The structure described by Er7C2NI12 crystallizes in the triclinic P-1 space group. There are seven inequivalent Er sites. In the first Er site, Er(1) is bonded to one C(2), one I(11), one I(12), one I(5), one I(6), and one I(9) atom to form distorted ErCI5 octahedra that share  a cornercorner with one Er(3)C2I5 pentagonal bipyramid,  an edgeedge with one Er(4)CI5 octahedra, and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. In the second Er site, Er(2) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(3), one I(4), one I(6), and one I(7) atom. In the third Er site, Er(3) is bonded to one C(1), one C(2), one I(10), one I(2), one I(3), and two equivalent I(5) atoms to form distorted ErC2I5 pentagonal bipyramids that share  a cornercorner with one Er(1)CI5 octahedra,  an edgeedge with one Er(1)CI5 octahedra,  an edgeedge with one Er(4)CI5 octahedra, and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 4°. In the fourth Er site, Er(4) is bonded to one C(1), one I(10), one I(12), one I(4), one I(6), and one I(8) atom to form distorted ErCI5 octahedra that share  an edgeedge with one Er(1)CI5 octahedra and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. In the fifth Er site, Er(5) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(1), one I(7), one I(8), and one I(9) atom. In the sixth Er site, Er(6) is bonded in a distorted L-shaped geometry to two equivalent N(1), one I(4), one I(6), one I(8), and one I(9) atom. In the seventh Er site, Er(7) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(1), one I(11), one I(12), and two equivalent I(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Er(2), one Er(3), one Er(4), one Er(5), one Er(7), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(3), one Er(5), one Er(7), and one C(1) atom. N(1) is bonded to one Er(2), one Er(5), and two equivalent Er(6) atoms to form NEr4 tetrahedra that share  a cornercorner with one I(6)Er4 trigonal pyramid,  an edgeedge with one N(1)Er4 tetrahedra, and  an edgeedge with one I(6)Er4 trigonal pyramid. There are twelve inequivalent I sites. In the first I site, I(1) is bonded in a 2-coordinate geometry to one Er(5) and one Er(7) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one Er(3) and two equivalent Er(7) atoms. In the third I site, I(3) is bonded in a 2-coordinate geometry to one Er(2) and one Er(3) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Er(2), one Er(4), and one Er(6) atom. In the fifth I site, I(5) is bonded in a distorted T-shaped geometry to one Er(1) and two equivalent Er(3) atoms. In the sixth I site, I(6) is bonded to one Er(1), one Er(2), one Er(4), and one Er(6) atom to form distorted IEr4 trigonal pyramids that share  a cornercorner with one N(1)Er4 tetrahedra and  an edgeedge with one N(1)Er4 tetrahedra. In the seventh I site, I(7) is bonded in a distorted bent 120 degrees geometry to one Er(2) and one Er(5) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Er(4), one Er(5), and one Er(6) atom. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Er(1), one Er(5), and one Er(6) atom. In the tenth I site, I(10) is bonded in a distorted L-shaped geometry to one Er(3) and one Er(4) atom. In the eleventh I site, I(11) is bonded in a distorted L-shaped geometry to one Er(1) and one Er(7) atom. In the twelfth I site, I(12) is bonded in a T-shaped geometry to one Er(1), one Er(4), and one Er(7) atom. is represented by the CIF card [CIF]
data_Er7C2I12N
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.853
_cell_length_b   10.498
_cell_length_c   16.863
_cell_angle_alpha   101.416
_cell_angle_beta   93.011
_cell_angle_gamma   112.909
_symmetry_Int_Tables_number   1
_cell_volume   1558.671
