The compound described by Er7Ru2C11 crystallizes in the orthorhombic Cmcm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent C(1), two equivalent C(2), and two equivalent C(5) atoms to form ErC6 octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with two equivalent C(7)Er4RuC octahedra, and edges with two equivalent Er(1)C6 octahedra. The corner-sharing octahedral tilt angles range from 41-58°. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one C(1), two equivalent C(6), and two equivalent C(7) atoms. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to two equivalent C(6), two equivalent C(7), and three equivalent C(4) atoms. In the fourth Er site, Er(4) is bonded in a 9-coordinate geometry to one C(5), two equivalent C(2), two equivalent C(3), two equivalent C(4), and two equivalent C(6) atoms. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a distorted linear geometry to two equivalent C(6) and two equivalent C(7) atoms. In the second Ru site, Ru(2) is bonded in a distorted trigonal planar geometry to one C(3) and two equivalent C(1) atoms. There are seven inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Er(1), two equivalent Er(2), and two equivalent Ru(2) atoms to form CEr4Ru2 octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with four equivalent C(7)Er4RuC octahedra, and edges with two equivalent C(1)Er4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 52-74°. In the second C site, C(2) is bonded in a 7-coordinate geometry to two equivalent Er(1), four equivalent Er(4), and one C(3) atom. In the third C site, C(3) is bonded to four equivalent Er(4), one Ru(2), and one C(2) atom to form distorted CEr4RuC octahedra that share corners with two equivalent Er(1)C6 octahedra, corners with two equivalent C(1)Er4Ru2 octahedra, corners with four equivalent C(4)Er5C octahedra, edges with two equivalent C(3)Er4RuC octahedra, and edges with two equivalent C(4)Er5C octahedra. The corner-sharing octahedral tilt angles range from 15-52°. In the fourth C site, C(4) is bonded to two equivalent Er(4), three equivalent Er(3), and one C(6) atom to form CEr5C octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with four equivalent C(7)Er4RuC octahedra,  an edgeedge with one C(3)Er4RuC octahedra,  an edgeedge with one C(7)Er4RuC octahedra, and edges with four equivalent C(4)Er5C octahedra. The corner-sharing octahedral tilt angles range from 15-70°. In the fifth C site, C(5) is bonded in a 3-coordinate geometry to one Er(1), one Er(4), and one C(7) atom. In the sixth C site, C(6) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(3), two equivalent Er(4), one Ru(1), and one C(4) atom. In the seventh C site, C(7) is bonded to two equivalent Er(2), two equivalent Er(3), one Ru(1), and one C(5) atom to form CEr4RuC octahedra that share  a cornercorner with one Er(1)C6 octahedra,  a cornercorner with one C(7)Er4RuC octahedra, corners with two equivalent C(1)Er4Ru2 octahedra, corners with four equivalent C(4)Er5C octahedra,  an edgeedge with one C(4)Er5C octahedra, and edges with two equivalent C(7)Er4RuC octahedra. The corner-sharing octahedral tilt angles range from 0-74°. is represented by the CIF card [CIF]
data_Er7Ru2C11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.409
_cell_length_b   8.409
_cell_length_c   19.732
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.635
_symmetry_Int_Tables_number   1
_cell_volume   553.419
