The compound described by RbNb3CuCl9 crystallizes in the triclinic P-1 space group. Rb(1) is bonded to one Cl(2), one Cl(4), one Cl(5), one Cl(6), one Cl(8), one Cl(9), two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(7) atoms to form RbCl12 cuboctahedra that share corners with two equivalent Nb(2)Cl5 square pyramids, corners with three equivalent Nb(1)Cl5 square pyramids, corners with three equivalent Nb(3)Cl5 square pyramids, corners with three equivalent Cu(1)Cl4 tetrahedra,  an edgeedge with one Rb(1)Cl12 cuboctahedra,  an edgeedge with one Cu(1)Cl4 tetrahedra,  a faceface with one Rb(1)Cl12 cuboctahedra,  a faceface with one Nb(1)Cl5 square pyramid,  a faceface with one Nb(3)Cl5 square pyramid, and faces with two equivalent Nb(2)Cl5 square pyramids. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one Cl(4), one Cl(5), one Cl(6), one Cl(7), and one Cl(9) atom to form distorted NbCl5 square pyramids that share corners with three equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(2)Cl5 square pyramids, corners with two equivalent Nb(3)Cl5 square pyramids,  a cornercorner with one Cu(1)Cl4 tetrahedra, and  a faceface with one Rb(1)Cl12 cuboctahedra. In the second Nb site, Nb(2) is bonded to one Cl(1), one Cl(3), one Cl(6), one Cl(7), and one Cl(8) atom to form distorted NbCl5 square pyramids that share corners with two equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(1)Cl5 square pyramids, corners with two equivalent Nb(3)Cl5 square pyramids,  a cornercorner with one Cu(1)Cl4 tetrahedra, and faces with two equivalent Rb(1)Cl12 cuboctahedra. In the third Nb site, Nb(3) is bonded to one Cl(2), one Cl(3), one Cl(5), one Cl(8), and one Cl(9) atom to form distorted NbCl5 square pyramids that share corners with three equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(1)Cl5 square pyramids, corners with two equivalent Nb(2)Cl5 square pyramids, corners with two equivalent Cu(1)Cl4 tetrahedra, and  a faceface with one Rb(1)Cl12 cuboctahedra. Cu(1) is bonded to one Cl(1), one Cl(4), and two equivalent Cl(2) atoms to form distorted CuCl4 tetrahedra that share corners with three equivalent Rb(1)Cl12 cuboctahedra,  a cornercorner with one Nb(1)Cl5 square pyramid,  a cornercorner with one Nb(2)Cl5 square pyramid, corners with two equivalent Nb(3)Cl5 square pyramids,  an edgeedge with one Rb(1)Cl12 cuboctahedra, and  an edgeedge with one Cu(1)Cl4 tetrahedra. There are nine inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Nb(2), and one Cu(1) atom. In the second Cl site, Cl(2) is bonded in a 4-coordinate geometry to one Rb(1), one Nb(3), and two equivalent Cu(1) atoms. In the third Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Nb(2), and one Nb(3) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Cu(1) atom. In the fifth Cl site, Cl(5) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one Nb(3) atom. In the sixth Cl site, Cl(6) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one Nb(2) atom. In the seventh Cl site, Cl(7) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Nb(1), and one Nb(2) atom. In the eighth Cl site, Cl(8) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(2), and one Nb(3) atom. In the ninth Cl site, Cl(9) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Nb(3) atom. is represented by the CIF file [CIF]
