The compound described by IrC4 crystallizes in the orthorhombic Pbca space group. Ir(1) is bonded in a 6-coordinate geometry to one C(1), one C(2), two equivalent C(3), and two equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Ir(1), one C(1), and one C(3) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, corners with four equivalent C(3)Ir2C2 tetrahedra, and corners with five equivalent C(2)IrC3 tetrahedra. In the second C site, C(1) is bonded to one Ir(1), one C(4), and two equivalent C(2) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(2)IrC3 tetrahedra, corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, and corners with five equivalent C(3)Ir2C2 tetrahedra. In the third C site, C(2) is bonded to one Ir(1), one C(3), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(1)IrC3 tetrahedra, corners with two equivalent C(3)Ir2C2 tetrahedra, corners with two equivalent C(2)IrC3 tetrahedra, and corners with five equivalent C(4)Ir2C2 tetrahedra. In the fourth C site, C(3) is bonded to two equivalent Ir(1), one C(2), and one C(4) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(2)IrC3 tetrahedra, corners with four equivalent C(4)Ir2C2 tetrahedra, corners with five equivalent C(1)IrC3 tetrahedra, and  an edgeedge with one C(3)Ir2C2 tetrahedra. is represented by the CIF file [CIF]
data_IrC4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.898
_cell_length_b   9.194
_cell_length_c   7.462
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   336.069
_cell_formula_units_Z   8
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
  Ir  Ir0  1  0.374  0.566  0.870  1.0
  Ir  Ir1  1  0.874  0.434  0.630  1.0
  Ir  Ir2  1  0.626  0.934  0.370  1.0
  Ir  Ir3  1  0.126  0.066  0.130  1.0
  Ir  Ir4  1  0.626  0.434  0.130  1.0
  Ir  Ir5  1  0.126  0.566  0.370  1.0
  Ir  Ir6  1  0.374  0.066  0.630  1.0
  Ir  Ir7  1  0.874  0.934  0.870  1.0
  C  C8  1  0.446  0.749  0.693  1.0
  C  C9  1  0.946  0.251  0.807  1.0
  C  C10  1  0.554  0.751  0.193  1.0
  C  C11  1  0.054  0.249  0.307  1.0
  C  C12  1  0.554  0.251  0.307  1.0
  C  C13  1  0.054  0.749  0.193  1.0
  C  C14  1  0.446  0.249  0.807  1.0
  C  C15  1  0.946  0.751  0.693  1.0
  C  C16  1  0.304  0.761  0.081  1.0
  C  C17  1  0.804  0.239  0.419  1.0
  C  C18  1  0.696  0.739  0.581  1.0
  C  C19  1  0.196  0.261  0.919  1.0
  C  C20  1  0.696  0.239  0.919  1.0
  C  C21  1  0.196  0.761  0.581  1.0
  C  C22  1  0.304  0.261  0.419  1.0
  C  C23  1  0.804  0.739  0.081  1.0
  C  C24  1  0.772  0.615  0.958  1.0
  C  C25  1  0.272  0.385  0.542  1.0
  C  C26  1  0.228  0.885  0.458  1.0
  C  C27  1  0.728  0.115  0.042  1.0
  C  C28  1  0.228  0.385  0.042  1.0
  C  C29  1  0.728  0.615  0.458  1.0
  C  C30  1  0.772  0.115  0.542  1.0
  C  C31  1  0.272  0.885  0.958  1.0
  C  C32  1  0.969  0.617  0.810  1.0
  C  C33  1  0.469  0.383  0.690  1.0
  C  C34  1  0.031  0.883  0.310  1.0
  C  C35  1  0.531  0.117  0.190  1.0
  C  C36  1  0.031  0.383  0.190  1.0
  C  C37  1  0.531  0.617  0.310  1.0
  C  C38  1  0.969  0.117  0.690  1.0
  C  C39  1  0.469  0.883  0.810  1.0
[/CIF]
.
