The structure described by Mg(ClO4)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Cl(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Cl(1) atom. Cl(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ClO4 tetrahedra that share corners with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-44°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(ClO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.946
_cell_length_b   7.159
_cell_length_c   8.547
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   98.186
_symmetry_Int_Tables_number   1
_cell_volume   299.540
_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
  Mg  Mg0  1  0.500  0.500  0.500  1.0
  Mg  Mg1  1  0.000  0.000  0.000  1.0
  Cl  Cl2  1  0.565  0.254  0.166  1.0
  Cl  Cl3  1  0.935  0.246  0.666  1.0
  Cl  Cl4  1  0.435  0.746  0.834  1.0
  Cl  Cl5  1  0.065  0.754  0.334  1.0
  O  O6  1  0.560  0.293  0.334  1.0
  O  O7  1  0.940  0.207  0.834  1.0
  O  O8  1  0.440  0.707  0.666  1.0
  O  O9  1  0.060  0.793  0.166  1.0
  O  O10  1  0.282  0.210  0.113  1.0
  O  O11  1  0.218  0.290  0.613  1.0
  O  O12  1  0.718  0.790  0.887  1.0
  O  O13  1  0.782  0.710  0.387  1.0
  O  O14  1  0.696  0.082  0.147  1.0
  O  O15  1  0.804  0.418  0.647  1.0
  O  O16  1  0.304  0.918  0.853  1.0
  O  O17  1  0.196  0.582  0.353  1.0
  O  O18  1  0.709  0.410  0.084  1.0
  O  O19  1  0.791  0.090  0.584  1.0
  O  O20  1  0.291  0.590  0.916  1.0
  O  O21  1  0.209  0.910  0.416  1.0
[/CIF]
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The structure described by Mg(ClO4)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form MgO6 octahedra that share corners with six equivalent Cl(1)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mg(1) and one Cl(1) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Cl(1) atom. Cl(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form ClO4 tetrahedra that share corners with three equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-44°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(ClO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.946
_cell_length_b   7.159
_cell_length_c   8.547
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   98.186
_symmetry_Int_Tables_number   1
_cell_volume   299.540
_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
  Mg  Mg0  1  0.500  0.500  0.500  1.0
  Mg  Mg1  1  0.000  0.000  0.000  1.0
  Cl  Cl2  1  0.565  0.254  0.166  1.0
  Cl  Cl3  1  0.935  0.246  0.666  1.0
  Cl  Cl4  1  0.435  0.746  0.834  1.0
  Cl  Cl5  1  0.065  0.754  0.334  1.0
  O  O6  1  0.560  0.293  0.334  1.0
  O  O7  1  0.940  0.207  0.834  1.0
  O  O8  1  0.440  0.707  0.666  1.0
  O  O9  1  0.060  0.793  0.166  1.0
  O  O10  1  0.282  0.210  0.113  1.0
  O  O11  1  0.218  0.290  0.613  1.0
  O  O12  1  0.718  0.790  0.887  1.0
  O  O13  1  0.782  0.710  0.387  1.0
  O  O14  1  0.696  0.082  0.147  1.0
  O  O15  1  0.804  0.418  0.647  1.0
  O  O16  1  0.304  0.918  0.853  1.0
  O  O17  1  0.196  0.582  0.353  1.0
  O  O18  1  0.709  0.410  0.084  1.0
  O  O19  1  0.791  0.090  0.584  1.0
  O  O20  1  0.291  0.590  0.916  1.0
  O  O21  1  0.209  0.910  0.416  1.0
[/CIF]
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