The structure described by W11Ni2C4 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent W sites. In the first W site, W(1) is bonded in a 13-coordinate geometry to one W(1), one W(10), one W(2), two equivalent W(5), two equivalent W(6), two equivalent W(8), two equivalent W(9), one Ni(1), and one C(1) atom. In the second W site, W(2) is bonded to two equivalent W(1), two equivalent W(10), two equivalent W(5), two equivalent W(7), and four equivalent W(8) atoms to form WW12 cuboctahedra that share corners with four equivalent C(4)Ni2W4 octahedra, faces with two equivalent W(5)W12 cuboctahedra, and faces with four equivalent C(3)NiW5 octahedra. The corner-sharing octahedral tilt angles are 47°. In the third W site, W(3) is bonded in a 2-coordinate geometry to two equivalent W(5), one Ni(2), and one Ni(3) atom. In the fourth W site, W(4) is bonded in a 2-coordinate geometry to two equivalent W(5) and two equivalent Ni(2) atoms. In the fifth W site, W(5) is bonded to one W(2), one W(4), one W(7), one W(9), two equivalent W(1), two equivalent W(3), two equivalent W(6), and two equivalent W(8) atoms to form distorted WW12 cuboctahedra that share edges with two equivalent C(4)Ni2W4 octahedra, edges with four equivalent C(3)NiW5 octahedra,  a faceface with one W(2)W12 cuboctahedra, and faces with two equivalent W(5)W12 cuboctahedra. In the sixth W site, W(6) is bonded in a distorted bent 150 degrees geometry to one W(1), one W(5), one C(3), and one C(4) atom. In the seventh W site, W(7) is bonded in a 2-coordinate geometry to one W(2), one W(5), and two equivalent C(3) atoms. In the eighth W site, W(8) is bonded in a 2-coordinate geometry to one W(1), one W(2), one W(5), one C(3), and one C(4) atom. In the ninth W site, W(9) is bonded in a distorted bent 150 degrees geometry to one W(5), two equivalent W(1), and two equivalent C(3) atoms. In the tenth W site, W(10) is bonded in a 3-coordinate geometry to one W(1), one W(2), one C(1), and two equivalent C(3) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted T-shaped geometry to two equivalent W(1), one C(1), and two equivalent C(4) atoms. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one W(3), one W(4), one C(2), and two equivalent C(3) atoms. In the third Ni site, Ni(3) is bonded in a 3-coordinate geometry to two equivalent W(3), one C(2), and two equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to two equivalent W(1), two equivalent W(10), and one Ni(1) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one Ni(3) and two equivalent Ni(2) atoms. In the third C site, C(3) is bonded to one W(10), one W(6), one W(7), one W(8), one W(9), and one Ni(2) atom to form CNiW5 octahedra that share corners with two equivalent C(4)Ni2W4 octahedra, corners with four equivalent C(3)NiW5 octahedra, edges with two equivalent W(5)W12 cuboctahedra, and  a faceface with one W(2)W12 cuboctahedra. The corner-sharing octahedral tilt angles range from 22-45°. In the fourth C site, C(4) is bonded to two equivalent W(6), two equivalent W(8), one Ni(1), and one Ni(3) atom to form CNi2W4 octahedra that share corners with two equivalent W(2)W12 cuboctahedra, corners with two equivalent C(4)Ni2W4 octahedra, corners with four equivalent C(3)NiW5 octahedra, and edges with two equivalent W(5)W12 cuboctahedra. The corner-sharing octahedral tilt angles range from 5-42°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ni2W11C4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.038
