The material structure described by K8UCr4(NO12)2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(4), one O(6), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(8), two equivalent O(12), two equivalent O(5), and two equivalent O(6) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(8) atoms. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(11), one O(2), one O(3), one O(5), one O(6), one O(7), one O(9), and two equivalent O(10) atoms. U(1) is bonded to two equivalent O(11), two equivalent O(4), and two equivalent O(9) atoms to form UO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. In the second Cr site, Cr(2) is bonded to one O(1), one O(12), one O(2), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 42°. N(1) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(3) and one Cr(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one Cr(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(3), one U(1), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(4), two equivalent K(2), and one N(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(4), two equivalent K(2), and one Cr(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(3), one K(4), and one N(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one N(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one U(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to two equivalent K(4) and one Cr(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one K(1), one K(4), one U(1), and one Cr(1) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Cr(2) atom. is represented by the CIF card [CIF]
data_K8UCr4(NO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.236
_cell_length_b   9.851
_cell_length_c   9.882
_cell_angle_alpha   105.656
_cell_angle_beta   97.422
_cell_angle_gamma   93.237
_symmetry_Int_Tables_number   1
_cell_volume   669.548
_cell_formula_units_Z   1
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  0.994  0.737  0.245  1.0
  K  K1  1  0.748  0.491  0.459  1.0
  K  K2  1  0.252  0.509  0.541  1.0
  K  K3  1  0.608  0.304  0.050  1.0
  K  K4  1  0.379  0.091  0.348  1.0
  K  K5  1  0.006  0.263  0.755  1.0
  K  K6  1  0.621  0.909  0.652  1.0
  K  K7  1  0.392  0.696  0.950  1.0
  U  U8  1  0.000  0.000  0.000  1.0
  Cr  Cr9  1  0.129  0.875  0.639  1.0
  Cr  Cr10  1  0.854  0.613  0.841  1.0
  Cr  Cr11  1  0.871  0.125  0.361  1.0
  Cr  Cr12  1  0.146  0.387  0.159  1.0
  N  N13  1  0.495  0.702  0.296  1.0
  N  N14  1  0.505  0.298  0.704  1.0
  O  O15  1  0.782  0.511  0.934  1.0
  O  O16  1  0.328  0.342  0.250  1.0
  O  O17  1  0.711  0.205  0.285  1.0
  O  O18  1  0.983  0.762  0.960  1.0
  O  O19  1  0.529  0.320  0.587  1.0
  O  O20  1  0.017  0.238  0.040  1.0
  O  O21  1  0.975  0.754  0.526  1.0
  O  O22  1  0.218  0.489  0.066  1.0
  O  O23  1  0.471  0.680  0.413  1.0
  O  O24  1  0.602  0.213  0.752  1.0
  O  O25  1  0.672  0.658  0.750  1.0
  O  O26  1  0.385  0.361  0.774  1.0
  O  O27  1  0.744  0.994  0.956  1.0
  O  O28  1  0.234  0.974  0.556  1.0
  O  O29  1  0.398  0.787  0.248  1.0
  O  O30  1  0.615  0.639  0.226  1.0
  O  O31  1  0.016  0.982  0.768  1.0
  O  O32  1  0.025  0.246  0.474  1.0
  O  O33  1  0.256  0.006  0.044  1.0
  O  O34  1  0.766  0.026  0.444  1.0
  O  O35  1  0.011  0.472  0.271  1.0
  O  O36  1  0.289  0.795  0.715  1.0
  O  O37  1  0.989  0.528  0.729  1.0
  O  O38  1  0.984  0.018  0.232  1.0
[/CIF]
.
The material structure described by K8UCr4(NO12)2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(11), one O(12), one O(4), one O(6), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(8), two equivalent O(12), two equivalent O(5), and two equivalent O(6) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(8) atoms. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(11), one O(2), one O(3), one O(5), one O(6), one O(7), one O(9), and two equivalent O(10) atoms. U(1) is bonded to two equivalent O(11), two equivalent O(4), and two equivalent O(9) atoms to form UO6 octahedra that share corners with two equivalent Cr(1)O4 tetrahedra and corners with two equivalent Cr(2)O4 tetrahedra. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(10), one O(11), one O(3), and one O(6) atom to form CrO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 46°. In the second Cr site, Cr(2) is bonded to one O(1), one O(12), one O(2), and one O(4) atom to form CrO4 tetrahedra that share  a cornercorner with one U(1)O6 octahedra. The corner-sharing octahedral tilt angles are 42°. N(1) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(3) and one Cr(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one Cr(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(1), one K(3), one U(1), and one Cr(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(4), two equivalent K(2), and one N(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(4), two equivalent K(2), and one Cr(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(3), one K(4), and one N(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one N(1) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one U(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to two equivalent K(4) and one Cr(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one K(1), one K(4), one U(1), and one Cr(1) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(1), two equivalent K(2), and one Cr(2) atom. is represented by the CIF card [CIF]
data_K8UCr4(NO12)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.236
_cell_length_b   9.851
_cell_length_c   9.882
_cell_angle_alpha   105.656
_cell_angle_beta   97.422
_cell_angle_gamma   93.237
_symmetry_Int_Tables_number   1
_cell_volume   669.548
_cell_formula_units_Z   1
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  0.994  0.737  0.245  1.0
  K  K1  1  0.748  0.491  0.459  1.0
  K  K2  1  0.252  0.509  0.541  1.0
  K  K3  1  0.608  0.304  0.050  1.0
  K  K4  1  0.379  0.091  0.348  1.0
  K  K5  1  0.006  0.263  0.755  1.0
  K  K6  1  0.621  0.909  0.652  1.0
  K  K7  1  0.392  0.696  0.950  1.0
  U  U8  1  0.000  0.000  0.000  1.0
  Cr  Cr9  1  0.129  0.875  0.639  1.0
  Cr  Cr10  1  0.854  0.613  0.841  1.0
  Cr  Cr11  1  0.871  0.125  0.361  1.0
  Cr  Cr12  1  0.146  0.387  0.159  1.0
  N  N13  1  0.495  0.702  0.296  1.0
  N  N14  1  0.505  0.298  0.704  1.0
  O  O15  1  0.782  0.511  0.934  1.0
  O  O16  1  0.328  0.342  0.250  1.0
  O  O17  1  0.711  0.205  0.285  1.0
  O  O18  1  0.983  0.762  0.960  1.0
  O  O19  1  0.529  0.320  0.587  1.0
  O  O20  1  0.017  0.238  0.040  1.0
  O  O21  1  0.975  0.754  0.526  1.0
  O  O22  1  0.218  0.489  0.066  1.0
  O  O23  1  0.471  0.680  0.413  1.0
  O  O24  1  0.602  0.213  0.752  1.0
  O  O25  1  0.672  0.658  0.750  1.0
  O  O26  1  0.385  0.361  0.774  1.0
  O  O27  1  0.744  0.994  0.956  1.0
  O  O28  1  0.234  0.974  0.556  1.0
  O  O29  1  0.398  0.787  0.248  1.0
  O  O30  1  0.615  0.639  0.226  1.0
  O  O31  1  0.016  0.982  0.768  1.0
  O  O32  1  0.025  0.246  0.474  1.0
  O  O33  1  0.256  0.006  0.044  1.0
  O  O34  1  0.766  0.026  0.444  1.0
  O  O35  1  0.011  0.472  0.271  1.0
  O  O36  1  0.289  0.795  0.715  1.0
  O  O37  1  0.989  0.528  0.729  1.0
  O  O38  1  0.984  0.018  0.232  1.0
[/CIF]
.