The structure described by La3CBr5 crystallizes in the monoclinic C2/c space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one C(1), one Br(2), one Br(3), one Br(4), one Br(6), and two equivalent Br(5) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one C(1), one Br(1), one Br(4), one Br(5), one Br(6), one Br(7), and two equivalent Br(2) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to two equivalent C(1), one Br(1), one Br(2), one Br(3), one Br(4), one Br(5), and one Br(7) atom. C(1) is bonded to one La(1), one La(2), and two equivalent La(3) atoms to form CLa4 tetrahedra that share  a cornercorner with one Br(5)La4 tetrahedra, corners with two equivalent Br(6)La4 tetrahedra, corners with three equivalent Br(1)La4 tetrahedra,  an edgeedge with one C(1)La4 tetrahedra, and edges with two equivalent Br(5)La4 tetrahedra. There are seven inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent La(2) and two equivalent La(3) atoms to form BrLa4 tetrahedra that share corners with four equivalent Br(5)La4 tetrahedra, corners with six equivalent C(1)La4 tetrahedra, and  an edgeedge with one Br(6)La4 tetrahedra. In the second Br site, Br(2) is bonded in a rectangular see-saw-like geometry to one La(1), one La(3), and two equivalent La(2) atoms. In the third Br site, Br(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent La(1) and two equivalent La(3) atoms. In the fourth Br site, Br(4) is bonded in a distorted T-shaped geometry to one La(1), one La(2), and one La(3) atom. In the fifth Br site, Br(5) is bonded to one La(2), one La(3), and two equivalent La(1) atoms to form distorted BrLa4 tetrahedra that share  a cornercorner with one C(1)La4 tetrahedra,  a cornercorner with one Br(6)La4 tetrahedra, corners with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Br(5)La4 tetrahedra,  an edgeedge with one Br(6)La4 tetrahedra, and edges with two equivalent C(1)La4 tetrahedra. In the sixth Br site, Br(6) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form BrLa4 tetrahedra that share corners with two equivalent Br(5)La4 tetrahedra, corners with four equivalent C(1)La4 tetrahedra,  an edgeedge with one Br(1)La4 tetrahedra, and edges with two equivalent Br(5)La4 tetrahedra. In the seventh Br site, Br(7) is bonded in a distorted rectangular see-saw-like geometry to two equivalent La(2) and two equivalent La(3) atoms. is represented by the CIF file [CIF]
data_La3CBr5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.011
_cell_length_b   9.011
_cell_length_c   14.639
_cell_angle_alpha   76.754
_cell_angle_beta   76.754
_cell_angle_gamma   74.901
_symmetry_Int_Tables_number   1
_cell_volume   1098.835
_cell_formula_units_Z   4
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
  La  La0  1  0.619  0.661  0.594  1.0
  La  La1  1  0.990  0.712  0.675  1.0
  La  La2  1  0.320  0.985  0.087  1.0
  La  La3  1  0.010  0.288  0.325  1.0
  La  La4  1  0.680  0.015  0.913  1.0
  La  La5  1  0.015  0.680  0.413  1.0
  La  La6  1  0.985  0.320  0.587  1.0
  La  La7  1  0.712  0.990  0.175  1.0
  La  La8  1  0.381  0.339  0.406  1.0
  La  La9  1  0.661  0.619  0.094  1.0
  La  La10  1  0.339  0.381  0.906  1.0
  La  La11  1  0.288  0.010  0.825  1.0
  C  C12  1  0.112  0.395  0.421  1.0
  C  C13  1  0.888  0.605  0.579  1.0
  C  C14  1  0.395  0.112  0.921  1.0
  C  C15  1  0.605  0.888  0.079  1.0
  Br  Br16  1  0.977  0.023  0.750  1.0
  Br  Br17  1  0.883  0.637  0.228  1.0
  Br  Br18  1  0.637  0.883  0.728  1.0
  Br  Br19  1  0.358  0.642  0.250  1.0
  Br  Br20  1  0.663  0.879  0.407  1.0
  Br  Br21  1  0.382  0.700  0.981  1.0
  Br  Br22  1  0.697  0.303  0.250  1.0
  Br  Br23  1  0.300  0.618  0.519  1.0
  Br  Br24  1  0.642  0.358  0.750  1.0
  Br  Br25  1  0.121  0.337  0.093  1.0
  Br  Br26  1  0.303  0.697  0.750  1.0
  Br  Br27  1  0.879  0.663  0.907  1.0
  Br  Br28  1  0.363  0.117  0.272  1.0
  Br  Br29  1  0.000  0.000  0.000  1.0
  Br  Br30  1  0.023  0.977  0.250  1.0
  Br  Br31  1  0.618  0.300  0.019  1.0
  Br  Br32  1  0.337  0.121  0.593  1.0
  Br  Br33  1  0.700  0.382  0.481  1.0
  Br  Br34  1  0.117  0.363  0.772  1.0
  Br  Br35  1  0.000  0.000  0.500  1.0
[/CIF]
.
