data_FeSnAs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.72
_cell_length_b   4.72
_cell_length_c   3.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   FeSnAs2
_chemical_formula_sum   'Fe1 Sn1 As2'
_cell_volume   74.65
_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
  Fe  Fe2  1  0.0  0.0  0.0  1.0
  Sn  Sn3  1  0.36  0.36  0.0  1.0
  As  As0  1  0.36  0.0  0.67  1.0
  As  As1  1  0.0  0.36  0.67  1.0

data_FeSnAs2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.68
_cell_length_b   6.68
_cell_length_c   3.35
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   FeSnAs2
_chemical_formula_sum   'Fe2 Sn2 As4'
_cell_volume   149.31
_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
  Fe  Fe0  2  0.0  0.0  0.0  1.0
  Sn  Sn1  2  0.36  0.0  0.0  1.0
  As  As2  4  0.18  0.18  0.67  1.0

Fe Sn As As
Fe Sn As As 0 2 o o - 0 3 o o - 0 1 o o o 1 3 o o - 1 2 o o - 2 3 o o o 
FeSnAs2 crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two FeSnAs2 clusters. Fe(1) is bonded in a 2-coordinate geometry to two equivalent As(1) atoms. Both Fe(1)-As(1) bond lengths are 2.03 Å. Sn(1) is bonded in a 2-coordinate geometry to two equivalent As(1) atoms. Both Sn(1)-As(1) bond lengths are 2.03 Å. As(1) is bonded in a 2-coordinate geometry to one Fe(1) and one Sn(1) atom.