_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
  Er  Er0  1  0.896  0.104  0.250  1.0
  Er  Er1  1  0.104  0.896  0.750  1.0
  Er  Er2  1  0.478  0.522  0.627  1.0
  Er  Er3  1  0.522  0.478  0.373  1.0
  Er  Er4  1  0.522  0.478  0.127  1.0
  Er  Er5  1  0.478  0.522  0.873  1.0
  Er  Er6  1  0.662  0.338  0.519  1.0
  Er  Er7  1  0.338  0.662  0.481  1.0
  Er  Er8  1  0.338  0.662  0.019  1.0
  Er  Er9  1  0.662  0.338  0.981  1.0
  Er  Er10  1  0.721  0.279  0.155  1.0
  Er  Er11  1  0.279  0.721  0.845  1.0
  Er  Er12  1  0.279  0.721  0.655  1.0
  Er  Er13  1  0.721  0.279  0.345  1.0
  Ru  Ru14  1  0.000  0.000  0.500  1.0
  Ru  Ru15  1  0.000  0.000  0.000  1.0
  Ru  Ru16  1  0.080  0.920  0.250  1.0
  Ru  Ru17  1  0.920  0.080  0.750  1.0
  C  C18  1  0.500  0.500  0.250  1.0
  C  C19  1  0.500  0.500  0.750  1.0
  C  C20  1  0.278  0.722  0.250  1.0
  C  C21  1  0.722  0.278  0.750  1.0
  C  C22  1  0.197  0.803  0.250  1.0
  C  C23  1  0.803  0.197  0.750  1.0
  C  C24  1  0.794  0.206  0.564  1.0
  C  C25  1  0.206  0.794  0.436  1.0
  C  C26  1  0.206  0.794  0.064  1.0
  C  C27  1  0.794  0.206  0.936  1.0
  C  C28  1  0.867  0.133  0.124  1.0
  C  C29  1  0.133  0.867  0.876  1.0
  C  C30  1  0.133  0.867  0.624  1.0
  C  C31  1  0.867  0.133  0.376  1.0
  C  C32  1  0.873  0.127  0.585  1.0
  C  C33  1  0.127  0.873  0.415  1.0
  C  C34  1  0.127  0.873  0.085  1.0
  C  C35  1  0.873  0.127  0.915  1.0
  C  C36  1  0.925  0.075  0.421  1.0
  C  C37  1  0.075  0.925  0.579  1.0
  C  C38  1  0.075  0.925  0.921  1.0
  C  C39  1  0.925  0.075  0.079  1.0
[/CIF]
.
The compound described by Er7Ru2C11 crystallizes in the orthorhombic Cmcm space group. There are four inequivalent Er sites. In the first Er site, Er(1) is bonded to two equivalent C(1), two equivalent C(2), and two equivalent C(5) atoms to form ErC6 octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with two equivalent C(7)Er4RuC octahedra, and edges with two equivalent Er(1)C6 octahedra. The corner-sharing octahedral tilt angles range from 41-58°. In the second Er site, Er(2) is bonded in a 5-coordinate geometry to one C(1), two equivalent C(6), and two equivalent C(7) atoms. In the third Er site, Er(3) is bonded in a 5-coordinate geometry to two equivalent C(6), two equivalent C(7), and three equivalent C(4) atoms. In the fourth Er site, Er(4) is bonded in a 9-coordinate geometry to one C(5), two equivalent C(2), two equivalent C(3), two equivalent C(4), and two equivalent C(6) atoms. There are two inequivalent Ru sites. In the first Ru site, Ru(1) is bonded in a distorted linear geometry to two equivalent C(6) and two equivalent C(7) atoms. In the second Ru site, Ru(2) is bonded in a distorted trigonal planar geometry to one C(3) and two equivalent C(1) atoms. There are seven inequivalent C sites. In the first C site, C(1) is bonded to two equivalent Er(1), two equivalent Er(2), and two equivalent Ru(2) atoms to form CEr4Ru2 octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with four equivalent C(7)Er4RuC octahedra, and edges with two equivalent C(1)Er4Ru2 octahedra. The corner-sharing octahedral tilt angles range from 52-74°. In the second C site, C(2) is bonded in a 7-coordinate geometry to two equivalent Er(1), four equivalent Er(4), and one C(3) atom. In the third C site, C(3) is bonded to four equivalent Er(4), one Ru(2), and one C(2) atom to form distorted