_cell_length_b   8.038
_cell_length_c   8.224
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.080
_symmetry_Int_Tables_number   1
_cell_volume   455.030
_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
  Ni  Ni0  1  0.504  0.496  0.000  1.0
  Ni  Ni1  1  0.524  0.058  0.500  1.0
  Ni  Ni2  1  0.942  0.476  0.500  1.0
  Ni  Ni3  1  0.523  0.477  0.500  1.0
  W  W4  1  0.132  0.245  0.000  1.0
  W  W5  1  0.755  0.868  0.000  1.0
  W  W6  1  0.107  0.893  0.000  1.0
  W  W7  1  0.880  0.766  0.500  1.0
  W  W8  1  0.234  0.120  0.500  1.0
  W  W9  1  0.879  0.121  0.500  1.0
  W  W10  1  0.994  0.006  0.254  1.0
  W  W11  1  0.994  0.006  0.746  1.0
  W  W12  1  0.208  0.423  0.682  1.0
  W  W13  1  0.577  0.792  0.682  1.0
  W  W14  1  0.206  0.794  0.685  1.0
  W  W15  1  0.789  0.582  0.796  1.0
  W  W16  1  0.418  0.211  0.796  1.0
  W  W17  1  0.790  0.210  0.815  1.0
  W  W18  1  0.789  0.582  0.204  1.0
  W  W19  1  0.418  0.211  0.204  1.0
  W  W20  1  0.790  0.210  0.185  1.0
  W  W21  1  0.208  0.423  0.318  1.0
  W  W22  1  0.577  0.792  0.318  1.0
  W  W23  1  0.206  0.794  0.315  1.0
  W  W24  1  0.450  0.916  0.000  1.0
  W  W25  1  0.084  0.550  0.000  1.0
  C  C26  1  0.370  0.630  0.000  1.0
  C  C27  1  0.660  0.340  0.500  1.0
  C  C28  1  0.499  0.001  0.256  1.0
  C  C29  1  0.999  0.501  0.256  1.0
  C  C30  1  0.497  0.503  0.253  1.0
  C  C31  1  0.499  0.001  0.744  1.0
  C  C32  1  0.999  0.501  0.744  1.0
  C  C33  1  0.497  0.503  0.747  1.0
[/CIF]
.
The structure described by W11Ni2C4 crystallizes in the orthorhombic Amm2 space group. There are ten inequivalent W sites. In the first W site, W(1) is bonded in a 13-coordinate geometry to one W(1), one W(10), one W(2), two equivalent W(5), two equivalent W(6), two equivalent W(8), two equivalent W(9), one Ni(1), and one C(1) atom. In the second W site, W(2) is bonded to two equivalent W(1), two equivalent W(10), two equivalent W(5), two equivalent W(7), and four equivalent W(8) atoms to form WW12 cuboctahedra that share corners with four equivalent C(4)Ni2W4 octahedra, faces with two equivalent W(5)W12 cuboctahedra, and faces with four equivalent C(3)NiW5 octahedra. The corner-sharing octahedral tilt angles are 47°. In the third W site, W(3) is bonded in a 2-coordinate geometry to two equivalent W(5), one Ni(2), and one Ni(3) atom. In the fourth W site, W(4) is bonded in a 2-coordinate geometry to two equivalent W(5) and two equivalent Ni(2) atoms. In the fifth W site, W(5) is bonded to one W(2), one W(4), one W(7), one W(9), two equivalent W(1), two equivalent W(3), two equivalent W(6), and two equivalent W(8) atoms to form distorted WW12 cuboctahedra that share edges with two equivalent C(4)Ni2W4 octahedra, edges with four equivalent C(3)NiW5 octahedra,  a faceface with one W(2)W12 cuboctahedra, and faces with two equivalent W(5)W12 cuboctahedra. In the sixth W site, W(6) is bonded in a distorted bent 150 degrees geometry to one W(1), one W(5), one C(3), and one C(4) atom. In the seventh W site, W(7) is bonded in a 2-coordinate geometry to one W(2), one W(5), and two equivalent C(3) atoms. In the eighth W site, W(8) is bonded in a 2-coordinate geometry to one W(1), one W(2), one W(5), one C(3), and one C(4) atom. In the ninth W site, W(9) is bonded in a distorted bent 150 degrees geometry to one W(5), two equivalent W(1), and two equivalent C(3) atoms. In the tenth W site, W(10) is bonded in a 3-coordinate geometry to one W(1), one W(2), one C(1), and two equivalent C(3) atoms. There are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted T-shaped geometry to two equivalent W(1), one C(1), and two equivalent C(4) atoms. