The structure described by Np(BH4)4 is Protactinium structured and crystallizes in the tetragonal P4_2/nmc space group. The structure is zero-dimensional and consists of two Np(BH4)4 clusters. Np(1) is bonded to four equivalent H(2) and eight equivalent H(3) atoms to form NpH12 cuboctahedra that share faces with four equivalent B(1)H4 tetrahedra. B(1) is bonded to one H(1), one H(2), and two equivalent H(3) atoms to form BH4 tetrahedra that share  a faceface with one Np(1)H12 cuboctahedra. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one B(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one Np(1) and one B(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Np(1) and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.814
_cell_length_b   8.815
_cell_length_c   6.017
_cell_angle_alpha   90.000
_cell_angle_beta   90.010
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   467.484
_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
  Np  Np0  1  1.000  0.000  0.000  1.0
  Np  Np1  1  0.500  0.500  0.500  1.0
  B  B2  1  0.232  0.000  0.228  1.0
  B  B3  1  0.500  0.268  0.728  1.0
  B  B4  1  0.500  0.732  0.728  1.0
  B  B5  1  0.768  0.000  0.228  1.0
  B  B6  1  0.268  0.500  0.272  1.0
  B  B7  1  0.732  0.500  0.272  1.0
  B  B8  1  0.000  0.232  0.772  1.0
  B  B9  1  0.000  0.768  0.772  1.0
  H  H10  1  0.344  0.000  0.337  1.0
  H  H11  1  0.500  0.156  0.837  1.0
  H  H12  1  0.500  0.844  0.837  1.0
  H  H13  1  0.656  0.000  0.337  1.0
  H  H14  1  0.156  0.500  0.163  1.0
  H  H15  1  0.844  0.500  0.163  1.0
  H  H16  1  0.000  0.344  0.663  1.0
  H  H17  1  0.000  0.656  0.663  1.0
  H  H18  1  0.254  0.000  0.023  1.0
  H  H19  1  0.500  0.246  0.523  1.0
  H  H20  1  0.500  0.754  0.523  1.0
  H  H21  1  0.746  0.000  0.023  1.0
  H  H22  1  0.246  0.500  0.477  1.0
  H  H23  1  0.754  0.500  0.477  1.0
  H  H24  1  0.000  0.254  0.977  1.0
  H  H25  1  0.000  0.746  0.977  1.0
  H  H26  1  0.147  0.113  0.258  1.0
  H  H27  1  0.612  0.353  0.758  1.0
  H  H28  1  0.387  0.648  0.758  1.0
  H  H29  1  0.853  0.887  0.258  1.0
  H  H30  1  0.353  0.613  0.242  1.0
  H  H31  1  0.647  0.387  0.242  1.0
  H  H32  1  0.113  0.148  0.742  1.0
  H  H33  1  0.888  0.853  0.742  1.0
  H  H34  1  0.353  0.387  0.242  1.0
  H  H35  1  0.888  0.147  0.742  1.0
  H  H36  1  0.113  0.852  0.742  1.0
  H  H37  1  0.647  0.613  0.242  1.0
  H  H38  1  0.147  0.887  0.258  1.0
  H  H39  1  0.853  0.113  0.258  1.0
  H  H40  1  0.387  0.352  0.758  1.0
  H  H41  1  0.612  0.647  0.758  1.0
[/CIF]
.
The structure described by Np(BH4)4 is Protactinium structured and crystallizes in the tetragonal P4_2/nmc space group. The structure is zero-dimensional and consists of two Np(BH4)4 clusters. Np(1) is bonded to four equivalent H(2) and eight equivalent H(3) atoms to form NpH12 cuboctahedra that share faces with four equivalent B(1)H4 tetrahedra. B(1) is bonded to one H(1), one H(2), and two equivalent H(3) atoms to form BH4 tetrahedra that share  a faceface with one Np(1)H12 cuboctahedra. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one B(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one Np(1) and one B(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one Np(1) and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Np(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.814
_cell_length_b   8.815
_cell_length_c   6.017
_cell_angle_alpha   90.000
_cell_angle_beta   90.010
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   467.484
_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
  Np  Np0  1  1.000  0.000  0.000  1.0
  Np  Np1  1  0.500  0.500  0.500  1.0
  B  B2  1  0.232  0.000  0.228  1.0
  B  B3  1  0.500  0.268  0.728  1.0
  B  B4  1  0.500  0.732  0.728  1.0
  B  B5  1  0.768  0.000  0.228  1.0
  B  B6  1  0.268  0.500  0.272  1.0
  B  B7  1  0.732  0.500  0.272  1.0
  B  B8  1  0.000  0.232  0.772  1.0
  B  B9  1  0.000  0.768  0.772  1.0
  H  H10  1  0.344  0.000  0.337  1.0
  H  H11  1  0.500  0.156  0.837  1.0
  H  H12  1  0.500  0.844  0.837  1.0
  H  H13  1  0.656  0.000  0.337  1.0
  H  H14  1  0.156  0.500  0.163  1.0
  H  H15  1  0.844  0.500  0.163  1.0
  H  H16  1  0.000  0.344  0.663  1.0
  H  H17  1  0.000  0.656  0.663  1.0
  H  H18  1  0.254  0.000  0.023  1.0
  H  H19  1  0.500  0.246  0.523  1.0
  H  H20  1  0.500  0.754  0.523  1.0
  H  H21  1  0.746  0.000  0.023  1.0
  H  H22  1  0.246  0.500  0.477  1.0
  H  H23  1  0.754  0.500  0.477  1.0
  H  H24  1  0.000  0.254  0.977  1.0
  H  H25  1  0.000  0.746  0.977  1.0
  H  H26  1  0.147  0.113  0.258  1.0
  H  H27  1  0.612  0.353  0.758  1.0
  H  H28  1  0.387  0.648  0.758  1.0
  H  H29  1  0.853  0.887  0.258  1.0
  H  H30  1  0.353  0.613  0.242  1.0
  H  H31  1  0.647  0.387  0.242  1.0
  H  H32  1  0.113  0.148  0.742  1.0
  H  H33  1  0.888  0.853  0.742  1.0
  H  H34  1  0.353  0.387  0.242  1.0
  H  H35  1  0.888  0.147  0.742  1.0
  H  H36  1  0.113  0.852  0.742  1.0
  H  H37  1  0.647  0.613  0.242  1.0
  H  H38  1  0.147  0.887  0.258  1.0
  H  H39  1  0.853  0.113  0.258  1.0
  H  H40  1  0.387  0.352  0.758  1.0
  H  H41  1  0.612  0.647  0.758  1.0
[/CIF]
.