The material structure described by KAl(BH4)4 crystallizes in the orthorhombic Fddd space group. K(1) is bonded in a 8-coordinate geometry to four equivalent H(2) and four equivalent H(4) atoms. Al(1) is bonded to four equivalent H(1) and four equivalent H(3) atoms to form distorted AlH8 hexagonal bipyramids that share edges with four equivalent B(1)H4 tetrahedra. B(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form BH4 tetrahedra that share  an edgeedge with one Al(1)H8 hexagonal bipyramid. There are four inequivalent H sites. In the first H site, H(3) is bonded in an L-shaped geometry to one Al(1) and one B(1) atom. In the second H site, H(4) is bonded in a single-bond geometry to one K(1) and one B(1) atom. In the third H site, H(1) is bonded in an L-shaped geometry to one Al(1) and one B(1) atom. In the fourth H site, H(2) is bonded in a distorted single-bond geometry to one K(1) and one B(1) atom. is represented by the CIF card [CIF]
data_KAl(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.375
_cell_length_b   8.375
_cell_length_c   8.920
_cell_angle_alpha   109.262
_cell_angle_beta   109.262
_cell_angle_gamma   107.297
_symmetry_Int_Tables_number   1
_cell_volume   496.325
_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  0.375  0.125  0.250  1.0
  K  K1  1  0.625  0.875  0.750  1.0
  Al  Al2  1  0.125  0.375  0.750  1.0
  Al  Al3  1  0.875  0.625  0.250  1.0
  B  B4  1  0.758  0.644  0.445  1.0
  B  B5  1  0.699  0.313  0.055  1.0
  B  B6  1  0.856  0.742  0.055  1.0
  B  B7  1  0.187  0.801  0.445  1.0
  B  B8  1  0.242  0.356  0.555  1.0
  B  B9  1  0.301  0.687  0.945  1.0
  B  B10  1  0.144  0.258  0.945  1.0
  B  B11  1  0.813  0.199  0.555  1.0
  H  H12  1  0.748  0.730  0.354  1.0
  H  H13  1  0.876  0.394  0.146  1.0
  H  H14  1  0.770  0.752  0.146  1.0
  H  H15  1  0.106  0.624  0.354  1.0
  H  H16  1  0.252  0.270  0.646  1.0
  H  H17  1  0.124  0.606  0.854  1.0
  H  H18  1  0.230  0.248  0.854  1.0
  H  H19  1  0.894  0.376  0.646  1.0
  H  H20  1  0.846  0.766  0.600  1.0
  H  H21  1  0.665  0.246  0.900  1.0
  H  H22  1  0.734  0.654  0.900  1.0
  H  H23  1  0.254  0.835  0.600  1.0
  H  H24  1  0.154  0.234  0.400  1.0
  H  H25  1  0.335  0.754  0.100  1.0
  H  H26  1  0.266  0.346  0.100  1.0
  H  H27  1  0.746  0.165  0.400  1.0
  H  H28  1  0.850  0.555  0.423  1.0
  H  H29  1  0.631  0.427  0.077  1.0
  H  H30  1  0.945  0.650  0.077  1.0
  H  H31  1  0.073  0.869  0.423  1.0
  H  H32  1  0.150  0.445  0.577  1.0
  H  H33  1  0.369  0.573  0.923  1.0
  H  H34  1  0.055  0.350  0.923  1.0
  H  H35  1  0.927  0.131  0.577  1.0
  H  H36  1  0.595  0.530  0.387  1.0
  H  H37  1  0.643  0.208  0.113  1.0
  H  H38  1  0.970  0.905  0.113  1.0
  H  H39  1  0.292  0.857  0.387  1.0
  H  H40  1  0.405  0.470  0.613  1.0
  H  H41  1  0.357  0.792  0.887  1.0
  H  H42  1  0.030  0.095  0.887  1.0
  H  H43  1  0.708  0.143  0.613  1.0
[/CIF]
.
