The compound described by TmH3 crystallizes in the trigonal P-3c1 space group. Tm(1) is bonded in a 11-coordinate geometry to one H(2), two equivalent H(3), and eight equivalent H(1) atoms. There are three inequivalent H sites. In the first H site, H(2) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the second H site, H(3) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the third H site, H(1) is bonded in a 4-coordinate geometry to four equivalent Tm(1) atoms. is represented by the CIF card [CIF]
data_TmH3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.172
_cell_length_b   6.172
_cell_length_c   6.450
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   212.810
_cell_formula_units_Z   6
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
  Tm  Tm0  1  0.337  0.337  0.750  1.0
  Tm  Tm1  1  0.663  0.000  0.750  1.0
  Tm  Tm2  1  0.000  0.663  0.750  1.0
  Tm  Tm3  1  0.337  1.000  0.250  1.0
  Tm  Tm4  1  1.000  0.337  0.250  1.0
  Tm  Tm5  1  0.663  0.663  0.250  1.0
  H  H6  1  0.680  0.647  0.590  1.0
  H  H7  1  0.353  0.033  0.590  1.0
  H  H8  1  0.967  0.320  0.590  1.0
  H  H9  1  0.680  0.033  0.090  1.0
  H  H10  1  0.967  0.647  0.090  1.0
  H  H11  1  0.353  0.320  0.090  1.0
  H  H12  1  0.320  0.353  0.410  1.0
  H  H13  1  0.647  0.967  0.410  1.0
  H  H14  1  0.033  0.680  0.410  1.0
  H  H15  1  0.320  0.967  0.910  1.0
  H  H16  1  0.033  0.353  0.910  1.0
  H  H17  1  0.647  0.680  0.910  1.0
  H  H18  1  1.000  0.000  0.750  1.0
  H  H19  1  0.000  1.000  0.250  1.0
  H  H20  1  0.333  0.667  0.688  1.0
  H  H21  1  0.333  0.667  0.188  1.0
  H  H22  1  0.667  0.333  0.312  1.0
  H  H23  1  0.667  0.333  0.812  1.0
[/CIF]
.
The compound described by TmH3 crystallizes in the trigonal P-3c1 space group. Tm(1) is bonded in a 11-coordinate geometry to one H(2), two equivalent H(3), and eight equivalent H(1) atoms. There are three inequivalent H sites. In the first H site, H(2) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the second H site, H(3) is bonded in a trigonal planar geometry to three equivalent Tm(1) atoms. In the third H site, H(1) is bonded in a 4-coordinate geometry to four equivalent Tm(1) atoms. is represented by the CIF card [CIF]
data_TmH3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.172
_cell_length_b   6.172
_cell_length_c   6.450
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   212.810
_cell_formula_units_Z   6
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
  Tm  Tm0  1  0.337  0.337  0.750  1.0
  Tm  Tm1  1  0.663  0.000  0.750  1.0
  Tm  Tm2  1  0.000  0.663  0.750  1.0
  Tm  Tm3  1  0.337  1.000  0.250  1.0
  Tm  Tm4  1  1.000  0.337  0.250  1.0
  Tm  Tm5  1  0.663  0.663  0.250  1.0
  H  H6  1  0.680  0.647  0.590  1.0
  H  H7  1  0.353  0.033  0.590  1.0
  H  H8  1  0.967  0.320  0.590  1.0
  H  H9  1  0.680  0.033  0.090  1.0
  H  H10  1  0.967  0.647  0.090  1.0
  H  H11  1  0.353  0.320  0.090  1.0
  H  H12  1  0.320  0.353  0.410  1.0
  H  H13  1  0.647  0.967  0.410  1.0
  H  H14  1  0.033  0.680  0.410  1.0
  H  H15  1  0.320  0.967  0.910  1.0
  H  H16  1  0.033  0.353  0.910  1.0
  H  H17  1  0.647  0.680  0.910  1.0
  H  H18  1  1.000  0.000  0.750  1.0
  H  H19  1  0.000  1.000  0.250  1.0
  H  H20  1  0.333  0.667  0.688  1.0
  H  H21  1  0.333  0.667  0.188  1.0
  H  H22  1  0.667  0.333  0.312  1.0
  H  H23  1  0.667  0.333  0.812  1.0
[/CIF]
.