The material structure described by K4NpS2O10Cl crystallizes in the monoclinic P2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(2), one O(4), two equivalent O(3), three equivalent O(1), and one Cl(1) atom to form distorted KClO7 hexagonal bipyramids that share  a cornercorner with one K(1)ClO7 hexagonal bipyramid,  a cornercorner with one S(1)O4 tetrahedra, edges with four equivalent K(1)ClO7 hexagonal bipyramids, and edges with two equivalent S(1)O4 tetrahedra. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), three equivalent O(5), and two equivalent Cl(1) atoms. Np(1) is bonded in a distorted linear geometry to two equivalent O(3) atoms. S(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SO4 tetrahedra that share  a cornercorner with one K(1)ClO7 hexagonal bipyramid and edges with two equivalent K(1)ClO7 hexagonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Np(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to three equivalent K(2) and one S(1) atom. Cl(1) is bonded to two equivalent K(1) and four equivalent K(2) atoms to form edge-sharing ClK6 octahedra. is represented by the CIF file [CIF]
data_K4NpS2ClO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.582
_cell_length_b   10.238
_cell_length_c   15.729
_cell_angle_alpha   64.046
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   663.487
_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  0.236  0.832  0.607  1.0
  K  K1  1  0.772  0.565  0.870  1.0
  K  K2  1  0.764  0.832  0.107  1.0
  K  K3  1  0.764  0.168  0.393  1.0
  K  K4  1  0.228  0.435  0.130  1.0
  K  K5  1  0.772  0.435  0.630  1.0
  K  K6  1  0.236  0.168  0.893  1.0
  K  K7  1  0.228  0.565  0.370  1.0
  Np  Np8  1  0.738  0.000  0.750  1.0
  Np  Np9  1  0.262  0.000  0.250  1.0
  S  S10  1  0.343  0.204  0.569  1.0
  S  S11  1  0.657  0.796  0.431  1.0
  S  S12  1  0.657  0.204  0.069  1.0
  S  S13  1  0.343  0.796  0.931  1.0
  Cl  Cl14  1  0.267  0.500  0.750  1.0
  Cl  Cl15  1  0.733  0.500  0.250  1.0
  O  O16  1  0.255  0.827  0.011  1.0
  O  O17  1  0.331  0.189  0.081  1.0
  O  O18  1  0.261  0.849  0.215  1.0
  O  O19  1  0.331  0.811  0.419  1.0
  O  O20  1  0.771  0.086  0.162  1.0
  O  O21  1  0.745  0.827  0.510  1.0
  O  O22  1  0.669  0.189  0.581  1.0
  O  O23  1  0.745  0.173  0.990  1.0
  O  O24  1  0.229  0.914  0.838  1.0
  O  O25  1  0.749  0.350  0.056  1.0
  O  O26  1  0.251  0.650  0.944  1.0
  O  O27  1  0.749  0.650  0.444  1.0
  O  O28  1  0.771  0.914  0.338  1.0
  O  O29  1  0.229  0.086  0.662  1.0
  O  O30  1  0.255  0.173  0.489  1.0
  O  O31  1  0.739  0.849  0.715  1.0
  O  O32  1  0.251  0.350  0.556  1.0
  O  O33  1  0.739  0.151  0.785  1.0
  O  O34  1  0.261  0.151  0.285  1.0
  O  O35  1  0.669  0.811  0.919  1.0
[/CIF]
.
The material structure described by K4NpS2O10Cl crystallizes in the monoclinic P2/c space group. There are two inequivalent K sites. In the first K site, K(1) is bonded to one O(2), one O(4), two equivalent O(3), three equivalent O(1), and one Cl(1) atom to form distorted KClO7 hexagonal bipyramids that share  a cornercorner with one K(1)ClO7 hexagonal bipyramid,  a cornercorner with one S(1)O4 tetrahedra, edges with four equivalent K(1)ClO7 hexagonal bipyramids, and edges with two equivalent S(1)O4 tetrahedra. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(2), one O(3), three equivalent O(5), and two equivalent Cl(1) atoms. Np(1) is bonded in a distorted linear geometry to two equivalent O(3) atoms. S(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SO4 tetrahedra that share  a cornercorner with one K(1)ClO7 hexagonal bipyramid and edges with two equivalent K(1)ClO7 hexagonal bipyramids. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to three equivalent K(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one S(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2), two equivalent K(1), and one Np(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1) and one S(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to three equivalent K(2) and one S(1) atom. Cl(1) is bonded to two equivalent K(1) and four equivalent K(2) atoms to form edge-sharing ClK6 octahedra. is represented by the CIF file [CIF]
data_K4NpS2ClO10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.582
_cell_length_b   10.238
_cell_length_c   15.729
_cell_angle_alpha   64.046
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   663.487
_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  0.236  0.832  0.607  1.0
  K  K1  1  0.772  0.565  0.870  1.0
  K  K2  1  0.764  0.832  0.107  1.0
  K  K3  1  0.764  0.168  0.393  1.0
  K  K4  1  0.228  0.435  0.130  1.0
  K  K5  1  0.772  0.435  0.630  1.0
  K  K6  1  0.236  0.168  0.893  1.0
  K  K7  1  0.228  0.565  0.370  1.0
  Np  Np8  1  0.738  0.000  0.750  1.0
  Np  Np9  1  0.262  0.000  0.250  1.0
  S  S10  1  0.343  0.204  0.569  1.0
  S  S11  1  0.657  0.796  0.431  1.0
  S  S12  1  0.657  0.204  0.069  1.0
  S  S13  1  0.343  0.796  0.931  1.0
  Cl  Cl14  1  0.267  0.500  0.750  1.0
  Cl  Cl15  1  0.733  0.500  0.250  1.0
  O  O16  1  0.255  0.827  0.011  1.0
  O  O17  1  0.331  0.189  0.081  1.0
  O  O18  1  0.261  0.849  0.215  1.0
  O  O19  1  0.331  0.811  0.419  1.0
  O  O20  1  0.771  0.086  0.162  1.0
  O  O21  1  0.745  0.827  0.510  1.0
  O  O22  1  0.669  0.189  0.581  1.0
  O  O23  1  0.745  0.173  0.990  1.0
  O  O24  1  0.229  0.914  0.838  1.0
  O  O25  1  0.749  0.350  0.056  1.0
  O  O26  1  0.251  0.650  0.944  1.0
  O  O27  1  0.749  0.650  0.444  1.0
  O  O28  1  0.771  0.914  0.338  1.0
  O  O29  1  0.229  0.086  0.662  1.0
  O  O30  1  0.255  0.173  0.489  1.0
  O  O31  1  0.739  0.849  0.715  1.0
  O  O32  1  0.251  0.350  0.556  1.0
  O  O33  1  0.739  0.151  0.785  1.0
  O  O34  1  0.261  0.151  0.285  1.0
  O  O35  1  0.669  0.811  0.919  1.0
[/CIF]
.