_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  0.453  0.748  0.809  1.0
  Er  Er1  1  0.480  0.567  0.321  1.0
  Er  Er2  1  0.662  0.543  0.885  1.0
  Er  Er3  1  0.065  0.431  0.264  1.0
  Er  Er4  1  0.935  0.569  0.736  1.0
  Er  Er5  1  0.282  0.243  0.350  1.0
  Er  Er6  1  0.520  0.433  0.679  1.0
  Er  Er7  1  0.640  0.452  0.481  1.0
  Er  Er8  1  0.866  0.882  0.855  1.0
  Er  Er9  1  0.360  0.548  0.519  1.0
  Er  Er10  1  0.338  0.457  0.115  1.0
  Er  Er11  1  0.718  0.757  0.650  1.0
  Er  Er12  1  0.134  0.118  0.145  1.0
  Er  Er13  1  0.547  0.252  0.191  1.0
  C  C14  1  0.756  0.638  0.766  1.0
  C  C15  1  0.635  0.680  0.784  1.0
  C  C16  1  0.365  0.320  0.216  1.0
  C  C17  1  0.244  0.362  0.234  1.0
  I  I18  1  0.048  0.943  0.268  1.0
  I  I19  1  0.125  0.199  0.982  1.0
  I  I20  1  0.562  0.749  0.197  1.0
  I  I21  1  0.729  0.290  0.610  1.0
  I  I22  1  0.609  0.399  0.050  1.0
  I  I23  1  0.211  0.468  0.688  1.0
  I  I24  1  0.296  0.178  0.530  1.0
  I  I25  1  0.029  0.320  0.424  1.0
  I  I26  1  0.457  0.857  0.650  1.0
  I  I27  1  0.971  0.680  0.576  1.0
  I  I28  1  0.704  0.822  0.470  1.0
  I  I29  1  0.543  0.143  0.350  1.0
  I  I30  1  0.906  0.429  0.874  1.0
  I  I31  1  0.271  0.710  0.390  1.0
  I  I32  1  0.789  0.532  0.312  1.0
  I  I33  1  0.660  0.027  0.912  1.0
  I  I34  1  0.094  0.571  0.126  1.0
  I  I35  1  0.391  0.601  0.950  1.0
  I  I36  1  0.875  0.801  0.018  1.0
  I  I37  1  0.174  0.847  0.836  1.0
  I  I38  1  0.340  0.973  0.088  1.0
  I  I39  1  0.952  0.057  0.732  1.0
  I  I40  1  0.438  0.251  0.803  1.0
  I  I41  1  0.826  0.153  0.164  1.0
  N  N42  1  0.441  0.452  0.416  1.0
  N  N43  1  0.559  0.548  0.584  1.0
[/CIF]
.
The structure described by Er7C2NI12 crystallizes in the triclinic P-1 space group. There are seven inequivalent Er sites. In the first Er site, Er(1) is bonded to one C(2), one I(11), one I(12), one I(5), one I(6), and one I(9) atom to form distorted ErCI5 octahedra that share  a cornercorner with one Er(3)C2I5 pentagonal bipyramid,  an edgeedge with one Er(4)CI5 octahedra, and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. In the second Er site, Er(2) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(3), one I(4), one I(6), and one I(7) atom. In the third Er site, Er(3) is bonded to one C(1), one C(2), one I(10), one I(2), one I(3), and two equivalent I(5) atoms to form distorted ErC2I5 pentagonal bipyramids that share  a cornercorner with one Er(1)CI5 octahedra,  an edgeedge with one Er(1)CI5 octahedra,  an edgeedge with one Er(4)CI5 octahedra, and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. The corner-sharing octahedral tilt angles are 4°. In the fourth Er site, Er(4) is bonded to one C(1), one I(10), one I(12), one I(4), one I(6), and one I(8) atom to form distorted ErCI5 octahedra that share  an edgeedge with one Er(1)CI5 octahedra and  an edgeedge with one Er(3)C2I5 pentagonal bipyramid. In the fifth Er site, Er(5) is bonded in a distorted single-bond geometry to one C(1), one C(2), one N(1), one I(1), one I(7), one I(8), and one I(9) atom. In the sixth Er site, Er(6) is bonded in a distorted L-shaped geometry to two equivalent N(1), one I(4), one I(6), one I(8), and one I(9) atom. In the seventh Er site, Er(7) is bonded in a 7-coordinate geometry to one C(1), one C(2), one I(1), one I(11), one I(12), and two equivalent I(2) atoms. