The material described by Rb2MgH4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a trigonal non-coplanar geometry to one H(2) and two equivalent H(3) atoms. In the second Rb site, Rb(2) is bonded in a 3-coordinate geometry to one H(1) and two equivalent H(3) atoms. Mg(1) is bonded in a tetrahedral geometry to one H(1), one H(2), and two equivalent H(3) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a bent 120 degrees geometry to one Rb(2) and one Mg(1) atom. In the second H site, H(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one Mg(1) atom. In the third H site, H(3) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), and one Mg(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2MgH4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.316
_cell_length_b   10.832
_cell_length_c   13.222
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1047.893
_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
  Rb  Rb0  1  0.250  0.118  0.059  1.0
  Rb  Rb1  1  0.250  0.618  0.441  1.0
  Rb  Rb2  1  0.750  0.882  0.941  1.0
  Rb  Rb3  1  0.750  0.382  0.559  1.0
  Rb  Rb4  1  0.250  0.432  0.816  1.0
  Rb  Rb5  1  0.250  0.932  0.684  1.0
  Rb  Rb6  1  0.750  0.568  0.184  1.0
  Rb  Rb7  1  0.750  0.068  0.316  1.0
  Mg  Mg8  1  0.250  0.773  0.927  1.0
  Mg  Mg9  1  0.250  0.273  0.573  1.0
  Mg  Mg10  1  0.750  0.227  0.073  1.0
  Mg  Mg11  1  0.750  0.727  0.427  1.0
  H  H12  1  0.250  0.607  0.956  1.0
  H  H13  1  0.250  0.107  0.544  1.0
  H  H14  1  0.750  0.393  0.044  1.0
  H  H15  1  0.750  0.893  0.456  1.0
  H  H16  1  0.250  0.871  0.042  1.0
  H  H17  1  0.250  0.371  0.458  1.0
  H  H18  1  0.750  0.129  0.958  1.0
  H  H19  1  0.750  0.629  0.542  1.0
  H  H20  1  0.056  0.821  0.843  1.0
  H  H21  1  0.444  0.321  0.657  1.0
  H  H22  1  0.556  0.179  0.157  1.0
  H  H23  1  0.944  0.679  0.343  1.0
  H  H24  1  0.944  0.179  0.157  1.0
  H  H25  1  0.556  0.679  0.343  1.0
  H  H26  1  0.444  0.821  0.843  1.0
  H  H27  1  0.056  0.321  0.657  1.0
[/CIF]
.
The material described by Rb2MgH4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a trigonal non-coplanar geometry to one H(2) and two equivalent H(3) atoms. In the second Rb site, Rb(2) is bonded in a 3-coordinate geometry to one H(1) and two equivalent H(3) atoms. Mg(1) is bonded in a tetrahedral geometry to one H(1), one H(2), and two equivalent H(3) atoms. There are three inequivalent H sites. In the first H site, H(1) is bonded in a bent 120 degrees geometry to one Rb(2) and one Mg(1) atom. In the second H site, H(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one Mg(1) atom. In the third H site, H(3) is bonded in a 3-coordinate geometry to one Rb(1), one Rb(2), and one Mg(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2MgH4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.316
_cell_length_b   10.832
_cell_length_c   13.222
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1047.893
_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
  Rb  Rb0  1  0.250  0.118  0.059  1.0
  Rb  Rb1  1  0.250  0.618  0.441  1.0
  Rb  Rb2  1  0.750  0.882  0.941  1.0
  Rb  Rb3  1  0.750  0.382  0.559  1.0
  Rb  Rb4  1  0.250  0.432  0.816  1.0
  Rb  Rb5  1  0.250  0.932  0.684  1.0
  Rb  Rb6  1  0.750  0.568  0.184  1.0
  Rb  Rb7  1  0.750  0.068  0.316  1.0
  Mg  Mg8  1  0.250  0.773  0.927  1.0
  Mg  Mg9  1  0.250  0.273  0.573  1.0
  Mg  Mg10  1  0.750  0.227  0.073  1.0
  Mg  Mg11  1  0.750  0.727  0.427  1.0
  H  H12  1  0.250  0.607  0.956  1.0
  H  H13  1  0.250  0.107  0.544  1.0
  H  H14  1  0.750  0.393  0.044  1.0
  H  H15  1  0.750  0.893  0.456  1.0
  H  H16  1  0.250  0.871  0.042  1.0
  H  H17  1  0.250  0.371  0.458  1.0
  H  H18  1  0.750  0.129  0.958  1.0
  H  H19  1  0.750  0.629  0.542  1.0
  H  H20  1  0.056  0.821  0.843  1.0
  H  H21  1  0.444  0.321  0.657  1.0
  H  H22  1  0.556  0.179  0.157  1.0
  H  H23  1  0.944  0.679  0.343  1.0
  H  H24  1  0.944  0.179  0.157  1.0
  H  H25  1  0.556  0.679  0.343  1.0
  H  H26  1  0.444  0.821  0.843  1.0
  H  H27  1  0.056  0.321  0.657  1.0
[/CIF]
.