CEr4RuC octahedra that share corners with two equivalent Er(1)C6 octahedra, corners with two equivalent C(1)Er4Ru2 octahedra, corners with four equivalent C(4)Er5C octahedra, edges with two equivalent C(3)Er4RuC octahedra, and edges with two equivalent C(4)Er5C octahedra. The corner-sharing octahedral tilt angles range from 15-52°. In the fourth C site, C(4) is bonded to two equivalent Er(4), three equivalent Er(3), and one C(6) atom to form CEr5C octahedra that share corners with two equivalent C(3)Er4RuC octahedra, corners with four equivalent C(7)Er4RuC octahedra,  an edgeedge with one C(3)Er4RuC octahedra,  an edgeedge with one C(7)Er4RuC octahedra, and edges with four equivalent C(4)Er5C octahedra. The corner-sharing octahedral tilt angles range from 15-70°. In the fifth C site, C(5) is bonded in a 3-coordinate geometry to one Er(1), one Er(4), and one C(7) atom. In the sixth C site, C(6) is bonded in a 8-coordinate geometry to two equivalent Er(2), two equivalent Er(3), two equivalent Er(4), one Ru(1), and one C(4) atom. In the seventh C site, C(7) is bonded to two equivalent Er(2), two equivalent Er(3), one Ru(1), and one C(5) atom to form CEr4RuC octahedra that share  a cornercorner with one Er(1)C6 octahedra,  a cornercorner with one C(7)Er4RuC octahedra, corners with two equivalent C(1)Er4Ru2 octahedra, corners with four equivalent C(4)Er5C octahedra,  an edgeedge with one C(4)Er5C octahedra, and edges with two equivalent C(7)Er4RuC octahedra. The corner-sharing octahedral tilt angles range from 0-74°. is represented by the CIF card [CIF]
data_Er7Ru2C11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.409
_cell_length_b   8.409
_cell_length_c   19.732
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   156.635
_symmetry_Int_Tables_number   1
_cell_volume   553.419
_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
  Er  Er0  1  0.896  0.104  0.250  1.0
  Er  Er1  1  0.104  0.896  0.750  1.0
  Er  Er2  1  0.478  0.522  0.627  1.0
  Er  Er3  1  0.522  0.478  0.373  1.0
  Er  Er4  1  0.522  0.478  0.127  1.0
  Er  Er5  1  0.478  0.522  0.873  1.0
  Er  Er6  1  0.662  0.338  0.519  1.0
  Er  Er7  1  0.338  0.662  0.481  1.0
  Er  Er8  1  0.338  0.662  0.019  1.0
  Er  Er9  1  0.662  0.338  0.981  1.0
  Er  Er10  1  0.721  0.279  0.155  1.0
  Er  Er11  1  0.279  0.721  0.845  1.0
  Er  Er12  1  0.279  0.721  0.655  1.0
  Er  Er13  1  0.721  0.279  0.345  1.0
  Ru  Ru14  1  0.000  0.000  0.500  1.0
  Ru  Ru15  1  0.000  0.000  0.000  1.0
  Ru  Ru16  1  0.080  0.920  0.250  1.0
  Ru  Ru17  1  0.920  0.080  0.750  1.0
  C  C18  1  0.500  0.500  0.250  1.0
  C  C19  1  0.500  0.500  0.750  1.0
  C  C20  1  0.278  0.722  0.250  1.0
  C  C21  1  0.722  0.278  0.750  1.0
  C  C22  1  0.197  0.803  0.250  1.0
  C  C23  1  0.803  0.197  0.750  1.0
  C  C24  1  0.794  0.206  0.564  1.0
  C  C25  1  0.206  0.794  0.436  1.0
  C  C26  1  0.206  0.794  0.064  1.0
  C  C27  1  0.794  0.206  0.936  1.0
  C  C28  1  0.867  0.133  0.124  1.0
  C  C29  1  0.133  0.867  0.876  1.0
  C  C30  1  0.133  0.867  0.624  1.0
  C  C31  1  0.867  0.133  0.376  1.0
  C  C32  1  0.873  0.127  0.585  1.0
  C  C33  1  0.127  0.873  0.415  1.0
  C  C34  1  0.127  0.873  0.085  1.0
  C  C35  1  0.873  0.127  0.915  1.0
  C  C36  1  0.925  0.075  0.421  1.0
  C  C37  1  0.075  0.925  0.579  1.0
  C  C38  1  0.075  0.925  0.921  1.0
  C  C39  1  0.925  0.075  0.079  1.0
[/CIF]
.