The material structure described by Hf2ON2 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 7-coordinate geometry to one N(11), one N(14), one N(3), one N(4), one N(6), one O(3), and one O(5) atom. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to one N(1), one N(15), one N(16), one N(4), one N(7), one N(8), one O(1), and one O(8) atom. In the third Hf site, Hf(3) is bonded in a 4-coordinate geometry to one N(1), one N(13), one N(6), one N(8), and one O(4) atom. In the fourth Hf site, Hf(4) is bonded in a distorted rectangular see-saw-like geometry to one N(12), one N(16), one O(2), and one O(6) atom. In the fifth Hf site, Hf(5) is bonded in a distorted bent 150 degrees geometry to one N(12), one N(14), and one N(9) atom. In the sixth Hf site, Hf(6) is bonded in a 1-coordinate geometry to one N(11), one O(1), one O(6), and one O(7) atom. In the seventh Hf site, Hf(7) is bonded in a 2-coordinate geometry to one N(2), one N(6), one N(9), and one O(7) atom. In the eighth Hf site, Hf(8) is bonded in a distorted rectangular see-saw-like geometry to one N(11), one N(14), one O(2), and one O(4) atom. In the ninth Hf site, Hf(9) is bonded in a distorted rectangular see-saw-like geometry to one N(12), one N(13), one O(3), and one O(5) atom. In the tenth Hf site, Hf(10) is bonded in a 4-coordinate geometry to one N(1), one N(16), one N(9), and one O(6) atom. In the eleventh Hf site, Hf(11) is bonded in a 4-coordinate geometry to one N(10), one N(15), one N(2), and one O(1) atom. In the twelfth Hf site, Hf(12) is bonded in a distorted bent 150 degrees geometry to one N(1), one N(11), one N(2), one O(2), and one O(5) atom. In the thirteenth Hf site, Hf(13) is bonded in a 1-coordinate geometry to one N(10), one N(16), one N(6), and one O(4) atom. In the fourteenth Hf site, Hf(14) is bonded in a 4-coordinate geometry to one N(10), one N(14), one O(1), and one O(5) atom. In the fifteenth Hf site, Hf(15) is bonded in a 4-coordinate geometry to one N(11), one O(3), one O(7), and one O(8) atom. In the sixteenth Hf site, Hf(16) is bonded in a 7-coordinate geometry to one N(12), one N(13), one N(5), one N(7), one O(2), one O(4), and one O(7) atom. There are sixteen inequivalent N sites. In the first N site, N(1) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(12), one Hf(2), one Hf(3), and one N(8) atom. In the second N site, N(2) is bonded in a distorted T-shaped geometry to one Hf(11), one Hf(12), and one Hf(7) atom. In the third N site, N(3) is bonded in a 2-coordinate geometry to one Hf(1) and one O(5) atom. In the fourth N site, N(4) is bonded in a 1-coordinate geometry to one Hf(1) and one Hf(2) atom. In the fifth N site, N(5) is bonded in a distorted single-bond geometry to one Hf(16) and one N(12) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(13), one Hf(3), and one Hf(7) atom. In the seventh N site, N(7) is bonded in a distorted bent 120 degrees geometry to one Hf(16) and one Hf(2) atom. