The material described by UCl3 crystallizes in the monoclinic Pm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one Cl(1), one Cl(4), one Cl(5), two equivalent Cl(2), two equivalent Cl(3), and two equivalent Cl(6) atoms. In the second U site, U(2) is bonded in a 9-coordinate geometry to one Cl(2), one Cl(3), one Cl(6), two equivalent Cl(1), two equivalent Cl(4), and two equivalent Cl(5) atoms. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the second Cl site, Cl(2) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the third Cl site, Cl(3) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the fourth Cl site, Cl(4) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the fifth Cl site, Cl(5) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the sixth Cl site, Cl(6) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_UCl3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.528
_cell_length_b   7.520
_cell_length_c   4.286
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.176
_symmetry_Int_Tables_number   1
_cell_volume   209.760
_cell_formula_units_Z   2
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
  U  U0  1  0.667  0.330  0.750  1.0
  U  U1  1  0.334  0.664  0.250  1.0
  Cl  Cl2  1  0.610  0.698  0.750  1.0
  Cl  Cl3  1  0.915  0.613  0.250  1.0
  Cl  Cl4  1  0.389  0.306  0.250  1.0
  Cl  Cl5  1  0.084  0.388  0.750  1.0
  Cl  Cl6  1  0.305  0.914  0.750  1.0
  Cl  Cl7  1  0.697  0.088  0.250  1.0
[/CIF]
.
The material described by UCl3 crystallizes in the monoclinic Pm space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one Cl(1), one Cl(4), one Cl(5), two equivalent Cl(2), two equivalent Cl(3), and two equivalent Cl(6) atoms. In the second U site, U(2) is bonded in a 9-coordinate geometry to one Cl(2), one Cl(3), one Cl(6), two equivalent Cl(1), two equivalent Cl(4), and two equivalent Cl(5) atoms. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the second Cl site, Cl(2) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the third Cl site, Cl(3) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. In the fourth Cl site, Cl(4) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the fifth Cl site, Cl(5) is bonded in a trigonal non-coplanar geometry to one U(1) and two equivalent U(2) atoms. In the sixth Cl site, Cl(6) is bonded in a trigonal non-coplanar geometry to one U(2) and two equivalent U(1) atoms. is represented by the CIF card [CIF]
data_UCl3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.528
_cell_length_b   7.520
_cell_length_c   4.286
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.176
_symmetry_Int_Tables_number   1
_cell_volume   209.760
_cell_formula_units_Z   2
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
  U  U0  1  0.667  0.330  0.750  1.0
  U  U1  1  0.334  0.664  0.250  1.0
  Cl  Cl2  1  0.610  0.698  0.750  1.0
  Cl  Cl3  1  0.915  0.613  0.250  1.0
  Cl  Cl4  1  0.389  0.306  0.250  1.0
  Cl  Cl5  1  0.084  0.388  0.750  1.0
  Cl  Cl6  1  0.305  0.914  0.750  1.0
  Cl  Cl7  1  0.697  0.088  0.250  1.0
[/CIF]
.