The structure described by La20Os12C13 crystallizes in the monoclinic P2/m space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 5-coordinate geometry to two equivalent Os(3), one C(2), one C(5), and one C(7) atom. In the second La site, La(2) is bonded in a 4-coordinate geometry to two equivalent Os(4), one C(1), and one C(4) atom. In the third La site, La(3) is bonded in a 4-coordinate geometry to one Os(2), one Os(4), one C(3), and one C(6) atom. In the fourth La site, La(4) is bonded in a 5-coordinate geometry to one Os(1), one Os(3), one C(3), one C(6), and one C(7) atom. In the fifth La site, La(5) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. In the sixth La site, La(6) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(3) atoms. In the seventh La site, La(7) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(6) atoms. In the eighth La site, La(8) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(6) atoms. There are four inequivalent Os sites. In the first Os site, Os(1) is bonded in a distorted bent 120 degrees geometry to two equivalent La(4), one C(2), and one C(5) atom. In the second Os site, Os(2) is bonded in a distorted bent 120 degrees geometry to two equivalent La(3), one C(1), and one C(4) atom. In the third Os site, Os(3) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(4), one C(3), and one C(6) atom. In the fourth Os site, Os(4) is bonded in a distorted bent 120 degrees geometry to one La(2), one La(3), one C(3), and one C(6) atom. There are seven inequivalent C sites. In the first C site, C(1) is bonded to two equivalent La(2), two equivalent La(5), and two equivalent Os(2) atoms to form a mixture of corner and edge-sharing CLa4Os2 octahedra. The corner-sharing octahedral tilt angles are 60°. In the second C site, C(2) is bonded to two equivalent La(1), two equivalent La(6), and two equivalent Os(1) atoms to form CLa4Os2 octahedra that share corners with two equivalent C(7)La6 octahedra, corners with four equivalent C(3)La4Os2 octahedra, and edges with two equivalent C(5)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 60-70°. In the third C site, C(3) is bonded to one La(3), one La(4), one La(5), one La(6), one Os(3), and one Os(4) atom to form CLa4Os2 octahedra that share  a cornercorner with one C(1)La4Os2 octahedra,  a cornercorner with one C(2)La4Os2 octahedra,  a cornercorner with one C(7)La6 octahedra, corners with two equivalent C(3)La4Os2 octahedra, and edges with two equivalent C(6)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 60-69°. In the fourth C site, C(4) is bonded to two equivalent La(2), two equivalent La(8), and two equivalent Os(2) atoms to form a mixture of corner and edge-sharing CLa4Os2 octahedra. The corner-sharing octahedral tilt angles are 60°. In the fifth C site, C(5) is bonded to two equivalent La(1), two equivalent La(7), and two equivalent Os(1) atoms to form CLa4Os2 octahedra that share corners with two equivalent C(7)La6 octahedra, corners with four equivalent C(6)La4Os2 octahedra, and edges with two equivalent C(2)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 1-60°. In the sixth C site, C(6) is bonded to one La(3), one La(4), one La(7), one La(8), one Os(3), and one Os(4) atom to form CLa4Os2 octahedra that share  a cornercorner with one C(4)La4Os2 octahedra,  a cornercorner with one C(5)La4Os2 octahedra,  a cornercorner with one C(7)La6 octahedra, corners with two equivalent C(6)La4Os2 octahedra, and edges with two equivalent C(3)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the seventh C site, C(7) is bonded to two equivalent La(1) and four equivalent La(4) atoms to form corner-sharing CLa6 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. is represented by the Crystallographic Information File (CIF) [CIF]
data_La20Os12C13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.968
_cell_length_b   6.806
_cell_length_c   9.181