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one W(3), one W(4), one C(2), and two equivalent C(3) atoms. In the third Ni site, Ni(3) is bonded in a 3-coordinate geometry to two equivalent W(3), one C(2), and two equivalent C(4) atoms. There are four inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to two equivalent W(1), two equivalent W(10), and one Ni(1) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one Ni(3) and two equivalent Ni(2) atoms. In the third C site, C(3) is bonded to one W(10), one W(6), one W(7), one W(8), one W(9), and one Ni(2) atom to form CNiW5 octahedra that share corners with two equivalent C(4)Ni2W4 octahedra, corners with four equivalent C(3)NiW5 octahedra, edges with two equivalent W(5)W12 cuboctahedra, and  a faceface with one W(2)W12 cuboctahedra. The corner-sharing octahedral tilt angles range from 22-45°. In the fourth C site, C(4) is bonded to two equivalent W(6), two equivalent W(8), one Ni(1), and one Ni(3) atom to form CNi2W4 octahedra that share corners with two equivalent W(2)W12 cuboctahedra, corners with two equivalent C(4)Ni2W4 octahedra, corners with four equivalent C(3)NiW5 octahedra, and edges with two equivalent W(5)W12 cuboctahedra. The corner-sharing octahedral tilt angles range from 5-42°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Ni2W11C4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.038
_cell_length_b   8.038
_cell_length_c   8.224
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   121.080
_symmetry_Int_Tables_number   1
_cell_volume   455.030
_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
  Ni  Ni0  1  0.504  0.496  0.000  1.0
  Ni  Ni1  1  0.524  0.058  0.500  1.0
  Ni  Ni2  1  0.942  0.476  0.500  1.0
  Ni  Ni3  1  0.523  0.477  0.500  1.0
  W  W4  1  0.132  0.245  0.000  1.0
  W  W5  1  0.755  0.868  0.000  1.0
  W  W6  1  0.107  0.893  0.000  1.0
  W  W7  1  0.880  0.766  0.500  1.0
  W  W8  1  0.234  0.120  0.500  1.0
  W  W9  1  0.879  0.121  0.500  1.0
  W  W10  1  0.994  0.006  0.254  1.0
  W  W11  1  0.994  0.006  0.746  1.0
  W  W12  1  0.208  0.423  0.682  1.0
  W  W13  1  0.577  0.792  0.682  1.0
  W  W14  1  0.206  0.794  0.685  1.0
  W  W15  1  0.789  0.582  0.796  1.0
  W  W16  1  0.418  0.211  0.796  1.0
  W  W17  1  0.790  0.210  0.815  1.0
  W  W18  1  0.789  0.582  0.204  1.0
  W  W19  1  0.418  0.211  0.204  1.0
  W  W20  1  0.790  0.210  0.185  1.0
  W  W21  1  0.208  0.423  0.318  1.0
  W  W22  1  0.577  0.792  0.318  1.0
  W  W23  1  0.206  0.794  0.315  1.0
  W  W24  1  0.450  0.916  0.000  1.0
  W  W25  1  0.084  0.550  0.000  1.0
  C  C26  1  0.370  0.630  0.000  1.0
  C  C27  1  0.660  0.340  0.500  1.0
  C  C28  1  0.499  0.001  0.256  1.0
  C  C29  1  0.999  0.501  0.256  1.0
  C  C30  1  0.497  0.503  0.253  1.0
  C  C31  1  0.499  0.001  0.744  1.0
  C  C32  1  0.999  0.501  0.744  1.0
  C  C33  1  0.497  0.503  0.747  1.0
[/CIF]
.