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(3), and one N(1) atom. In the ninth N site, N(9) is bonded in a 3-coordinate geometry to one Hf(10), one Hf(5), and one Hf(7) atom. In the tenth N site, N(10) is bonded in a 1-coordinate geometry to one Hf(11), one Hf(13), and one Hf(14) atom. In the eleventh N site, N(11) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(12), one Hf(15), one Hf(6), and one Hf(8) atom. In the twelfth N site, N(12) is bonded in a 5-coordinate geometry to one Hf(16), one Hf(4), one Hf(5), one Hf(9), and one N(5) atom. In the thirteenth N site, N(13) is bonded in a 1-coordinate geometry to one Hf(16), one Hf(3), and one Hf(9) atom. In the fourteenth N site, N(14) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(14), one Hf(5), and one Hf(8) atom. In the fifteenth N site, N(15) is bonded in a 2-coordinate geometry to one Hf(11), one Hf(2), and one O(8) atom. In the sixteenth N site, N(16) is bonded in a 4-coordinate geometry to one Hf(10), one Hf(13), one Hf(2), and one Hf(4) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Hf(11), one Hf(14), one Hf(2), and one Hf(6) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(12), one Hf(16), one Hf(4), and one Hf(8) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Hf(1), one Hf(15), and one Hf(9) atom. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Hf(13), one Hf(16), one Hf(3), and one Hf(8) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(12), one Hf(14), one Hf(9), and one N(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Hf(10), one Hf(4), and one Hf(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Hf(15), one Hf(16), one Hf(6), and one Hf(7) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Hf(15), one Hf(2), and one N(15) atom. is represented by the CIF card [CIF]
data_Hf2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.727
_cell_length_b   8.730
_cell_length_c   8.732
_cell_angle_alpha   109.539
_cell_angle_beta   109.343
_cell_angle_gamma   109.449
_symmetry_Int_Tables_number   1
_cell_volume   512.670
_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
  Hf  Hf0  1  0.459  0.702  0.258  1.0
  Hf  Hf1  1  0.015  0.018  0.488  1.0
  Hf  Hf2  1  0.713  0.168  0.538  1.0
  Hf  Hf3  1  0.781  0.812  0.970  1.0
  Hf  Hf4  1  0.690  0.478  0.278  1.0
  Hf  Hf5  1  0.687  0.973  0.783  1.0
  Hf  Hf6  1  0.503  0.008  0.990  1.0
  Hf  Hf7  1  0.514  0.523  0.494  1.0
  Hf  Hf8  1  0.973  0.478  0.012  1.0
  Hf  Hf9  1  0.964  0.217  0.252  1.0
  Hf  Hf10  1  0.022  0.762  0.762  1.0
  Hf  Hf11  1  0.324  0.542  0.709  1.0
  Hf  Hf12  1  0.322  0.040  0.214  1.0
  Hf  Hf13  1  0.209  0.169  0.042  1.0
  Hf  Hf14  1  0.290  0.825  0.459  1.0
  Hf  Hf15  1  0.538  0.292  0.747  1.0
  N  N16  1  0.974  0.203  0.536  1.0
  N  N17  1  0.218  0.683  0.773  1.0
  N  N18  1  0.428  0.686  0.042  1.0
  N  N19  1  0.700  0.745  0.265  1.0
  N  N20  1  0.586  0.320  0.952  1.0
  N  N21  1  0.532  0.988  0.238  1.0
  N  N22  1  0.292  0.246  0.741  1.0
  N  N23  1  0.816  0.053  0.457  1.0
  N  N24  1  0.786  0.320  0.226  1.0
  N  N25  1  0.196  0.925  0.032  1.0
  N  N26  1  0.433  0.707  0.517  1.0
  N  N27  1  0.752  0.525  0.010  1.0
  N  N28  1  0.819  0.305  0.726  1.0
  N  N29  1  0.512  0.500  0.227  1.0
  N  N30  1  0.019  0.796  0.468  1.0
  N  N31  1  0.001  0.970  0.270  1.0
  O  O32  1  0.005  0.035  0.723  1.0
  O  O33  1  0.488  0.500  0.775  1.0
  O  O34  1  0.172  0.686  0.275  1.0
  O  O35  1  0.558  0.282  0.489  1.0
  O  O36  1  0.259  0.486  0.981  1.0
  O  O37  1  0.801  0.077  0.971  1.0
  O  O38  1  0.466  0.008  0.764  1.0
  O  O39  1  0.185  0.950  0.545  1.0
[/CIF]
.