_cell_angle_alpha   89.930
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   997.758
_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
  La  La0  1  0.000  0.766  0.739  1.0
  La  La1  1  0.500  0.749  0.252  1.0
  La  La2  1  0.374  0.749  0.875  1.0
  La  La3  1  0.881  0.765  0.381  1.0
  La  La4  1  0.119  0.765  0.381  1.0
  La  La5  1  0.626  0.749  0.875  1.0
  La  La6  1  0.000  0.234  0.261  1.0
  La  La7  1  0.500  0.251  0.748  1.0
  La  La8  1  0.119  0.235  0.619  1.0
  La  La9  1  0.626  0.251  0.125  1.0
  La  La10  1  0.374  0.251  0.125  1.0
  La  La11  1  0.881  0.235  0.619  1.0
  La  La12  1  0.334  0.000  0.500  1.0
  La  La13  1  0.834  0.000  0.000  1.0
  La  La14  1  0.166  0.000  0.000  1.0
  La  La15  1  0.666  0.000  0.500  1.0
  La  La16  1  0.166  0.500  0.000  1.0
  La  La17  1  0.667  0.500  0.500  1.0
  La  La18  1  0.333  0.500  0.500  1.0
  La  La19  1  0.834  0.500  0.000  1.0
  Os  Os20  1  0.000  0.749  0.096  1.0
  Os  Os21  1  0.500  0.750  0.599  1.0
  Os  Os22  1  0.203  0.749  0.702  1.0
  Os  Os23  1  0.700  0.750  0.200  1.0
  Os  Os24  1  0.300  0.750  0.200  1.0
  Os  Os25  1  0.797  0.749  0.702  1.0
  Os  Os26  1  0.000  0.251  0.904  1.0
  Os  Os27  1  0.500  0.250  0.401  1.0
  Os  Os28  1  0.300  0.250  0.800  1.0
  Os  Os29  1  0.797  0.251  0.298  1.0
  Os  Os30  1  0.203  0.251  0.298  1.0
  Os  Os31  1  0.700  0.250  0.800  1.0
  C  C32  1  0.500  0.000  0.500  1.0
  C  C33  1  0.000  0.000  0.000  1.0
  C  C34  1  0.250  0.002  0.750  1.0
  C  C35  1  0.750  0.998  0.250  1.0
  C  C36  1  0.250  0.998  0.250  1.0
  C  C37  1  0.750  0.002  0.750  1.0
  C  C38  1  0.500  0.500  0.500  1.0
  C  C39  1  0.000  0.500  0.000  1.0
  C  C40  1  0.250  0.499  0.751  1.0
  C  C41  1  0.750  0.501  0.249  1.0
  C  C42  1  0.250  0.501  0.249  1.0
  C  C43  1  0.750  0.499  0.751  1.0
  C  C44  1  0.000  0.000  0.500  1.0
[/CIF]
.
The structure described by La20Os12C13 crystallizes in the monoclinic P2/m space group. There are eight inequivalent La sites. In the first La site, La(1) is bonded in a 5-coordinate geometry to two equivalent Os(3), one C(2), one C(5), and one C(7) atom. In the second La site, La(2) is bonded in a 4-coordinate geometry to two equivalent Os(4), one C(1), and one C(4) atom. In the third La site, La(3) is bonded in a 4-coordinate geometry to one Os(2), one Os(4), one C(3), and one C(6) atom. In the fourth La site, La(4) is bonded in a 5-coordinate geometry to one Os(1), one Os(3), one C(3), one C(6), and one C(7) atom. In the fifth La site, La(5) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. In the sixth La site, La(6) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(3) atoms. In the seventh La site, La(7) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(6) atoms. In the eighth La site, La(8) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(6) atoms. There are four inequivalent Os sites. In the first Os site, Os(1) is bonded in a distorted bent 120 degrees geometry to two equivalent La(4), one C(2), and one C(5) atom. In the second Os site, Os(2) is bonded in a distorted bent 120 degrees geometry to two equivalent La(3), one C(1), and one C(4) atom. In the third Os site, Os(3) is bonded in a distorted bent 120 degrees geometry to one La(1), one La(4), one C(3), and one C(6) atom. In the fourth Os site, Os(4) is bonded in a distorted bent 120 degrees geometry to one La(2), one La(3), one C(3), and one C(6) atom. There are seven inequivalent C sites. In the first C site, C(1) is bonded to two equivalent La(2), two equivalent La(5), and two equivalent Os(2) atoms to form a mixture of corner and edge-sharing CLa4Os2 octahedra. The corner-sharing octahedral tilt angles are 60°. In the second C site, C(2) is bonded to two equivalent La(1), two equivalent La(6), and two equivalent Os(1) atoms to form CLa4Os2 octahedra that share corners with two