The compound described by (Ni6Se4O15)2O2 crystallizes in the orthorhombic Cmc2_1 space group. The structure consists of four water atoms inside a Ni6Se4O15 framework. In the Ni6Se4O15 framework, there are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(6), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 29-59°. In the second Ni site, Ni(2) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(9) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 22-59°. In the third Ni site, Ni(3) is bonded to one O(1), one O(3), one O(5), one O(7), and two equivalent O(9) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 22-60°. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(5) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the third Se site, Se(3) is bonded in a distorted T-shaped geometry to one O(6) and two equivalent O(7) atoms. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Ni(1) atoms. In the second O site, O(9) is bonded in a rectangular see-saw-like geometry to two equivalent Ni(2) and two equivalent Ni(3) atoms. In the third O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ni(3) and one Se(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Se(2) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to one Ni(2), one Ni(3), and one Se(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one Se(2) atom. In the seventh O site, O(5) is bonded in a distorted trigonal planar geometry to one Ni(2), one Ni(3), and one Se(1) atom. In the eighth O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Ni(1) and one Se(3) atom. In the ninth O site, O(7) is bonded in a trigonal non-coplanar geometry to one Ni(2), one Ni(3), and one Se(3) atom. is represented by the CIF card [CIF]
data_Ni3(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.829
_cell_length_b   12.977
_cell_length_c   12.977
_cell_angle_alpha   119.826
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   705.562
_cell_formula_units_Z   4
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  0.530  0.432  0.357  1.0
  Ni  Ni1  1  0.530  0.922  0.568  1.0
  Ni  Ni2  1  0.530  0.645  0.077  1.0
  Ni  Ni3  1  0.530  0.923  0.355  1.0
  Ni  Ni4  1  0.530  0.643  0.568  1.0
  Ni  Ni5  1  0.530  0.432  0.078  1.0
  Ni  Ni6  1  0.030  0.568  0.643  1.0
  Ni  Ni7  1  0.030  0.078  0.432  1.0
  Ni  Ni8  1  0.030  0.355  0.923  1.0
  Ni  Ni9  1  0.030  0.077  0.645  1.0
  Ni  Ni10  1  0.030  0.357  0.432  1.0
  Ni  Ni11  1  0.030  0.568  0.922  1.0
  Se  Se12  1  0.483  0.146  0.854  1.0
  Se  Se13  1  0.483  0.707  0.853  1.0
  Se  Se14  1  0.483  0.147  0.293  1.0
  Se  Se15  1  0.983  0.854  0.146  1.0
  Se  Se16  1  0.983  0.293  0.147  1.0
  Se  Se17  1  0.983  0.853  0.707  1.0
  Se  Se18  1  0.583  0.666  0.334  1.0
  Se  Se19  1  0.083  0.334  0.666  1.0
  O  O20  1  0.239  0.205  0.795  1.0
  O  O21  1  0.238  0.591  0.795  1.0
  O  O22  1  0.238  0.205  0.409  1.0
  O  O23  1  0.739  0.795  0.205  1.0
  O  O24  1  0.738  0.409  0.205  1.0
  O  O25  1  0.738  0.795  0.591  1.0
  O  O26  1  0.191  0.332  0.062  1.0
  O  O27  1  0.192  0.730  0.668  1.0
  O  O28  1  0.192  0.938  0.269  1.0
  O  O29  1  0.192  0.731  0.062  1.0
  O  O30  1  0.191  0.938  0.668  1.0
  O  O31  1  0.192  0.332  0.270  1.0
  O  O32  1  0.691  0.668  0.938  1.0
  O  O33  1  0.692  0.270  0.332  1.0
  O  O34  1  0.692  0.062  0.731  1.0
  O  O35  1  0.692  0.269  0.938  1.0
  O  O36  1  0.691  0.062  0.332  1.0
  O  O37  1  0.692  0.668  0.730  1.0
  O  O38  1  0.900  0.401  0.599  1.0
  O  O39  1  0.904  0.200  0.600  1.0
  O  O40  1  0.904  0.400  0.800  1.0
  O  O41  1  0.400  0.599  0.401  1.0
  O  O42  1  0.404  0.800  0.400  1.0
  O  O43  1  0.404  0.600  0.200  1.0
  O  O44  1  0.337  0.480  0.520  1.0
  O  O45  1  0.325  0.029  0.514  1.0
  O  O46  1  0.325  0.486  0.971  1.0
  O  O47  1  0.837  0.520  0.480  1.0
  O  O48  1  0.825  0.971  0.486  1.0
  O  O49  1  0.825  0.514  0.029  1.0
  O  O50  1  0.389  1.000  0.000  1.0
  O  O51  1  0.889  0.000  1.000  1.0
[/CIF]
.