The material structure described by Hf2ON2 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Hf sites. In the first Hf site, Hf(1) is bonded in a 7-coordinate geometry to one N(11), one N(14), one N(3), one N(4), one N(6), one O(3), and one O(5) atom. In the second Hf site, Hf(2) is bonded in a 8-coordinate geometry to one N(1), one N(15), one N(16), one N(4), one N(7), one N(8), one O(1), and one O(8) atom. In the third Hf site, Hf(3) is bonded in a 4-coordinate geometry to one N(1), one N(13), one N(6), one N(8), and one O(4) atom. In the fourth Hf site, Hf(4) is bonded in a distorted rectangular see-saw-like geometry to one N(12), one N(16), one O(2), and one O(6) atom. In the fifth Hf site, Hf(5) is bonded in a distorted bent 150 degrees geometry to one N(12), one N(14), and one N(9) atom. In the sixth Hf site, Hf(6) is bonded in a 1-coordinate geometry to one N(11), one O(1), one O(6), and one O(7) atom. In the seventh Hf site, Hf(7) is bonded in a 2-coordinate geometry to one N(2), one N(6), one N(9), and one O(7) atom. In the eighth Hf site, Hf(8) is bonded in a distorted rectangular see-saw-like geometry to one N(11), one N(14), one O(2), and one O(4) atom. In the ninth Hf site, Hf(9) is bonded in a distorted rectangular see-saw-like geometry to one N(12), one N(13), one O(3), and one O(5) atom. In the tenth Hf site, Hf(10) is bonded in a 4-coordinate geometry to one N(1), one N(16), one N(9), and one O(6) atom. In the eleventh Hf site, Hf(11) is bonded in a 4-coordinate geometry to one N(10), one N(15), one N(2), and one O(1) atom. In the twelfth Hf site, Hf(12) is bonded in a distorted bent 150 degrees geometry to one N(1), one N(11), one N(2), one O(2), and one O(5) atom. In the thirteenth Hf site, Hf(13) is bonded in a 1-coordinate geometry to one N(10), one N(16), one N(6), and one O(4) atom. In the fourteenth Hf site, Hf(14) is bonded in a 4-coordinate geometry to one N(10), one N(14), one O(1), and one O(5) atom. In the fifteenth Hf site, Hf(15) is bonded in a 4-coordinate geometry to one N(11), one O(3), one O(7), and one O(8) atom. In the sixteenth Hf site, Hf(16) is bonded in a 7-coordinate geometry to one N(12), one N(13), one N(5), one N(7), one O(2), one O(4), and one O(7) atom. There are sixteen inequivalent N sites. In the first N site, N(1) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(12), one Hf(2), one Hf(3), and one N(8) atom. In the second N site, N(2) is bonded in a distorted T-shaped geometry to one Hf(11), one Hf(12), and one Hf(7) atom. In the third N site, N(3) is bonded in a 2-coordinate geometry to one Hf(1) and one O(5) atom. In the fourth N site, N(4) is bonded in a 1-coordinate geometry to one Hf(1) and one Hf(2) atom. In the fifth N site, N(5) is bonded in a distorted single-bond geometry to one Hf(16) and one N(12) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(13), one Hf(3), and one Hf(7) atom. In the seventh N site, N(7) is bonded in a distorted bent 120 degrees geometry to one Hf(16) and one Hf(2) atom. