_volume   870.511
_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  0.191  0.917  0.435  1.0
  K  K1  1  0.504  0.433  0.622  1.0
  K  K2  1  0.071  0.567  0.878  1.0
  K  K3  1  0.726  0.917  0.935  1.0
  K  K4  1  0.929  0.433  0.122  1.0
  K  K5  1  0.496  0.567  0.378  1.0
  K  K6  1  0.809  0.083  0.565  1.0
  K  K7  1  0.000  0.500  0.500  1.0
  K  K8  1  0.274  0.083  0.065  1.0
  K  K9  1  0.500  0.500  0.000  1.0
  U  U10  1  0.436  0.218  0.809  1.0
  U  U11  1  0.218  0.782  0.691  1.0
  U  U12  1  0.782  0.218  0.309  1.0
  U  U13  1  0.564  0.782  0.191  1.0
  O  O14  1  0.754  0.769  0.087  1.0
  O  O15  1  0.642  0.219  0.712  1.0
  O  O16  1  0.246  0.231  0.913  1.0
  O  O17  1  0.985  0.231  0.413  1.0
  O  O18  1  0.358  0.781  0.288  1.0
  O  O19  1  0.423  0.781  0.788  1.0
  O  O20  1  0.577  0.219  0.212  1.0
  O  O21  1  0.015  0.769  0.587  1.0
  F  F22  1  0.544  0.104  0.403  1.0
  F  F23  1  0.636  0.371  0.419  1.0
  F  F24  1  0.230  0.000  0.750  1.0
  F  F25  1  0.456  0.896  0.597  1.0
  F  F26  1  0.560  0.104  0.903  1.0
  F  F27  1  0.002  0.426  0.307  1.0
  F  F28  1  0.576  0.574  0.193  1.0
  F  F29  1  0.770  0.000  0.250  1.0
  F  F30  1  0.013  0.796  0.829  1.0
  F  F31  1  0.734  0.371  0.919  1.0
  F  F32  1  0.364  0.629  0.581  1.0
  F  F33  1  0.266  0.629  0.081  1.0
  F  F34  1  0.987  0.204  0.171  1.0
  F  F35  1  0.998  0.574  0.693  1.0
  F  F36  1  0.440  0.896  0.097  1.0
  F  F37  1  0.783  0.796  0.329  1.0
  F  F38  1  0.217  0.204  0.671  1.0
  F  F39  1  0.424  0.426  0.807  1.0
[/CIF]
.