equivalent C(7)La6 octahedra, corners with four equivalent C(3)La4Os2 octahedra, and edges with two equivalent C(5)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 60-70°. In the third C site, C(3) is bonded to one La(3), one La(4), one La(5), one La(6), one Os(3), and one Os(4) atom to form CLa4Os2 octahedra that share  a cornercorner with one C(1)La4Os2 octahedra,  a cornercorner with one C(2)La4Os2 octahedra,  a cornercorner with one C(7)La6 octahedra, corners with two equivalent C(3)La4Os2 octahedra, and edges with two equivalent C(6)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 60-69°. In the fourth C site, C(4) is bonded to two equivalent La(2), two equivalent La(8), and two equivalent Os(2) atoms to form a mixture of corner and edge-sharing CLa4Os2 octahedra. The corner-sharing octahedral tilt angles are 60°. In the fifth C site, C(5) is bonded to two equivalent La(1), two equivalent La(7), and two equivalent Os(1) atoms to form CLa4Os2 octahedra that share corners with two equivalent C(7)La6 octahedra, corners with four equivalent C(6)La4Os2 octahedra, and edges with two equivalent C(2)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 1-60°. In the sixth C site, C(6) is bonded to one La(3), one La(4), one La(7), one La(8), one Os(3), and one Os(4) atom to form CLa4Os2 octahedra that share  a cornercorner with one C(4)La4Os2 octahedra,  a cornercorner with one C(5)La4Os2 octahedra,  a cornercorner with one C(7)La6 octahedra, corners with two equivalent C(6)La4Os2 octahedra, and edges with two equivalent C(3)La4Os2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the seventh C site, C(7) is bonded to two equivalent La(1) and four equivalent La(4) atoms to form corner-sharing CLa6 octahedra. The corner-sharing octahedral tilt angles range from 1-70°. is represented by the Crystallographic Information File (CIF) [CIF]
data_La20Os12C13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   15.968
_cell_length_b   6.806
_cell_length_c   9.181
_cell_angle_alpha   89.930
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   997.758
_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
  La  La0  1  0.000  0.766  0.739  1.0
  La  La1  1  0.500  0.749  0.252  1.0
  La  La2  1  0.374  0.749  0.875  1.0
  La  La3  1  0.881  0.765  0.381  1.0
  La  La4  1  0.119  0.765  0.381  1.0
  La  La5  1  0.626  0.749  0.875  1.0
  La  La6  1  0.000  0.234  0.261  1.0
  La  La7  1  0.500  0.251  0.748  1.0
  La  La8  1  0.119  0.235  0.619  1.0
  La  La9  1  0.626  0.251  0.125  1.0
  La  La10  1  0.374  0.251  0.125  1.0
  La  La11  1  0.881  0.235  0.619  1.0
  La  La12  1  0.334  0.000  0.500  1.0
  La  La13  1  0.834  0.000  0.000  1.0
  La  La14  1  0.166  0.000  0.000  1.0
  La  La15  1  0.666  0.000  0.500  1.0
  La  La16  1  0.166  0.500  0.000  1.0
  La  La17  1  0.667  0.500  0.500  1.0
  La  La18  1  0.333  0.500  0.500  1.0
  La  La19  1  0.834  0.500  0.000  1.0
  Os  Os20  1  0.000  0.749  0.096  1.0
  Os  Os21  1  0.500  0.750  0.599  1.0
  Os  Os22  1  0.203  0.749  0.702  1.0
  Os  Os23  1  0.700  0.750  0.200  1.0
  Os  Os24  1  0.300  0.750  0.200  1.0
  Os  Os25  1  0.797  0.749  0.702  1.0
  Os  Os26  1  0.000  0.251  0.904  1.0
  Os  Os27  1  0.500  0.250  0.401  1.0
  Os  Os28  1  0.300  0.250  0.800  1.0
  Os  Os29  1  0.797  0.251  0.298  1.0
  Os  Os30  1  0.203  0.251  0.298  1.0
  Os  Os31  1  0.700  0.250  0.800  1.0
  C  C32  1  0.500  0.000  0.500  1.0
  C  C33  1  0.000  0.000  0.000  1.0
  C  C34  1  0.250  0.002  0.750  1.0
  C  C35  1  0.750  0.998  0.250  1.0
  C  C36  1  0.250  0.998  0.250  1.0
  C  C37  1  0.750  0.002  0.750  1.0
  C  C38  1  0.500  0.500  0.500  1.0
  C  C39  1  0.000  0.500  0.000  1.0
  C  C40  1  0.250  0.499  0.751  1.0
  C  C41  1  0.750  0.501  0.249  1.0
  C  C42  1  0.250  0.501  0.249  1.0
  C  C43  1  0.750  0.499  0.751  1.0
  C  C44  1  0.000  0.000  0.500  1.0
[/CIF]
.