data_RbNb3CuCl9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.456
_cell_length_b   9.475
_cell_length_c   9.471
_cell_angle_alpha   119.709
_cell_angle_beta   95.730
_cell_angle_gamma   105.577
_symmetry_Int_Tables_number   1
_cell_volume   681.813
_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
  Rb  Rb0  1  0.335  0.475  0.261  1.0
  Rb  Rb1  1  0.665  0.525  0.739  1.0
  Nb  Nb2  1  0.133  0.897  0.343  1.0
  Nb  Nb3  1  0.862  0.749  0.423  1.0
  Nb  Nb4  1  0.859  0.982  0.303  1.0
  Nb  Nb5  1  0.867  0.103  0.657  1.0
  Nb  Nb6  1  0.138  0.251  0.577  1.0
  Nb  Nb7  1  0.141  0.018  0.697  1.0
  Cu  Cu8  1  0.632  0.187  0.055  1.0
  Cu  Cu9  1  0.368  0.813  0.945  1.0
  Cl  Cl10  1  0.676  0.427  0.323  1.0
  Cl  Cl11  1  0.670  0.950  0.047  1.0
  Cl  Cl12  1  0.328  0.319  0.824  1.0
  Cl  Cl13  1  0.672  0.681  0.176  1.0
  Cl  Cl14  1  0.303  0.765  0.148  1.0
  Cl  Cl15  1  0.679  0.098  0.452  1.0
  Cl  Cl16  1  0.324  0.573  0.677  1.0
  Cl  Cl17  1  0.995  0.585  0.228  1.0
  Cl  Cl18  1  0.680  0.824  0.595  1.0
  Cl  Cl19  1  0.697  0.235  0.852  1.0
  Cl  Cl20  1  0.001  0.727  0.643  1.0
  Cl  Cl21  1  0.010  0.143  0.917  1.0
  Cl  Cl22  1  0.999  0.273  0.357  1.0
  Cl  Cl23  1  0.320  0.176  0.405  1.0
  Cl  Cl24  1  0.330  0.050  0.953  1.0
  Cl  Cl25  1  0.005  0.415  0.772  1.0
  Cl  Cl26  1  0.990  0.857  0.083  1.0
  Cl  Cl27  1  0.321  0.902  0.548  1.0
[/CIF]
.
The compound described by RbNb3CuCl9 crystallizes in the triclinic P-1 space group. Rb(1) is bonded to one Cl(2), one Cl(4), one Cl(5), one Cl(6), one Cl(8), one Cl(9), two equivalent Cl(1), two equivalent Cl(3), and two equivalent Cl(7) atoms to form RbCl12 cuboctahedra that share corners with two equivalent Nb(2)Cl5 square pyramids, corners with three equivalent Nb(1)Cl5 square pyramids, corners with three equivalent Nb(3)Cl5 square pyramids, corners with three equivalent Cu(1)Cl4 tetrahedra,  an edgeedge with one Rb(1)Cl12 cuboctahedra,  an edgeedge with one Cu(1)Cl4 tetrahedra,  a faceface with one Rb(1)Cl12 cuboctahedra,  a faceface with one Nb(1)Cl5 square pyramid,  a faceface with one Nb(3)Cl5 square pyramid, and faces with two equivalent Nb(2)Cl5 square pyramids. There are three inequivalent Nb sites. In the first Nb site, Nb(1) is bonded to one Cl(4), one Cl(5), one Cl(6), one Cl(7), and one Cl(9) atom to form distorted NbCl5 square pyramids that share corners with three equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(2)Cl5 square pyramids, corners with two equivalent Nb(3)Cl5 square pyramids,  a cornercorner with one Cu(1)Cl4 tetrahedra, and  a faceface with one Rb(1)Cl12 cuboctahedra. In the second Nb site, Nb(2) is bonded to one Cl(1), one Cl(3), one Cl(6), one Cl(7), and one Cl(8) atom to form distorted NbCl5 square pyramids that share corners with two equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(1)Cl5 square pyramids, corners with two equivalent Nb(3)Cl5 square pyramids,  a cornercorner with one Cu(1)Cl4 tetrahedra, and faces with two equivalent Rb(1)Cl12 cuboctahedra. In the third Nb site, Nb(3) is bonded to one Cl(2), one