The compound 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 distorted rectangular see-saw-like geometry to one N(16), one N(7), one O(4), and one O(6) atom. In the second Hf site, Hf(2) is bonded in a 4-coordinate geometry to one N(12), one N(15), one N(3), one N(4), and one O(4) atom. In the third Hf site, Hf(3) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(9), and one O(8) atom. In the fourth Hf site, Hf(4) is bonded in a 7-coordinate geometry to one N(4), one N(5), one N(7), one O(2), one O(4), one O(5), and one O(7) atom. In the fifth Hf site, Hf(5) is bonded in a 4-coordinate geometry to one N(13), one N(6), one N(7), and one O(7) atom. In the sixth Hf site, Hf(6) is bonded in a 2-coordinate geometry to one N(10), one O(4), and one O(6) atom. In the seventh Hf site, Hf(7) is bonded in a 8-coordinate geometry to one N(1), one N(15), one N(3), one N(6), one N(8), one N(9), one O(1), and one O(2) atom. In the eighth Hf site, Hf(8) is bonded in a rectangular see-saw-like geometry to one N(11), one N(4), one O(3), and one O(7) atom. In the ninth Hf site, Hf(9) is bonded in a 2-coordinate geometry to one N(10), one N(12), one N(2), and one O(5) atom. In the tenth Hf site, Hf(10) is bonded in a distorted bent 150 degrees geometry to one N(11), one N(16), one N(2), one N(3), and one N(7) atom. In the eleventh Hf site, Hf(11) is bonded in a distorted single-bond geometry to one N(1), one N(13), one N(16), and one O(5) atom. In the twelfth Hf site, Hf(12) is bonded in a distorted single-bond geometry to one N(12), one N(6), one O(4), and one O(8) atom. In the thirteenth Hf site, Hf(13) is bonded in a distorted rectangular see-saw-like geometry to one N(1), one N(11), one O(6), and one O(8) atom. In the fourteenth Hf site, Hf(14) is bonded in a 1-coordinate geometry to one N(11), one N(12), one N(14), one N(16), and one O(1) atom. In the fifteenth Hf site, Hf(15) is bonded in a 4-coordinate geometry to one N(10), one N(13), one N(3), and one N(6) atom. In the sixteenth Hf site, Hf(16) is bonded in a 4-coordinate geometry to one N(16), one N(8), one O(3), and one O(5) atom. There are sixteen inequivalent N sites. In the first N site, N(1) is bonded in a 4-coordinate geometry to one Hf(11), one Hf(13), one Hf(3), and one Hf(7) atom. In the second N site, N(2) is bonded in a 3-coordinate geometry to one Hf(10), one Hf(3), and one Hf(9) atom. In the third N site, N(3) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(15), one Hf(2), one Hf(7), and one N(15) atom. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(4), and one Hf(8) atom. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Hf(4) and one O(7) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Hf(12), one Hf(15), one Hf(5), and one Hf(7) atom. In the seventh N site, N(7) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(10), one Hf(4), one Hf(5), and one O(2) atom. