The material described by K2Ni(NO3)4 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(11), one O(5), one O(7), one O(8), one O(9), two equivalent O(12), and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(5), one O(6), one O(8), one O(9), and two equivalent O(3) atoms. Ni(1) is bonded in an octahedral geometry to one O(11), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(7) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(9) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one O(10), one O(5), and one O(6) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one O(11), one O(3), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one Ni(1), and one N(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent K(2) and one N(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ni(1) and one N(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(2), one Ni(1), and one N(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one Ni(1), and one N(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ni(1), and one N(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one N(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ni(1), and one N(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(1) atom. is represented by the CIF file [CIF]
data_K2Ni(NO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.265
_cell_length_b   9.265
_cell_length_c   9.238
_cell_angle_alpha   82.582
_cell_angle_beta   82.582
_cell_angle_gamma   45.685
_symmetry_Int_Tables_number   1
_cell_volume   561.831
_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
  K  K0  1  0.895  0.588  0.283  1.0
  K  K1  1  0.588  0.895  0.783  1.0
  K  K2  1  0.570  0.311  0.351  1.0
  K  K3  1  0.311  0.570  0.851  1.0
  Ni  Ni4  1  0.966  0.274  0.676  1.0
  Ni  Ni5  1  0.274  0.966  0.176  1.0
  N  N6  1  0.999  0.333  0.975  1.0
  N  N7  1  0.460  0.131  0.096  1.0
  N  N8  1  0.014  0.867  0.213  1.0
  N  N9  1  0.333  0.999  0.475  1.0
  N  N10  1  0.617  0.507  0.585  1.0
  N  N11  1  0.507  0.617  0.085  1.0
  N  N12  1  0.131  0.460  0.596  1.0
  N  N13  1  0.867  0.014  0.713  1.0
  O  O14  1  0.377  0.233  0.207  1.0
  O  O15  1  0.492  0.969  0.095  1.0
  O  O16  1  0.969  0.492  0.595  1.0
  O  O17  1  0.606  0.445  0.049  1.0
  O  O18  1  0.202  0.071  0.383  1.0
  O  O19  1  0.155  0.701  0.156  1.0
  O  O20  1  0.034  0.988  0.232  1.0
  O  O21  1  0.701  0.155  0.656  1.0
  O  O22  1  0.059  0.269  0.106  1.0
  O  O23  1  0.508  0.653  0.215  1.0
  O  O24  1  0.176  0.515  0.483  1.0
  O  O25  1  0.923  0.847  0.754  1.0
  O  O26  1  0.071  0.202  0.883  1.0
  O  O27  1  0.393  0.774  0.997  1.0
  O  O28  1  0.518  0.875  0.444  1.0
  O  O29  1  0.847  0.923  0.254  1.0
  O  O30  1  0.515  0.176  0.983  1.0
  O  O31  1  0.988  0.034  0.732  1.0
  O  O32  1  0.774  0.393  0.497  1.0
  O  O33  1  0.653  0.508  0.715  1.0
  O  O34  1  0.875  0.518  0.944  1.0
  O  O35  1  0.269  0.059  0.606  1.0
  O  O36  1  0.233  0.377  0.707  1.0
  O  O37  1  0.445  0.606  0.549  1.0
[/CIF]
.
The material described by K2Ni(NO3)4 crystallizes in the monoclinic Cc space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 11-coordinate geometry to one O(1), one O(10), one O(11), one O(5), one O(7), one O(8), one O(9), two equivalent O(12), and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(5), one O(6), one O(8), one O(9), and two equivalent O(3) atoms. Ni(1) is bonded in an octahedral geometry to one O(11), one O(2), one O(4), one O(6), one O(7), and one O(8) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one O(12), one O(4), and one O(7) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(9) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one O(10), one O(5), and one O(6) atom. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one O(11), one O(3), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to two equivalent K(1), one Ni(1), and one N(2) atom. In the third O site, O(3) is bonded in a single-bond geometry to two equivalent K(2) and one N(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ni(1) and one N(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(2), one Ni(1), and one N(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one K(1), one Ni(1), and one N(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ni(1), and one N(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one N(2) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one N(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one K(1), one K(2), one Ni(1), and one N(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(1) atom. is represented by the CIF file [CIF]
data_K2Ni(NO3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.265
_cell_length_b   9.265
_cell_length_c   9.238
_cell_angle_alpha   82.582
_cell_angle_beta   82.582
_cell_angle_gamma   45.685
_symmetry_Int_Tables_number   1
_cell_volume   561.831
_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
  K  K0  1  0.895  0.588  0.283  1.0
  K  K1  1  0.588  0.895  0.783  1.0
  K  K2  1  0.570  0.311  0.351  1.0
  K  K3  1  0.311  0.570  0.851  1.0
  Ni  Ni4  1  0.966  0.274  0.676  1.0
  Ni  Ni5  1  0.274  0.966  0.176  1.0
  N  N6  1  0.999  0.333  0.975  1.0
  N  N7  1  0.460  0.131  0.096  1.0
  N  N8  1  0.014  0.867  0.213  1.0
  N  N9  1  0.333  0.999  0.475  1.0
  N  N10  1  0.617  0.507  0.585  1.0
  N  N11  1  0.507  0.617  0.085  1.0
  N  N12  1  0.131  0.460  0.596  1.0
  N  N13  1  0.867  0.014  0.713  1.0
  O  O14  1  0.377  0.233  0.207  1.0
  O  O15  1  0.492  0.969  0.095  1.0
  O  O16  1  0.969  0.492  0.595  1.0
  O  O17  1  0.606  0.445  0.049  1.0
  O  O18  1  0.202  0.071  0.383  1.0
  O  O19  1  0.155  0.701  0.156  1.0
  O  O20  1  0.034  0.988  0.232  1.0
  O  O21  1  0.701  0.155  0.656  1.0
  O  O22  1  0.059  0.269  0.106  1.0
  O  O23  1  0.508  0.653  0.215  1.0
  O  O24  1  0.176  0.515  0.483  1.0
  O  O25  1  0.923  0.847  0.754  1.0
  O  O26  1  0.071  0.202  0.883  1.0
  O  O27  1  0.393  0.774  0.997  1.0
  O  O28  1  0.518  0.875  0.444  1.0
  O  O29  1  0.847  0.923  0.254  1.0
  O  O30  1  0.515  0.176  0.983  1.0
  O  O31  1  0.988  0.034  0.732  1.0
  O  O32  1  0.774  0.393  0.497  1.0
  O  O33  1  0.653  0.508  0.715  1.0
  O  O34  1  0.875  0.518  0.944  1.0
  O  O35  1  0.269  0.059  0.606  1.0
  O  O36  1  0.233  0.377  0.707  1.0
  O  O37  1  0.445  0.606  0.549  1.0
[/CIF]
.