Cl(3), one Cl(5), one Cl(8), and one Cl(9) atom to form distorted NbCl5 square pyramids that share corners with three equivalent Rb(1)Cl12 cuboctahedra, corners with two equivalent Nb(1)Cl5 square pyramids, corners with two equivalent Nb(2)Cl5 square pyramids, corners with two equivalent Cu(1)Cl4 tetrahedra, and  a faceface with one Rb(1)Cl12 cuboctahedra. Cu(1) is bonded to one Cl(1), one Cl(4), and two equivalent Cl(2) atoms to form distorted CuCl4 tetrahedra that share corners with three equivalent Rb(1)Cl12 cuboctahedra,  a cornercorner with one Nb(1)Cl5 square pyramid,  a cornercorner with one Nb(2)Cl5 square pyramid, corners with two equivalent Nb(3)Cl5 square pyramids,  an edgeedge with one Rb(1)Cl12 cuboctahedra, and  an edgeedge with one Cu(1)Cl4 tetrahedra. There are nine inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 4-coordinate geometry to two equivalent Rb(1), one Nb(2), and one Cu(1) atom. In the second Cl site, Cl(2) is bonded in a 4-coordinate geometry to one Rb(1), one Nb(3), and two equivalent Cu(1) atoms. In the third Cl site, Cl(3) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Nb(2), and one Nb(3) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Cu(1) atom. In the fifth Cl site, Cl(5) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one Nb(3) atom. In the sixth Cl site, Cl(6) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(1), and one Nb(2) atom. In the seventh Cl site, Cl(7) is bonded in a 2-coordinate geometry to two equivalent Rb(1), one Nb(1), and one Nb(2) atom. In the eighth Cl site, Cl(8) is bonded in a 2-coordinate geometry to one Rb(1), one Nb(2), and one Nb(3) atom. In the ninth Cl site, Cl(9) is bonded in a 3-coordinate geometry to one Rb(1), one Nb(1), and one Nb(3) atom. is represented by the CIF file [CIF]
data_RbNb3CuCl9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.456
_cell_length_b   9.475
_cell_length_c   9.471
_cell_angle_alpha   119.709
_cell_angle_beta   95.730
_cell_angle_gamma   105.577
_symmetry_Int_Tables_number   1
_cell_volume   681.813
_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
  Rb  Rb0  1  0.335  0.475  0.261  1.0
  Rb  Rb1  1  0.665  0.525  0.739  1.0
  Nb  Nb2  1  0.133  0.897  0.343  1.0
  Nb  Nb3  1  0.862  0.749  0.423  1.0
  Nb  Nb4  1  0.859  0.982  0.303  1.0
  Nb  Nb5  1  0.867  0.103  0.657  1.0
  Nb  Nb6  1  0.138  0.251  0.577  1.0
  Nb  Nb7  1  0.141  0.018  0.697  1.0
  Cu  Cu8  1  0.632  0.187  0.055  1.0
  Cu  Cu9  1  0.368  0.813  0.945  1.0
  Cl  Cl10  1  0.676  0.427  0.323  1.0
  Cl  Cl11  1  0.670  0.950  0.047  1.0
  Cl  Cl12  1  0.328  0.319  0.824  1.0
  Cl  Cl13  1  0.672  0.681  0.176  1.0
  Cl  Cl14  1  0.303  0.765  0.148  1.0
  Cl  Cl15  1  0.679  0.098  0.452  1.0
  Cl  Cl16  1  0.324  0.573  0.677  1.0
  Cl  Cl17  1  0.995  0.585  0.228  1.0
  Cl  Cl18  1  0.680  0.824  0.595  1.0
  Cl  Cl19  1  0.697  0.235  0.852  1.0
  Cl  Cl20  1  0.001  0.727  0.643  1.0
  Cl  Cl21  1  0.010  0.143  0.917  1.0
  Cl  Cl22  1  0.999  0.273  0.357  1.0
  Cl  Cl23  1  0.320  0.176  0.405  1.0
  Cl  Cl24  1  0.330  0.050  0.953  1.0
  Cl  Cl25  1  0.005  0.415  0.772  1.0
  Cl  Cl26  1  0.990  0.857  0.083  1.0
  Cl  Cl27  1  0.321  0.902  0.548  1.0
[/CIF]
.