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Hf(16), one Hf(7), and one N(9) atom. In the ninth N site, N(9) is bonded in a 1-coordinate geometry to one Hf(3), one Hf(7), and one N(8) atom. In the tenth N site, N(10) is bonded in a distorted T-shaped geometry to one Hf(15), one Hf(6), and one Hf(9) atom. In the eleventh N site, N(11) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(13), one Hf(14), one Hf(8), and one N(14) atom. In the twelfth N site, N(12) is bonded to one Hf(12), one Hf(14), one Hf(2), and one Hf(9) atom to form distorted NHf4 trigonal pyramids that share  an edgeedge with one O(4)Hf5 square pyramid. In the thirteenth N site, N(13) is bonded in a 1-coordinate geometry to one Hf(11), one Hf(15), and one Hf(5) atom. In the fourteenth N site, N(14) is bonded in a single-bond geometry to one Hf(14) and one N(11) atom. In the fifteenth N site, N(15) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(7), and one N(3) atom. In the sixteenth N site, N(16) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(10), one Hf(11), one Hf(14), and one Hf(16) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Hf(14) and one Hf(7) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Hf(4), one Hf(7), and one N(7) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Hf(16) and one Hf(8) atom. In the fourth O site, O(4) is bonded to one Hf(1), one Hf(12), one Hf(2), one Hf(4), and one Hf(6) atom to form distorted OHf5 square pyramids that share  an edgeedge with one N(12)Hf4 trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Hf(11), one Hf(16), one Hf(4), and one Hf(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Hf(1), one Hf(13), and one Hf(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Hf(4), one Hf(5), one Hf(8), and one N(5) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Hf(12), one Hf(13), and one Hf(3) atom. is represented by the CIF card [CIF]
data_Hf2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.705
_cell_length_b   8.721
_cell_length_c   8.751
_cell_angle_alpha   109.610
_cell_angle_beta   109.340
_cell_angle_gamma   109.256
_symmetry_Int_Tables_number   1
_cell_volume   512.674
_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  0.502  0.491  0.499  1.0
  Hf  Hf1  1  0.286  0.829  0.463  1.0
  Hf  Hf2  1  0.973  0.222  0.249  1.0
  Hf  Hf3  1  0.446  0.696  0.258  1.0
  Hf  Hf4  1  0.224  0.180  0.035  1.0
  Hf  Hf5  1  0.336  0.560  0.706  1.0
  Hf  Hf6  1  0.026  0.022  0.487  1.0
  Hf  Hf7  1  0.002  0.515  0.994  1.0
  Hf  Hf8  1  0.478  0.986  0.012  1.0
  Hf  Hf9  1  0.682  0.455  0.285  1.0
  Hf  Hf10  1  0.312  0.034  0.216  1.0
  Hf  Hf11  1  0.681  0.963  0.785  1.0
  Hf  Hf12  1  0.776  0.812  0.966  1.0
  Hf  Hf13  1  0.537  0.282  0.750  1.0
  Hf  Hf14  1  0.037  0.788  0.749  1.0
  Hf  Hf15  1  0.714  0.178  0.537  1.0
  N  N16  1  0.995  0.967  0.272  1.0
  N  N17  1  0.781  0.307  0.230  1.0
  N  N18  1  0.018  0.785  0.470  1.0
  N  N19  1  0.192  0.700  0.268  1.0
  N  N20  1  0.421  0.684  0.044  1.0
  N  N21  1  0.008  0.044  0.724  1.0
  N  N22  1  0.516  0.506  0.226  1.0
  N  N23  1  0.813  0.049  0.457  1.0
  N  N24  1  0.980  0.205  0.534  1.0
  N  N25  1  0.209  0.672  0.778  1.0
  N  N26  1  0.744  0.517  0.016  1.0
  N  N27  1  0.458  0.007  0.767  1.0
  N  N28  1  0.196  0.927  0.032  1.0
  N  N29  1  0.581  0.322  0.952  1.0
  N  N30  1  0.180  0.938  0.547  1.0
  N  N31  1  0.565  0.293  0.485  1.0
  O  O32  1  0.304  0.263  0.734  1.0
  O  O33  1  0.694  0.747  0.267  1.0
  O  O34  1  0.823  0.308  0.726  1.0
  O  O35  1  0.416  0.693  0.526  1.0
  O  O36  1  0.543  0.989  0.236  1.0
  O  O37  1  0.472  0.491  0.779  1.0
  O  O38  1  0.266  0.488  0.978  1.0
  O  O39  1  0.814  0.084  0.960  1.0
[/CIF]
.
