data_MgTcIr2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.76
_cell_length_b   2.76
_cell_length_c   8.0
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   MgTcIr2
_chemical_formula_sum   'Mg1 Tc1 Ir2'
_cell_volume   61.01
_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  Mg2  1  0.0  0.0  0.93  1.0
  Tc  Tc3  1  0.38  0.38  0.15  1.0
  Ir  Ir0  1  0.0  0.0  0.98  1.0
  Ir  Ir1  1  0.38  0.38  0.93  1.0

data_MgTcIr2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.91
_cell_length_b   3.91
_cell_length_c   8.0
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   MgTcIr2
_chemical_formula_sum   'Mg2 Tc2 Ir4'
_cell_volume   122.02
_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  0.93  1.0
  Tc  Tc1  2  0.38  0.0  0.15  1.0
  Ir  Ir2  2  0.0  0.0  0.98  1.0
  Ir  Ir3  2  0.38  0.0  0.93  1.0

Mg Tc Ir Ir
Mg Tc Ir Ir 0 2 o o o 0 3 o o o 1 2 o o - 1 3 o o - 2 3 o o o 
MgTcIr2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two MgTcIr2 clusters. Mg(1) is bonded in a single-bond geometry to one Ir(1) and one Ir(2) atom. The Mg(1)-Ir(1) bond length is 0.34 Å. The Mg(1)-Ir(2) bond length is 1.49 Å. Tc(1) is bonded in a 1-coordinate geometry to one Ir(2) atom. The Tc(1)-Ir(2) bond length is 1.75 Å. There are two inequivalent Ir sites. In the first Ir site, Ir(1) is bonded in a single-bond geometry to one Mg(1) atom. In the second Ir site, Ir(2) is bonded in a 2-coordinate geometry to one Mg(1) and one Tc(1) atom.