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 6-coordinate geometry to one Er(2), one Er(3), one Er(4), one Er(5), one Er(7), and one C(2) atom. In the second C site, C(2) is bonded in a 6-coordinate geometry to one Er(1), one Er(2), one Er(3), one Er(5), one Er(7), and one C(1) atom. N(1) is bonded to one Er(2), one Er(5), and two equivalent Er(6) atoms to form NEr4 tetrahedra that share  a cornercorner with one I(6)Er4 trigonal pyramid,  an edgeedge with one N(1)Er4 tetrahedra, and  an edgeedge with one I(6)Er4 trigonal pyramid. There are twelve inequivalent I sites. In the first I site, I(1) is bonded in a 2-coordinate geometry to one Er(5) and one Er(7) atom. In the second I site, I(2) is bonded in a 3-coordinate geometry to one Er(3) and two equivalent Er(7) atoms. In the third I site, I(3) is bonded in a 2-coordinate geometry to one Er(2) and one Er(3) atom. In the fourth I site, I(4) is bonded in a distorted T-shaped geometry to one Er(2), one Er(4), and one Er(6) atom. In the fifth I site, I(5) is bonded in a distorted T-shaped geometry to one Er(1) and two equivalent Er(3) atoms. In the sixth I site, I(6) is bonded to one Er(1), one Er(2), one Er(4), and one Er(6) atom to form distorted IEr4 trigonal pyramids that share  a cornercorner with one N(1)Er4 tetrahedra and  an edgeedge with one N(1)Er4 tetrahedra. In the seventh I site, I(7) is bonded in a distorted bent 120 degrees geometry to one Er(2) and one Er(5) atom. In the eighth I site, I(8) is bonded in a distorted T-shaped geometry to one Er(4), one Er(5), and one Er(6) atom. In the ninth I site, I(9) is bonded in a distorted T-shaped geometry to one Er(1), one Er(5), and one Er(6) atom. In the tenth I site, I(10) is bonded in a distorted L-shaped geometry to one Er(3) and one Er(4) atom. In the eleventh I site, I(11) is bonded in a distorted L-shaped geometry to one Er(1) and one Er(7) atom. In the twelfth I site, I(12) is bonded in a T-shaped geometry to one Er(1), one Er(4), and one Er(7) atom. is represented by the CIF card [CIF]
data_Er7C2I12N
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.853
_cell_length_b   10.498
_cell_length_c   16.863
_cell_angle_alpha   101.416
_cell_angle_beta   93.011
_cell_angle_gamma   112.909
_symmetry_Int_Tables_number   1
_cell_volume   1558.671
_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  0.453  0.748  0.809  1.0
  Er  Er1  1  0.480  0.567  0.321  1.0
  Er  Er2  1  0.662  0.543  0.885  1.0
  Er  Er3  1  0.065  0.431  0.264  1.0
  Er  Er4  1  0.935  0.569  0.736  1.0
  Er  Er5  1  0.282  0.243  0.350  1.0
  Er  Er6  1  0.520  0.433  0.679  1.0
  Er  Er7  1  0.640  0.452  0.481  1.0
  Er  Er8  1  0.866  0.882  0.855  1.0
  Er  Er9  1  0.360  0.548  0.519  1.0
  Er  Er10  1  0.338  0.457  0.115  1.0
  Er  Er11  1  0.718  0.757  0.650  1.0
  Er  Er12  1  0.134  0.118  0.145  1.0
  Er  Er13  1  0.547  0.252  0.191  1.0
  C  C14  1  0.756  0.638  0.766  1.0
  C  C15  1  0.635  0.680  0.784  1.0
  C  C16  1  0.365  0.320  0.216  1.0
  C  C17  1  0.244  0.362  0.234  1.0
  I  I18  1  0.048  0.943  0.268  1.0
  I  I19  1  0.125  0.199  0.982  1.0
  I  I20  1  0.562  0.749  0.197  1.0
  I  I21  1  0.729  0.290  0.610  1.0
  I  I22  1  0.609  0.399  0.050  1.0
  I  I23  1  0.211  0.468  0.688  1.0
  I  I24  1  0.296  0.178  0.530  1.0
  I  I25  1  0.029  0.320  0.424  1.0
  I  I26  1  0.457  0.857  0.650  1.0
  I  I27  1  0.971  0.680  0.576  1.0
  I  I28  1  0.704  0.822  0.470  1.0
  I  I29  1  0.543  0.143  0.350  1.0
  I  I30  1  0.906  0.429  0.874  1.0
  I  I31  1  0.271  0.710  0.390  1.0
  I  I32  1  0.789  0.532  0.312  1.0
  I  I33  1  0.660  0.027  0.912  1.0
  I  I34  1  0.094  0.571  0.126  1.0
  I  I35  1  0.391  0.601  0.950  1.0
  I  I36  1  0.875  0.801  0.018  1.0
  I  I37  1  0.174  0.847  0.836  1.0
  I  I38  1  0.340  0.973  0.088  1.0
  I  I39  1  0.952  0.057  0.732  1.0
  I  I40  1  0.438  0.251  0.803  1.0
  I  I41  1  0.826  0.153  0.164  1.0
  N  N42  1  0.441  0.452  0.416  1.0
  N  N43  1  0.559  0.548  0.584  1.0
[/CIF]
.