data_MgAg4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.81
_cell_length_b   9.81
_cell_length_c   9.81
_cell_angle_alpha   161.94
_cell_angle_beta   161.94
_cell_angle_gamma   25.65
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgAg4
_chemical_formula_sum   'Mg1 Ag4'
_cell_volume   90.65
_cell_formula_units_Z   1
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  Mg4  1  0.0  0.0  0.0  1.0
  Ag  Ag0  1  0.0  0.0  0.44  1.0
  Ag  Ag1  1  0.0  0.0  0.81  1.0
  Ag  Ag2  1  0.0  0.0  0.31  1.0
  Ag  Ag3  1  0.0  0.0  0.69  1.0

data_MgAg4
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.35
_cell_length_b   4.35
_cell_length_c   9.81
_cell_angle_alpha   90.0
_cell_angle_beta   102.82
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgAg4
_chemical_formula_sum   'Mg2 Ag8'
_cell_volume   181.3
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.0  1.0
  Ag  Ag1  2  0.0  0.0  0.19  1.0
  Ag  Ag2  2  0.0  0.0  0.31  1.0
  Ag  Ag3  2  0.0  0.0  0.56  1.0
  Ag  Ag4  2  0.0  0.0  0.69  1.0

Mg Ag Ag Ag Ag
MgAg4 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two MgAg4 clusters. Mg(1) is bonded in a distorted single-bond geometry to one Ag(2) and one Ag(3) atom. The Mg(1)-Ag(2) bond length is 1.83 Å. The Mg(1)-Ag(3) bond length is 3.06 Å. There are three inequivalent Ag sites. In the first Ag site, Ag(1,4) is bonded in a distorted single-bond geometry to one Ag(3) atom. The Ag(1,4)-Ag(3) bond length is 1.23 Å. In the second Ag site, Ag(2) is bonded in a linear geometry to one Mg(1) and one Ag(1,4) atom. The Ag(2)-Ag(1,4) bond length is 1.23 Å. In the third Ag site, Ag(3) is bonded in a distorted linear geometry to one Mg(1) and one Ag(1,4) atom.