The compound described by IrC4 crystallizes in the orthorhombic Pbca space group. Ir(1) is bonded in a 6-coordinate geometry to one C(1), one C(2), two equivalent C(3), and two equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(4) is bonded to two equivalent Ir(1), one C(1), and one C(3) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, corners with four equivalent C(3)Ir2C2 tetrahedra, and corners with five equivalent C(2)IrC3 tetrahedra. In the second C site, C(1) is bonded to one Ir(1), one C(4), and two equivalent C(2) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(2)IrC3 tetrahedra, corners with two equivalent C(4)Ir2C2 tetrahedra, corners with two equivalent C(1)IrC3 tetrahedra, and corners with five equivalent C(3)Ir2C2 tetrahedra. In the third C site, C(2) is bonded to one Ir(1), one C(3), and two equivalent C(1) atoms to form CIrC3 tetrahedra that share  a cornercorner with one C(1)IrC3 tetrahedra, corners with two equivalent C(3)Ir2C2 tetrahedra, corners with two equivalent C(2)IrC3 tetrahedra, and corners with five equivalent C(4)Ir2C2 tetrahedra. In the fourth C site, C(3) is bonded to two equivalent Ir(1), one C(2), and one C(4) atom to form CIr2C2 tetrahedra that share corners with two equivalent C(2)IrC3 tetrahedra, corners with four equivalent C(4)Ir2C2 tetrahedra, corners with five equivalent C(1)IrC3 tetrahedra, and  an edgeedge with one C(3)Ir2C2 tetrahedra. is represented by the CIF file [CIF]
data_IrC4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.898
_cell_length_b   9.194
_cell_length_c   7.462
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   336.069
_cell_formula_units_Z   8
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
  Ir  Ir0  1  0.374  0.566  0.870  1.0
  Ir  Ir1  1  0.874  0.434  0.630  1.0
  Ir  Ir2  1  0.626  0.934  0.370  1.0
  Ir  Ir3  1  0.126  0.066  0.130  1.0
  Ir  Ir4  1  0.626  0.434  0.130  1.0
  Ir  Ir5  1  0.126  0.566  0.370  1.0
  Ir  Ir6  1  0.374  0.066  0.630  1.0
  Ir  Ir7  1  0.874  0.934  0.870  1.0
  C  C8  1  0.446  0.749  0.693  1.0
  C  C9  1  0.946  0.251  0.807  1.0
  C  C10  1  0.554  0.751  0.193  1.0
  C  C11  1  0.054  0.249  0.307  1.0
  C  C12  1  0.554  0.251  0.307  1.0
  C  C13  1  0.054  0.749  0.193  1.0
  C  C14  1  0.446  0.249  0.807  1.0
  C  C15  1  0.946  0.751  0.693  1.0
  C  C16  1  0.304  0.761  0.081  1.0
  C  C17  1  0.804  0.239  0.419  1.0
  C  C18  1  0.696  0.739  0.581  1.0
  C  C19  1  0.196  0.261  0.919  1.0
  C  C20  1  0.696  0.239  0.919  1.0
  C  C21  1  0.196  0.761  0.581  1.0
  C  C22  1  0.304  0.261  0.419  1.0
  C  C23  1  0.804  0.739  0.081  1.0
  C  C24  1  0.772  0.615  0.958  1.0
  C  C25  1  0.272  0.385  0.542  1.0
  C  C26  1  0.228  0.885  0.458  1.0
  C  C27  1  0.728  0.115  0.042  1.0
  C  C28  1  0.228  0.385  0.042  1.0
  C  C29  1  0.728  0.615  0.458  1.0
  C  C30  1  0.772  0.115  0.542  1.0
  C  C31  1  0.272  0.885  0.958  1.0
  C  C32  1  0.969  0.617  0.810  1.0
  C  C33  1  0.469  0.383  0.690  1.0
  C  C34  1  0.031  0.883  0.310  1.0
  C  C35  1  0.531  0.117  0.190  1.0
  C  C36  1  0.031  0.383  0.190  1.0
  C  C37  1  0.531  0.617  0.310  1.0
  C  C38  1  0.969  0.117  0.690  1.0
  C  C39  1  0.469  0.883  0.810  1.0
[/CIF]
.