The structure described by La3CBr5 crystallizes in the monoclinic C2/c space group. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one C(1), one Br(2), one Br(3), one Br(4), one Br(6), and two equivalent Br(5) atoms. In the second La site, La(2) is bonded in a 8-coordinate geometry to one C(1), one Br(1), one Br(4), one Br(5), one Br(6), one Br(7), and two equivalent Br(2) atoms. In the third La site, La(3) is bonded in a 8-coordinate geometry to two equivalent C(1), one Br(1), one Br(2), one Br(3), one Br(4), one Br(5), and one Br(7) atom. C(1) is bonded to one La(1), one La(2), and two equivalent La(3) atoms to form CLa4 tetrahedra that share  a cornercorner with one Br(5)La4 tetrahedra, corners with two equivalent Br(6)La4 tetrahedra, corners with three equivalent Br(1)La4 tetrahedra,  an edgeedge with one C(1)La4 tetrahedra, and edges with two equivalent Br(5)La4 tetrahedra. There are seven inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent La(2) and two equivalent La(3) atoms to form BrLa4 tetrahedra that share corners with four equivalent Br(5)La4 tetrahedra, corners with six equivalent C(1)La4 tetrahedra, and  an edgeedge with one Br(6)La4 tetrahedra. In the second Br site, Br(2) is bonded in a rectangular see-saw-like geometry to one La(1), one La(3), and two equivalent La(2) atoms. In the third Br site, Br(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent La(1) and two equivalent La(3) atoms. In the fourth Br site, Br(4) is bonded in a distorted T-shaped geometry to one La(1), one La(2), and one La(3) atom. In the fifth Br site, Br(5) is bonded to one La(2), one La(3), and two equivalent La(1) atoms to form distorted BrLa4 tetrahedra that share  a cornercorner with one C(1)La4 tetrahedra,  a cornercorner with one Br(6)La4 tetrahedra, corners with two equivalent Br(1)La4 tetrahedra,  an edgeedge with one Br(5)La4 tetrahedra,  an edgeedge with one Br(6)La4 tetrahedra, and edges with two equivalent C(1)La4 tetrahedra. In the sixth Br site, Br(6) is bonded to two equivalent La(1) and two equivalent La(2) atoms to form BrLa4 tetrahedra that share corners with two equivalent Br(5)La4 tetrahedra, corners with four equivalent C(1)La4 tetrahedra,  an edgeedge with one Br(1)La4 tetrahedra, and edges with two equivalent Br(5)La4 tetrahedra. In the seventh Br site, Br(7) is bonded in a distorted rectangular see-saw-like geometry to two equivalent La(2) and two equivalent La(3) atoms. is represented by the CIF file [CIF]
data_La3CBr5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.011
_cell_length_b   9.011
_cell_length_c   14.639
_cell_angle_alpha   76.754
_cell_angle_beta   76.754
_cell_angle_gamma   74.901
_symmetry_Int_Tables_number   1
_cell_volume   1098.835
_cell_formula_units_Z   4
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
  La  La0  1  0.619  0.661  0.594  1.0
  La  La1  1  0.990  0.712  0.675  1.0
  La  La2  1  0.320  0.985  0.087  1.0
  La  La3  1  0.010  0.288  0.325  1.0
  La  La4  1  0.680  0.015  0.913  1.0
  La  La5  1  0.015  0.680  0.413  1.0
  La  La6  1  0.985  0.320  0.587  1.0
  La  La7  1  0.712  0.990  0.175  1.0
  La  La8  1  0.381  0.339  0.406  1.0
  La  La9  1  0.661  0.619  0.094  1.0
  La  La10  1  0.339  0.381  0.906  1.0
  La  La11  1  0.288  0.010  0.825  1.0
  C  C12  1  0.112  0.395  0.421  1.0
  C  C13  1  0.888  0.605  0.579  1.0
  C  C14  1  0.395  0.112  0.921  1.0
  C  C15  1  0.605  0.888  0.079  1.0
  Br  Br16  1  0.977  0.023  0.750  1.0
  Br  Br17  1  0.883  0.637  0.228  1.0
  Br  Br18  1  0.637  0.883  0.728  1.0
  Br  Br19  1  0.358  0.642  0.250  1.0
  Br  Br20  1  0.663  0.879  0.407  1.0
  Br  Br21  1  0.382  0.700  0.981  1.0
  Br  Br22  1  0.697  0.303  0.250  1.0
  Br  Br23  1  0.300  0.618  0.519  1.0
  Br  Br24  1  0.642  0.358  0.750  1.0
  Br  Br25  1  0.121  0.337  0.093  1.0
  Br  Br26  1  0.303  0.697  0.750  1.0
  Br  Br27  1  0.879  0.663  0.907  1.0
  Br  Br28  1  0.363  0.117  0.272  1.0
  Br  Br29  1  0.000  0.000  0.000  1.0
  Br  Br30  1  0.023  0.977  0.250  1.0
  Br  Br31  1  0.618  0.300  0.019  1.0
  Br  Br32  1  0.337  0.121  0.593  1.0
  Br  Br33  1  0.700  0.382  0.481  1.0
  Br  Br34  1  0.117  0.363  0.772  1.0
  Br  Br35  1  0.000  0.000  0.500  1.0
[/CIF]
.