The structure described by Hf(O4Cl)4 is Indium-like structured and crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four Hf(O4Cl)4 clusters. Hf(1) is bonded to one O(1), one O(13), one O(16), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted HfO8 hexagonal bipyramids that share  an edgeedge with one Cl(2)O4 tetrahedra;  an edgeedge with one Cl(3)O4 tetrahedra; and edges with two equivalent Cl(1,4)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Hf(1) and one Cl(3) atom. In the second O site, O(2,14) is bonded in a single-bond geometry to one Cl(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Cl(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Hf(1) and one Cl(2) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Cl(1,4) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Hf(1) and one Cl(3) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Cl(1,4) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Cl(1,4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Cl(3) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Hf(1) and one Cl(2) atom. In the fourteenth O site, O(15) is bonded in a single-bond geometry to one Cl(1,4) atom. In the fifteenth O site, O(16) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. There are three inequivalent Cl sites. In the first Cl site, Cl(1,4) is bonded to one O(10), one O(11), one O(16), and one O(6) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. In the second Cl site, Cl(2) is bonded to one O(13); one O(2,14); one O(3); and one O(5) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. In the third Cl site, Cl(3) is bonded to one O(1); one O(12); one O(2,14); and one O(9) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. is represented by the CIF file [CIF]
data_Hf(ClO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.474
_cell_length_b   7.474
_cell_length_c   13.197
_cell_angle_alpha   73.552
_cell_angle_beta   73.552
_cell_angle_gamma   62.854
_symmetry_Int_Tables_number   1
_cell_volume   618.897
_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
  Hf  Hf0  1  0.596  0.651  0.411  1.0
  Hf  Hf1  1  0.651  0.596  0.911  1.0
  Cl  Cl2  1  0.288  0.846  0.575  1.0
  Cl  Cl3  1  0.602  0.004  0.821  1.0
  Cl  Cl4  1  0.248  0.634  0.005  1.0
  Cl  Cl5  1  0.412  0.954  0.241  1.0
  Cl  Cl6  1  0.634  0.248  0.505  1.0
  Cl  Cl7  1  0.846  0.288  0.075  1.0
  Cl  Cl8  1  0.004  0.602  0.321  1.0
  Cl  Cl9  1  0.954  0.412  0.741  1.0
  O  O10  1  0.387  0.699  0.036  1.0
  O  O11  1  0.760  0.038  0.742  1.0
  O  O12  1  0.181  0.433  0.347  1.0
  O  O13  1  0.962  0.516  0.823  1.0
  O  O14  1  0.685  0.865  0.920  1.0
  O  O15  1  0.738  0.283  0.995  1.0
  O  O16  1  0.518  0.991  0.137  1.0
  O  O17  1  0.445  0.732  0.275  1.0
  O  O18  1  0.559  0.384  0.403  1.0
  O  O19  1  0.056  0.164  0.053  1.0
  O  O20  1  0.283  0.738  0.495  1.0
  O  O21  1  0.246  0.747  0.680  1.0
  O  O22  1  0.068  0.802  0.982  1.0
  O  O23  1  0.699  0.387  0.536  1.0
  O  O24  1  0.537  0.865  0.789  1.0
  O  O25  1  0.471  0.221  0.582  1.0
  O  O26  1  0.865  0.685  0.420  1.0
  O  O27  1  0.082  0.204  0.760  1.0
  O  O28  1  0.809  0.512  0.044  1.0
  O  O29  1  0.433  0.181  0.847  1.0
  O  O30  1  0.384  0.559  0.903  1.0
  O  O31  1  0.802  0.068  0.482  1.0
  O  O32  1  0.732  0.445  0.775  1.0
  O  O33  1  0.991  0.518  0.637  1.0
  O  O34  1  0.164  0.056  0.553  1.0
  O  O35  1  0.221  0.471  0.082  1.0
  O  O36  1  0.747  0.246  0.180  1.0
  O  O37  1  0.516  0.962  0.323  1.0
  O  O38  1  0.512  0.809  0.544  1.0
  O  O39  1  0.204  0.082  0.260  1.0
  O  O40  1  0.038  0.760  0.242  1.0
  O  O41  1  0.865  0.537  0.289  1.0
[/CIF]
.