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(3), and one N(1) atom. In the ninth N site, N(9) is bonded in a 3-coordinate geometry to one Hf(10), one Hf(5), and one Hf(7) atom. In the tenth N site, N(10) is bonded in a 1-coordinate geometry to one Hf(11), one Hf(13), and one Hf(14) atom. In the eleventh N site, N(11) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(12), one Hf(15), one Hf(6), and one Hf(8) atom. In the twelfth N site, N(12) is bonded in a 5-coordinate geometry to one Hf(16), one Hf(4), one Hf(5), one Hf(9), and one N(5) atom. In the thirteenth N site, N(13) is bonded in a 1-coordinate geometry to one Hf(16), one Hf(3), and one Hf(9) atom. In the fourteenth N site, N(14) is bonded in a 4-coordinate geometry to one Hf(1), one Hf(14), one Hf(5), and one Hf(8) atom. In the fifteenth N site, N(15) is bonded in a 2-coordinate geometry to one Hf(11), one Hf(2), and one O(8) atom. In the sixteenth N site, N(16) is bonded in a 4-coordinate geometry to one Hf(10), one Hf(13), one Hf(2), and one Hf(4) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Hf(11), one Hf(14), one Hf(2), and one Hf(6) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Hf(12), one Hf(16), one Hf(4), and one Hf(8) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Hf(1), one Hf(15), and one Hf(9) atom. In the fourth O site, O(4) is bonded in a distorted see-saw-like geometry to one Hf(13), one Hf(16), one Hf(3), and one Hf(8) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(12), one Hf(14), one Hf(9), and one N(3) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one Hf(10), one Hf(4), and one Hf(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Hf(15), one Hf(16), one Hf(6), and one Hf(7) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Hf(15), one Hf(2), and one N(15) atom. is represented by the CIF card [CIF]
data_Hf2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.727
_cell_length_b   8.730
_cell_length_c   8.732
_cell_angle_alpha   109.539
_cell_angle_beta   109.343
_cell_angle_gamma   109.449
_symmetry_Int_Tables_number   1
_cell_volume   512.670
_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
  Hf  Hf0  1  0.459  0.702  0.258  1.0
  Hf  Hf1  1  0.015  0.018  0.488  1.0
  Hf  Hf2  1  0.713  0.168  0.538  1.0
  Hf  Hf3  1  0.781  0.812  0.970  1.0
  Hf  Hf4  1  0.690  0.478  0.278  1.0
  Hf  Hf5  1  0.687  0.973  0.783  1.0
  Hf  Hf6  1  0.503  0.008  0.990  1.0
  Hf  Hf7  1  0.514  0.523  0.494  1.0
  Hf  Hf8  1  0.973  0.478  0.012  1.0
  Hf  Hf9  1  0.964  0.217  0.252  1.0
  Hf  Hf10  1  0.022  0.762  0.762  1.0
  Hf  Hf11  1  0.324  0.542  0.709  1.0
  Hf  Hf12  1  0.322  0.040  0.214  1.0
  Hf  Hf13  1  0.209  0.169  0.042  1.0
  Hf  Hf14  1  0.290  0.825  0.459  1.0
  Hf  Hf15  1  0.538  0.292  0.747  1.0
  N  N16  1  0.974  0.203  0.536  1.0
  N  N17  1  0.218  0.683  0.773  1.0
  N  N18  1  0.428  0.686  0.042  1.0
  N  N19  1  0.700  0.745  0.265  1.0
  N  N20  1  0.586  0.320  0.952  1.0
  N  N21  1  0.532  0.988  0.238  1.0
  N  N22  1  0.292  0.246  0.741  1.0
  N  N23  1  0.816  0.053  0.457  1.0
  N  N24  1  0.786  0.320  0.226  1.0
  N  N25  1  0.196  0.925  0.032  1.0
  N  N26  1  0.433  0.707  0.517  1.0
  N  N27  1  0.752  0.525  0.010  1.0
  N  N28  1  0.819  0.305  0.726  1.0
  N  N29  1  0.512  0.500  0.227  1.0
  N  N30  1  0.019  0.796  0.468  1.0
  N  N31  1  0.001  0.970  0.270  1.0
  O  O32  1  0.005  0.035  0.723  1.0
  O  O33  1  0.488  0.500  0.775  1.0
  O  O34  1  0.172  0.686  0.275  1.0
  O  O35  1  0.558  0.282  0.489  1.0
  O  O36  1  0.259  0.486  0.981  1.0
  O  O37  1  0.801  0.077  0.971  1.0
  O  O38  1  0.466  0.008  0.764  1.0
  O  O39  1  0.185  0.950  0.545  1.0
[/CIF]
.