The structure described by Mg(BH4)2 crystallizes in the tetragonal I4_1/acd space group. The structure consists of a Mg(BH4)2 framework. Mg(1) is bonded to four equivalent H(1) and four equivalent H(2) atoms to form MgH8 hexagonal bipyramids that share edges with four equivalent B(1)H4 tetrahedra. B(1) is bonded to two equivalent H(1) and two equivalent H(2) atoms to form BH4 tetrahedra that share edges with two equivalent Mg(1)H8 hexagonal bipyramids. There are two inequivalent H sites. In the first H site, H(2) is bonded in an L-shaped geometry to one Mg(1) and one B(1) atom. In the second H site, H(1) is bonded in an L-shaped geometry to one Mg(1) and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(BH4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.253
_cell_length_b   8.253
_cell_length_c   8.253
_cell_angle_alpha   124.125
_cell_angle_beta   124.125
_cell_angle_gamma   82.992
_symmetry_Int_Tables_number   1
_cell_volume   369.675
_cell_formula_units_Z   4
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
  Mg  Mg0  1  0.250  0.250  0.000  1.0
  Mg  Mg1  1  0.750  0.750  0.000  1.0
  Mg  Mg2  1  0.500  0.000  0.500  1.0
  Mg  Mg3  1  0.000  0.500  0.500  1.0
  B  B4  1  0.592  0.375  0.717  1.0
  B  B5  1  0.092  0.375  0.217  1.0
  B  B6  1  0.658  0.875  0.283  1.0
  B  B7  1  0.158  0.875  0.783  1.0
  B  B8  1  0.625  0.342  0.217  1.0
  B  B9  1  0.625  0.842  0.717  1.0
  B  B10  1  0.125  0.408  0.783  1.0
  B  B11  1  0.125  0.908  0.283  1.0
  H  H12  1  0.606  0.297  0.813  1.0
  H  H13  1  0.106  0.293  0.309  1.0
  H  H14  1  0.266  0.457  0.313  1.0
  H  H15  1  0.766  0.453  0.809  1.0
  H  H16  1  0.484  0.793  0.187  1.0
  H  H17  1  0.984  0.797  0.691  1.0
  H  H18  1  0.144  0.953  0.687  1.0
  H  H19  1  0.644  0.957  0.191  1.0
  H  H20  1  0.703  0.516  0.309  1.0
  H  H21  1  0.707  0.016  0.813  1.0
  H  H22  1  0.543  0.856  0.809  1.0
  H  H23  1  0.547  0.356  0.313  1.0
  H  H24  1  0.207  0.394  0.691  1.0
  H  H25  1  0.203  0.894  0.187  1.0
  H  H26  1  0.047  0.734  0.191  1.0
  H  H27  1  0.043  0.234  0.687  1.0
  H  H28  1  0.493  0.496  0.750  1.0
  H  H29  1  0.993  0.242  0.997  1.0
  H  H30  1  0.004  0.508  0.250  1.0
  H  H31  1  0.504  0.254  0.497  1.0
  H  H32  1  0.746  0.742  0.250  1.0
  H  H33  1  0.246  0.996  0.003  1.0
  H  H34  1  0.257  0.754  0.750  1.0
  H  H35  1  0.757  0.008  0.503  1.0
  H  H36  1  0.504  0.254  0.997  1.0
  H  H37  1  0.758  0.754  0.750  1.0
  H  H38  1  0.492  0.743  0.497  1.0
  H  H39  1  0.746  0.243  0.250  1.0
  H  H40  1  0.258  0.507  0.003  1.0
  H  H41  1  0.004  0.007  0.250  1.0
  H  H42  1  0.246  0.996  0.503  1.0
  H  H43  1  0.992  0.496  0.750  1.0
[/CIF]
.
The structure described by Mg(BH4)2 crystallizes in the tetragonal I4_1/acd space group. The structure consists of a Mg(BH4)2 framework. Mg(1) is bonded to four equivalent H(1) and four equivalent H(2) atoms to form MgH8 hexagonal bipyramids that share edges with four equivalent B(1)H4 tetrahedra. B(1) is bonded to two equivalent H(1) and two equivalent H(2) atoms to form BH4 tetrahedra that share edges with two equivalent Mg(1)H8 hexagonal bipyramids. There are two inequivalent H sites. In the first H site, H(2) is bonded in an L-shaped geometry to one Mg(1) and one B(1) atom. In the second H site, H(1) is bonded in an L-shaped geometry to one Mg(1) and one B(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(BH4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.253
_cell_length_b   8.253
_cell_length_c   8.253
_cell_angle_alpha   124.125
_cell_angle_beta   124.125
_cell_angle_gamma   82.992
_symmetry_Int_Tables_number   1
_cell_volume   369.675
_cell_formula_units_Z   4
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
  Mg  Mg0  1  0.250  0.250  0.000  1.0
  Mg  Mg1  1  0.750  0.750  0.000  1.0
  Mg  Mg2  1  0.500  0.000  0.500  1.0
  Mg  Mg3  1  0.000  0.500  0.500  1.0
  B  B4  1  0.592  0.375  0.717  1.0
  B  B5  1  0.092  0.375  0.217  1.0
  B  B6  1  0.658  0.875  0.283  1.0
  B  B7  1  0.158  0.875  0.783  1.0
  B  B8  1  0.625  0.342  0.217  1.0
  B  B9  1  0.625  0.842  0.717  1.0
  B  B10  1  0.125  0.408  0.783  1.0
  B  B11  1  0.125  0.908  0.283  1.0
  H  H12  1  0.606  0.297  0.813  1.0
  H  H13  1  0.106  0.293  0.309  1.0
  H  H14  1  0.266  0.457  0.313  1.0
  H  H15  1  0.766  0.453  0.809  1.0
  H  H16  1  0.484  0.793  0.187  1.0
  H  H17  1  0.984  0.797  0.691  1.0
  H  H18  1  0.144  0.953  0.687  1.0
  H  H19  1  0.644  0.957  0.191  1.0
  H  H20  1  0.703  0.516  0.309  1.0
  H  H21  1  0.707  0.016  0.813  1.0
  H  H22  1  0.543  0.856  0.809  1.0
  H  H23  1  0.547  0.356  0.313  1.0
  H  H24  1  0.207  0.394  0.691  1.0
  H  H25  1  0.203  0.894  0.187  1.0
  H  H26  1  0.047  0.734  0.191  1.0
  H  H27  1  0.043  0.234  0.687  1.0
  H  H28  1  0.493  0.496  0.750  1.0
  H  H29  1  0.993  0.242  0.997  1.0
  H  H30  1  0.004  0.508  0.250  1.0
  H  H31  1  0.504  0.254  0.497  1.0
  H  H32  1  0.746  0.742  0.250  1.0
  H  H33  1  0.246  0.996  0.003  1.0
  H  H34  1  0.257  0.754  0.750  1.0
  H  H35  1  0.757  0.008  0.503  1.0
  H  H36  1  0.504  0.254  0.997  1.0
  H  H37  1  0.758  0.754  0.750  1.0
  H  H38  1  0.492  0.743  0.497  1.0
  H  H39  1  0.746  0.243  0.250  1.0
  H  H40  1  0.258  0.507  0.003  1.0
  H  H41  1  0.004  0.007  0.250  1.0
  H  H42  1  0.246  0.996  0.503  1.0
  H  H43  1  0.992  0.496  0.750  1.0
[/CIF]
.