The compound described by (Ni6Se4O15)2O2 crystallizes in the orthorhombic Cmc2_1 space group. The structure consists of four water atoms inside a Ni6Se4O15 framework. In the Ni6Se4O15 framework, there are three inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(2), one O(6), two equivalent O(4), and two equivalent O(8) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 29-59°. In the second Ni site, Ni(2) is bonded to one O(2), one O(3), one O(5), one O(7), and two equivalent O(9) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 22-59°. In the third Ni site, Ni(3) is bonded to one O(1), one O(3), one O(5), one O(7), and two equivalent O(9) atoms to form a mixture of face, corner, and edge-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 22-60°. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1) and two equivalent O(5) atoms. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2), one O(3), and one O(4) atom. In the third Se site, Se(3) is bonded in a distorted T-shaped geometry to one O(6) and two equivalent O(7) atoms. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Ni(1) atoms. In the second O site, O(9) is bonded in a rectangular see-saw-like geometry to two equivalent Ni(2) and two equivalent Ni(3) atoms. In the third O site, O(1) is bonded in a trigonal planar geometry to two equivalent Ni(3) and one Se(1) atom. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Ni(1), one Ni(2), and one Se(2) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to one Ni(2), one Ni(3), and one Se(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Ni(1) and one Se(2) atom. In the seventh O site, O(5) is bonded in a distorted trigonal planar geometry to one Ni(2), one Ni(3), and one Se(1) atom. In the eighth O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Ni(1) and one Se(3) atom. In the ninth O site, O(7) is bonded in a trigonal non-coplanar geometry to one Ni(2), one Ni(3), and one Se(3) atom. is represented by the CIF card [CIF]
data_Ni3(SeO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.829
_cell_length_b   12.977
_cell_length_c   12.977
_cell_angle_alpha   119.826
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   705.562
_cell_formula_units_Z   4
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  0.530  0.432  0.357  1.0
  Ni  Ni1  1  0.530  0.922  0.568  1.0
  Ni  Ni2  1  0.530  0.645  0.077  1.0
  Ni  Ni3  1  0.530  0.923  0.355  1.0
  Ni  Ni4  1  0.530  0.643  0.568  1.0
  Ni  Ni5  1  0.530  0.432  0.078  1.0
  Ni  Ni6  1  0.030  0.568  0.643  1.0
  Ni  Ni7  1  0.030  0.078  0.432  1.0
  Ni  Ni8  1  0.030  0.355  0.923  1.0
  Ni  Ni9  1  0.030  0.077  0.645  1.0
  Ni  Ni10  1  0.030  0.357  0.432  1.0
  Ni  Ni11  1  0.030  0.568  0.922  1.0
  Se  Se12  1  0.483  0.146  0.854  1.0
  Se  Se13  1  0.483  0.707  0.853  1.0
  Se  Se14  1  0.483  0.147  0.293  1.0
  Se  Se15  1  0.983  0.854  0.146  1.0
  Se  Se16  1  0.983  0.293  0.147  1.0
  Se  Se17  1  0.983  0.853  0.707  1.0
  Se  Se18  1  0.583  0.666  0.334  1.0
  Se  Se19  1  0.083  0.334  0.666  1.0
  O  O20  1  0.239  0.205  0.795  1.0
  O  O21  1  0.238  0.591  0.795  1.0
  O  O22  1  0.238  0.205  0.409  1.0
  O  O23  1  0.739  0.795  0.205  1.0
  O  O24  1  0.738  0.409  0.205  1.0
  O  O25  1  0.738  0.795  0.591  1.0
  O  O26  1  0.191  0.332  0.062  1.0
  O  O27  1  0.192  0.730  0.668  1.0
  O  O28  1  0.192  0.938  0.269  1.0
  O  O29  1  0.192  0.731  0.062  1.0
  O  O30  1  0.191  0.938  0.668  1.0
  O  O31  1  0.192  0.332  0.270  1.0
  O  O32  1  0.691  0.668  0.938  1.0
  O  O33  1  0.692  0.270  0.332  1.0
  O  O34  1  0.692  0.062  0.731  1.0
  O  O35  1  0.692  0.269  0.938  1.0
  O  O36  1  0.691  0.062  0.332  1.0
  O  O37  1  0.692  0.668  0.730  1.0
  O  O38  1  0.900  0.401  0.599  1.0
  O  O39  1  0.904  0.200  0.600  1.0
  O  O40  1  0.904  0.400  0.800  1.0
  O  O41  1  0.400  0.599  0.401  1.0
  O  O42  1  0.404  0.800  0.400  1.0
  O  O43  1  0.404  0.600  0.200  1.0
  O  O44  1  0.337  0.480  0.520  1.0
  O  O45  1  0.325  0.029  0.514  1.0
  O  O46  1  0.325  0.486  0.971  1.0
  O  O47  1  0.837  0.520  0.480  1.0
  O  O48  1  0.825  0.971  0.486  1.0
  O  O49  1  0.825  0.514  0.029  1.0
  O  O50  1  0.389  1.000  0.000  1.0
  O  O51  1  0.889  0.000  1.000  1.0
[/CIF]
.