The material structure described by KAl(BH4)4 crystallizes in the orthorhombic Fddd space group. K(1) is bonded in a 8-coordinate geometry to four equivalent H(2) and four equivalent H(4) atoms. Al(1) is bonded to four equivalent H(1) and four equivalent H(3) atoms to form distorted AlH8 hexagonal bipyramids that share edges with four equivalent B(1)H4 tetrahedra. B(1) is bonded to one H(1), one H(2), one H(3), and one H(4) atom to form BH4 tetrahedra that share  an edgeedge with one Al(1)H8 hexagonal bipyramid. There are four inequivalent H sites. In the first H site, H(3) is bonded in an L-shaped geometry to one Al(1) and one B(1) atom. In the second H site, H(4) is bonded in a single-bond geometry to one K(1) and one B(1) atom. In the third H site, H(1) is bonded in an L-shaped geometry to one Al(1) and one B(1) atom. In the fourth H site, H(2) is bonded in a distorted single-bond geometry to one K(1) and one B(1) atom. is represented by the CIF card [CIF]
data_KAl(BH4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.375
_cell_length_b   8.375
_cell_length_c   8.920
_cell_angle_alpha   109.262
_cell_angle_beta   109.262
_cell_angle_gamma   107.297
_symmetry_Int_Tables_number   1
_cell_volume   496.325
_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  0.375  0.125  0.250  1.0
  K  K1  1  0.625  0.875  0.750  1.0
  Al  Al2  1  0.125  0.375  0.750  1.0
  Al  Al3  1  0.875  0.625  0.250  1.0
  B  B4  1  0.758  0.644  0.445  1.0
  B  B5  1  0.699  0.313  0.055  1.0
  B  B6  1  0.856  0.742  0.055  1.0
  B  B7  1  0.187  0.801  0.445  1.0
  B  B8  1  0.242  0.356  0.555  1.0
  B  B9  1  0.301  0.687  0.945  1.0
  B  B10  1  0.144  0.258  0.945  1.0
  B  B11  1  0.813  0.199  0.555  1.0
  H  H12  1  0.748  0.730  0.354  1.0
  H  H13  1  0.876  0.394  0.146  1.0
  H  H14  1  0.770  0.752  0.146  1.0
  H  H15  1  0.106  0.624  0.354  1.0
  H  H16  1  0.252  0.270  0.646  1.0
  H  H17  1  0.124  0.606  0.854  1.0
  H  H18  1  0.230  0.248  0.854  1.0
  H  H19  1  0.894  0.376  0.646  1.0
  H  H20  1  0.846  0.766  0.600  1.0
  H  H21  1  0.665  0.246  0.900  1.0
  H  H22  1  0.734  0.654  0.900  1.0
  H  H23  1  0.254  0.835  0.600  1.0
  H  H24  1  0.154  0.234  0.400  1.0
  H  H25  1  0.335  0.754  0.100  1.0
  H  H26  1  0.266  0.346  0.100  1.0
  H  H27  1  0.746  0.165  0.400  1.0
  H  H28  1  0.850  0.555  0.423  1.0
  H  H29  1  0.631  0.427  0.077  1.0
  H  H30  1  0.945  0.650  0.077  1.0
  H  H31  1  0.073  0.869  0.423  1.0
  H  H32  1  0.150  0.445  0.577  1.0
  H  H33  1  0.369  0.573  0.923  1.0
  H  H34  1  0.055  0.350  0.923  1.0
  H  H35  1  0.927  0.131  0.577  1.0
  H  H36  1  0.595  0.530  0.387  1.0
  H  H37  1  0.643  0.208  0.113  1.0
  H  H38  1  0.970  0.905  0.113  1.0
  H  H39  1  0.292  0.857  0.387  1.0
  H  H40  1  0.405  0.470  0.613  1.0
  H  H41  1  0.357  0.792  0.887  1.0
  H  H42  1  0.030  0.095  0.887  1.0
  H  H43  1  0.708  0.143  0.613  1.0
[/CIF]
.