The structure described by NaCo3As3(HO6)2 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a distorted square co-planar geometry to two equivalent O(3) and four equivalent O(6) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra and corners with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra and corners with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-60°. H(1) is bonded in a linear geometry to one O(2) and one O(4) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(2), one As(1), and one H(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Co(1), one Co(2), and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Co(1), one As(2), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one As(2) atom. In the sixth O site, O(6) is bonded to two equivalent Na(1), one Co(2), and one As(2) atom to form a mixture of distorted edge and corner-sharing ONa2CoAs trigonal pyramids. is represented by the CIF file [CIF]
data_NaCo3As3(HO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.726
_cell_length_b   8.726
_cell_length_c   6.911
_cell_angle_alpha   74.070
_cell_angle_beta   74.070
_cell_angle_gamma   91.448
_symmetry_Int_Tables_number   1
_cell_volume   483.711
_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
  Na  Na0  1  0.996  0.004  0.750  1.0
  Na  Na1  1  0.004  0.996  0.250  1.0
  Co  Co2  1  0.722  0.278  0.250  1.0
  Co  Co3  1  0.278  0.722  0.750  1.0
  Co  Co4  1  0.045  0.369  0.385  1.0
  Co  Co5  1  0.631  0.955  0.115  1.0
  Co  Co6  1  0.955  0.631  0.615  1.0
  Co  Co7  1  0.369  0.045  0.885  1.0
  As  As8  1  0.315  0.685  0.250  1.0
  As  As9  1  0.685  0.315  0.750  1.0
  As  As10  1  0.896  0.667  0.112  1.0
  As  As11  1  0.333  0.104  0.388  1.0
  As  As12  1  0.104  0.333  0.888  1.0
  As  As13  1  0.667  0.896  0.612  1.0
  H  H14  1  0.618  0.609  0.196  1.0
  H  H15  1  0.391  0.382  0.304  1.0
  H  H16  1  0.382  0.391  0.804  1.0
  H  H17  1  0.609  0.618  0.696  1.0
  O  O18  1  0.798  0.272  0.525  1.0
  O  O19  1  0.728  0.202  0.975  1.0
  O  O20  1  0.202  0.728  0.475  1.0
  O  O21  1  0.272  0.798  0.025  1.0
  O  O22  1  0.281  0.484  0.273  1.0
  O  O23  1  0.516  0.719  0.227  1.0
  O  O24  1  0.719  0.516  0.727  1.0
  O  O25  1  0.484  0.281  0.773  1.0
  O  O26  1  0.975  0.331  0.128  1.0
  O  O27  1  0.669  0.025  0.372  1.0
  O  O28  1  0.025  0.669  0.872  1.0
  O  O29  1  0.331  0.975  0.628  1.0
  O  O30  1  0.463  0.279  0.335  1.0
  O  O31  1  0.721  0.537  0.165  1.0
  O  O32  1  0.537  0.721  0.665  1.0
  O  O33  1  0.279  0.463  0.835  1.0
  O  O34  1  0.978  0.601  0.314  1.0
  O  O35  1  0.399  0.022  0.186  1.0
  O  O36  1  0.022  0.399  0.686  1.0
  O  O37  1  0.601  0.978  0.814  1.0
  O  O38  1  0.141  0.151  0.407  1.0
  O  O39  1  0.849  0.859  0.093  1.0
  O  O40  1  0.859  0.849  0.593  1.0
  O  O41  1  0.151  0.141  0.907  1.0
[/CIF]
.
The structure described by NaCo3As3(HO6)2 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a distorted square co-planar geometry to two equivalent O(3) and four equivalent O(6) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to one O(1), one O(2), one O(3), one O(6), and two equivalent O(5) atoms to form CoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra, corners with four equivalent As(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form AsO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra and corners with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 54-60°. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form AsO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra and corners with four equivalent Co(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-60°. H(1) is bonded in a linear geometry to one O(2) and one O(4) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Co(2), one As(1), and one H(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(1), one Co(1), one Co(2), and one As(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Co(1), one As(2), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one As(2) atom. In the sixth O site, O(6) is bonded to two equivalent Na(1), one Co(2), and one As(2) atom to form a mixture of distorted edge and corner-sharing ONa2CoAs trigonal pyramids. is represented by the CIF file [CIF]
data_NaCo3As3(HO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.726
_cell_length_b   8.726
_cell_length_c   6.911
_cell_angle_alpha   74.070
_cell_angle_beta   74.070
_cell_angle_gamma   91.448
_symmetry_Int_Tables_number   1
_cell_volume   483.711
_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
  Na  Na0  1  0.996  0.004  0.750  1.0
  Na  Na1  1  0.004  0.996  0.250  1.0
  Co  Co2  1  0.722  0.278  0.250  1.0
  Co  Co3  1  0.278  0.722  0.750  1.0
  Co  Co4  1  0.045  0.369  0.385  1.0
  Co  Co5  1  0.631  0.955  0.115  1.0
  Co  Co6  1  0.955  0.631  0.615  1.0
  Co  Co7  1  0.369  0.045  0.885  1.0
  As  As8  1  0.315  0.685  0.250  1.0
  As  As9  1  0.685  0.315  0.750  1.0
  As  As10  1  0.896  0.667  0.112  1.0
  As  As11  1  0.333  0.104  0.388  1.0
  As  As12  1  0.104  0.333  0.888  1.0
  As  As13  1  0.667  0.896  0.612  1.0
  H  H14  1  0.618  0.609  0.196  1.0
  H  H15  1  0.391  0.382  0.304  1.0
  H  H16  1  0.382  0.391  0.804  1.0
  H  H17  1  0.609  0.618  0.696  1.0
  O  O18  1  0.798  0.272  0.525  1.0
  O  O19  1  0.728  0.202  0.975  1.0
  O  O20  1  0.202  0.728  0.475  1.0
  O  O21  1  0.272  0.798  0.025  1.0
  O  O22  1  0.281  0.484  0.273  1.0
  O  O23  1  0.516  0.719  0.227  1.0
  O  O24  1  0.719  0.516  0.727  1.0
  O  O25  1  0.484  0.281  0.773  1.0
  O  O26  1  0.975  0.331  0.128  1.0
  O  O27  1  0.669  0.025  0.372  1.0
  O  O28  1  0.025  0.669  0.872  1.0
  O  O29  1  0.331  0.975  0.628  1.0
  O  O30  1  0.463  0.279  0.335  1.0
  O  O31  1  0.721  0.537  0.165  1.0
  O  O32  1  0.537  0.721  0.665  1.0
  O  O33  1  0.279  0.463  0.835  1.0
  O  O34  1  0.978  0.601  0.314  1.0
  O  O35  1  0.399  0.022  0.186  1.0
  O  O36  1  0.022  0.399  0.686  1.0
  O  O37  1  0.601  0.978  0.814  1.0
  O  O38  1  0.141  0.151  0.407  1.0
  O  O39  1  0.849  0.859  0.093  1.0
  O  O40  1  0.859  0.849  0.593  1.0
  O  O41  1  0.151  0.141  0.907  1.0
[/CIF]
.