The compound 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 distorted rectangular see-saw-like geometry to one N(16), one N(7), one O(4), and one O(6) atom. In the second Hf site, Hf(2) is bonded in a 4-coordinate geometry to one N(12), one N(15), one N(3), one N(4), and one O(4) atom. In the third Hf site, Hf(3) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(9), and one O(8) atom. In the fourth Hf site, Hf(4) is bonded in a 7-coordinate geometry to one N(4), one N(5), one N(7), one O(2), one O(4), one O(5), and one O(7) atom. In the fifth Hf site, Hf(5) is bonded in a 4-coordinate geometry to one N(13), one N(6), one N(7), and one O(7) atom. In the sixth Hf site, Hf(6) is bonded in a 2-coordinate geometry to one N(10), one O(4), and one O(6) atom. In the seventh Hf site, Hf(7) is bonded in a 8-coordinate geometry to one N(1), one N(15), one N(3), one N(6), one N(8), one N(9), one O(1), and one O(2) atom. In the eighth Hf site, Hf(8) is bonded in a rectangular see-saw-like geometry to one N(11), one N(4), one O(3), and one O(7) atom. In the ninth Hf site, Hf(9) is bonded in a 2-coordinate geometry to one N(10), one N(12), one N(2), and one O(5) atom. In the tenth Hf site, Hf(10) is bonded in a distorted bent 150 degrees geometry to one N(11), one N(16), one N(2), one N(3), and one N(7) atom. In the eleventh Hf site, Hf(11) is bonded in a distorted single-bond geometry to one N(1), one N(13), one N(16), and one O(5) atom. In the twelfth Hf site, Hf(12) is bonded in a distorted single-bond geometry to one N(12), one N(6), one O(4), and one O(8) atom. In the thirteenth Hf site, Hf(13) is bonded in a distorted rectangular see-saw-like geometry to one N(1), one N(11), one O(6), and one O(8) atom. In the fourteenth Hf site, Hf(14) is bonded in a 1-coordinate geometry to one N(11), one N(12), one N(14), one N(16), and one O(1) atom. In the fifteenth Hf site, Hf(15) is bonded in a 4-coordinate geometry to one N(10), one N(13), one N(3), and one N(6) atom. In the sixteenth Hf site, Hf(16) is bonded in a 4-coordinate geometry to one N(16), one N(8), one O(3), and one O(5) atom. There are sixteen inequivalent N sites. In the first N site, N(1) is bonded in a 4-coordinate geometry to one Hf(11), one Hf(13), one Hf(3), and one Hf(7) atom. In the second N site, N(2) is bonded in a 3-coordinate geometry to one Hf(10), one Hf(3), and one Hf(9) atom. In the third N site, N(3) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(15), one Hf(2), one Hf(7), and one N(15) atom. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(4), and one Hf(8) atom. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Hf(4) and one O(7) atom. In the sixth N site, N(6) is bonded in a 4-coordinate geometry to one Hf(12), one Hf(15), one Hf(5), and one Hf(7) atom. In the seventh N site, N(7) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(10), one Hf(4), one Hf(5), and one O(2) atom. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Hf(16), one Hf(7), and one N(9) atom. In the ninth N site, N(9) is bonded in a 1-coordinate geometry to one Hf(3), one Hf(7), and one N(8) atom. In the tenth N site, N(10) is bonded in a distorted T-shaped geometry to one Hf(15), one Hf(6), and one Hf(9) atom. In the eleventh N site, N(11) is bonded in a 5-coordinate geometry to one Hf(10), one Hf(13), one Hf(14), one Hf(8), and one N(14) atom. In the twelfth N site, N(12) is bonded to one Hf(12), one Hf(14), one Hf(2), and one Hf(9) atom to form distorted NHf4 trigonal pyramids that share  an edgeedge with one O(4)Hf5 square pyramid. In the thirteenth N site, N(13) is bonded in a 1-coordinate geometry to one Hf(11), one Hf(15), and one Hf(5) atom. In the fourteenth N site, N(14) is bonded in a single-bond geometry to one Hf(14) and one N(11) atom. In the fifteenth N site, N(15) is bonded in a 3-coordinate geometry to one Hf(2), one Hf(7), and one N(3) atom. In the sixteenth N site, N(16) is bonded in a 5-coordinate geometry to one Hf(1), one Hf(10), one Hf(11), one Hf(14), and one Hf(16) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Hf(14) and one Hf(7) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Hf(4), one Hf(7), and one N(7) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Hf(16) and one Hf(8) atom. In the fourth O site, O(4) is bonded to one Hf(1), one Hf(12), one Hf(2), one Hf(4), and one Hf(6) atom to form distorted OHf5 square pyramids that share  an edgeedge with one N(12)Hf4 trigonal pyramid. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Hf(11), one Hf(16), one Hf(4), and one Hf(9) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Hf(1), one Hf(13), and one Hf(6) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Hf(4), one Hf(5), one Hf(8), and one N(5) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Hf(12), one Hf(13), and one Hf(3) atom. is represented by the CIF card [CIF]
data_Hf2N2O
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.705
_cell_length_b   8.721
_cell_length_c   8.751
_cell_angle_alpha   109.610
_cell_angle_beta   109.340
_cell_angle_gamma   109.256
_symmetry_Int_Tables_number   1
_cell_volume   512.674
_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  0.502  0.491  0.499  1.0
  Hf  Hf1  1  0.286  0.829  0.463  1.0
  Hf  Hf2  1  0.973  0.222  0.249  1.0
  Hf  Hf3  1  0.446  0.696  0.258  1.0
  Hf  Hf4  1  0.224  0.180  0.035  1.0
  Hf  Hf5  1  0.336  0.560  0.706  1.0
  Hf  Hf6  1  0.026  0.022  0.487  1.0
  Hf  Hf7  1  0.002  0.515  0.994  1.0
  Hf  Hf8  1  0.478  0.986  0.012  1.0
  Hf  Hf9  1  0.682  0.455  0.285  1.0
  Hf  Hf10  1  0.312  0.034  0.216  1.0
  Hf  Hf11  1  0.681  0.963  0.785  1.0
  Hf  Hf12  1  0.776  0.812  0.966  1.0
  Hf  Hf13  1  0.537  0.282  0.750  1.0
  Hf  Hf14  1  0.037  0.788  0.749  1.0
  Hf  Hf15  1  0.714  0.178  0.537  1.0
  N  N16  1  0.995  0.967  0.272  1.0
  N  N17  1  0.781  0.307  0.230  1.0
  N  N18  1  0.018  0.785  0.470  1.0
  N  N19  1  0.192  0.700  0.268  1.0
  N  N20  1  0.421  0.684  0.044  1.0
  N  N21  1  0.008  0.044  0.724  1.0
  N  N22  1  0.516  0.506  0.226  1.0
  N  N23  1  0.813  0.049  0.457  1.0
  N  N24  1  0.980  0.205  0.534  1.0
  N  N25  1  0.209  0.672  0.778  1.0
  N  N26  1  0.744  0.517  0.016  1.0
  N  N27  1  0.458  0.007  0.767  1.0
  N  N28  1  0.196  0.927  0.032  1.0
  N  N29  1  0.581  0.322  0.952  1.0
  N  N30  1  0.180  0.938  0.547  1.0
  N  N31  1  0.565  0.293  0.485  1.0
  O  O32  1  0.304  0.263  0.734  1.0
  O  O33  1  0.694  0.747  0.267  1.0
  O  O34  1  0.823  0.308  0.726  1.0
  O  O35  1  0.416  0.693  0.526  1.0
  O  O36  1  0.543  0.989  0.236  1.0
  O  O37  1  0.472  0.491  0.779  1.0
  O  O38  1  0.266  0.488  0.978  1.0
  O  O39  1  0.814  0.084  0.960  1.0
[/CIF]
.