The structure described by Hf(O4Cl)4 is Indium-like structured and crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four Hf(O4Cl)4 clusters. Hf(1) is bonded to one O(1), one O(13), one O(16), one O(4), one O(5), one O(6), one O(8), and one O(9) atom to form distorted HfO8 hexagonal bipyramids that share  an edgeedge with one Cl(2)O4 tetrahedra;  an edgeedge with one Cl(3)O4 tetrahedra; and edges with two equivalent Cl(1,4)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Hf(1) and one Cl(3) atom. In the second O site, O(2,14) is bonded in a single-bond geometry to one Cl(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Cl(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Hf(1) and one Cl(2) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Cl(1,4) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Hf(1) and one Cl(3) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Cl(1,4) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Cl(1,4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Cl(3) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Hf(1) and one Cl(2) atom. In the fourteenth O site, O(15) is bonded in a single-bond geometry to one Cl(1,4) atom. In the fifteenth O site, O(16) is bonded in a water-like geometry to one Hf(1) and one Cl(1,4) atom. There are three inequivalent Cl sites. In the first Cl site, Cl(1,4) is bonded to one O(10), one O(11), one O(16), and one O(6) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. In the second Cl site, Cl(2) is bonded to one O(13); one O(2,14); one O(3); and one O(5) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. In the third Cl site, Cl(3) is bonded to one O(1); one O(12); one O(2,14); and one O(9) atom to form ClO4 tetrahedra that share  an edgeedge with one Hf(1)O8 hexagonal bipyramid. is represented by the CIF file [CIF]
data_Hf(ClO4)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.474
_cell_length_b   7.474
_cell_length_c   13.197
_cell_angle_alpha   73.552
_cell_angle_beta   73.552
_cell_angle_gamma   62.854
_symmetry_Int_Tables_number   1
_cell_volume   618.897
_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
  Hf  Hf0  1  0.596  0.651  0.411  1.0
  Hf  Hf1  1  0.651  0.596  0.911  1.0
  Cl  Cl2  1  0.288  0.846  0.575  1.0
  Cl  Cl3  1  0.602  0.004  0.821  1.0
  Cl  Cl4  1  0.248  0.634  0.005  1.0
  Cl  Cl5  1  0.412  0.954  0.241  1.0
  Cl  Cl6  1  0.634  0.248  0.505  1.0
  Cl  Cl7  1  0.846  0.288  0.075  1.0
  Cl  Cl8  1  0.004  0.602  0.321  1.0
  Cl  Cl9  1  0.954  0.412  0.741  1.0
  O  O10  1  0.387  0.699  0.036  1.0
  O  O11  1  0.760  0.038  0.742  1.0
  O  O12  1  0.181  0.433  0.347  1.0
  O  O13  1  0.962  0.516  0.823  1.0
  O  O14  1  0.685  0.865  0.920  1.0
  O  O15  1  0.738  0.283  0.995  1.0
  O  O16  1  0.518  0.991  0.137  1.0
  O  O17  1  0.445  0.732  0.275  1.0
  O  O18  1  0.559  0.384  0.403  1.0
  O  O19  1  0.056  0.164  0.053  1.0
  O  O20  1  0.283  0.738  0.495  1.0
  O  O21  1  0.246  0.747  0.680  1.0
  O  O22  1  0.068  0.802  0.982  1.0
  O  O23  1  0.699  0.387  0.536  1.0
  O  O24  1  0.537  0.865  0.789  1.0
  O  O25  1  0.471  0.221  0.582  1.0
  O  O26  1  0.865  0.685  0.420  1.0
  O  O27  1  0.082  0.204  0.760  1.0
  O  O28  1  0.809  0.512  0.044  1.0
  O  O29  1  0.433  0.181  0.847  1.0
  O  O30  1  0.384  0.559  0.903  1.0
  O  O31  1  0.802  0.068  0.482  1.0
  O  O32  1  0.732  0.445  0.775  1.0
  O  O33  1  0.991  0.518  0.637  1.0
  O  O34  1  0.164  0.056  0.553  1.0
  O  O35  1  0.221  0.471  0.082  1.0
  O  O36  1  0.747  0.246  0.180  1.0
  O  O37  1  0.516  0.962  0.323  1.0
  O  O38  1  0.512  0.809  0.544  1.0
  O  O39  1  0.204  0.082  0.260  1.0
  O  O40  1  0.038  0.760  0.242  1.0
  O  O41  1  0.865  0.537  0.289  1.0
[/CIF]
.