The crystal structure described by Na4Mg(CuO2)2 crystallizes in the monoclinic Pm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 2-coordinate geometry to two equivalent O(2) and two equivalent O(4) atoms. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(1) atoms. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(2) atoms. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted L-shaped geometry to two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(4), two equivalent Na(3), and two equivalent Mg(1) atoms to form distorted ONa3Mg2 trigonal bipyramids that share corners with two equivalent O(4)Na4Cu2 octahedra, corners with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids,  an edgeedge with one O(3)Na2Mg2Cu2 pentagonal pyramid, and edges with two equivalent O(1)Na3Mg2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), two equivalent Na(2), two equivalent Na(4), and two equivalent Cu(2) atoms. In the third O site, O(3) is bonded to two equivalent Na(1), two equivalent Mg(1), and two equivalent Cu(1) atoms to form distorted ONa2Mg2Cu2 pentagonal pyramids that share corners with two equivalent O(4)Na4Cu2 octahedra, corners with two equivalent O(1)Na3Mg2 trigonal bipyramids,  an edgeedge with one O(1)Na3Mg2 trigonal bipyramid, and faces with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids. The corner-sharing octahedral tilt angles are 61°. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), two equivalent Na(2), and two equivalent Cu(2) atoms to form ONa4Cu2 octahedra that share corners with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids, corners with two equivalent O(1)Na3Mg2 trigonal bipyramids, and edges with two equivalent O(4)Na4Cu2 octahedra. is represented by the CIF file [CIF]
data_Na4Mg(CuO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.937
_cell_length_b   5.265
_cell_length_c   10.278
_cell_angle_alpha   98.201
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   157.302
_cell_formula_units_Z   1
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
  Na  Na0  1  0.750  0.741  0.965  1.0
  Na  Na1  1  0.250  0.331  0.136  1.0
  Na  Na2  1  0.750  0.554  0.395  1.0
  Na  Na3  1  0.250  0.096  0.515  1.0
  Mg  Mg4  1  0.750  0.641  0.685  1.0
  Cu  Cu5  1  0.750  0.227  0.836  1.0
  Cu  Cu6  1  0.250  0.893  0.247  1.0
  O  O7  1  0.250  0.672  0.560  1.0
  O  O8  1  0.750  0.115  0.327  1.0
  O  O9  1  0.250  0.495  0.807  1.0
  O  O10  1  0.750  0.663  0.175  1.0
[/CIF]
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The crystal structure described by Na4Mg(CuO2)2 crystallizes in the monoclinic Pm space group. There are four inequivalent Na sites. In the first Na site, Na(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded in a 2-coordinate geometry to two equivalent O(2) and two equivalent O(4) atoms. In the third Na site, Na(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(4), and two equivalent O(1) atoms. In the fourth Na site, Na(4) is bonded in a 3-coordinate geometry to one O(1) and two equivalent O(2) atoms. Mg(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(3) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted L-shaped geometry to two equivalent O(3) atoms. In the second Cu site, Cu(2) is bonded in a distorted square co-planar geometry to two equivalent O(2) and two equivalent O(4) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded to one Na(4), two equivalent Na(3), and two equivalent Mg(1) atoms to form distorted ONa3Mg2 trigonal bipyramids that share corners with two equivalent O(4)Na4Cu2 octahedra, corners with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids,  an edgeedge with one O(3)Na2Mg2Cu2 pentagonal pyramid, and edges with two equivalent O(1)Na3Mg2 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°. In the second O site, O(2) is bonded in a 7-coordinate geometry to one Na(3), two equivalent Na(2), two equivalent Na(4), and two equivalent Cu(2) atoms. In the third O site, O(3) is bonded to two equivalent Na(1), two equivalent Mg(1), and two equivalent Cu(1) atoms to form distorted ONa2Mg2Cu2 pentagonal pyramids that share corners with two equivalent O(4)Na4Cu2 octahedra, corners with two equivalent O(1)Na3Mg2 trigonal bipyramids,  an edgeedge with one O(1)Na3Mg2 trigonal bipyramid, and faces with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids. The corner-sharing octahedral tilt angles are 61°. In the fourth O site, O(4) is bonded to one Na(1), one Na(3), two equivalent Na(2), and two equivalent Cu(2) atoms to form ONa4Cu2 octahedra that share corners with two equivalent O(3)Na2Mg2Cu2 pentagonal pyramids, corners with two equivalent O(1)Na3Mg2 trigonal bipyramids, and edges with two equivalent O(4)Na4Cu2 octahedra. is represented by the CIF file [CIF]
data_Na4Mg(CuO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.937
_cell_length_b   5.265
_cell_length_c   10.278
_cell_angle_alpha   98.201
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   157.302
_cell_formula_units_Z   1
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
  Na  Na0  1  0.750  0.741  0.965  1.0
  Na  Na1  1  0.250  0.331  0.136  1.0
  Na  Na2  1  0.750  0.554  0.395  1.0
  Na  Na3  1  0.250  0.096  0.515  1.0
  Mg  Mg4  1  0.750  0.641  0.685  1.0
  Cu  Cu5  1  0.750  0.227  0.836  1.0
  Cu  Cu6  1  0.250  0.893  0.247  1.0
  O  O7  1  0.250  0.672  0.560  1.0
  O  O8  1  0.750  0.115  0.327  1.0
  O  O9  1  0.250  0.495  0.807  1.0
  O  O10  1  0.750  0.663  0.175  1.0
[/CIF]
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