The compound described by (Fe2As2H2O9)4O2 crystallizes in the triclinic P1 space group. The structure consists of one water atom inside a Fe2As2H2O9 framework. In the Fe2As2H2O9 framework, there are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(13), one O(16), one O(17), one O(2), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and  an edgeedge with one Fe(3)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(14), one O(15), one O(18), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and  an edgeedge with one Fe(4)O6 octahedra. In the third Fe site, Fe(3) is bonded to one O(11), one O(16), one O(2), one O(3), one O(4), and one O(5) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(12), one O(15), one O(3), one O(4), and one O(6) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(13), one O(15), one O(5), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-59°. In the second As site, As(2) is bonded to one O(10), one O(14), one O(16), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-59°. In the third As site, As(3) is bonded to one O(1), one O(11), one O(17), and one O(3) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, and corners with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-58°. In the fourth As site, As(4) is bonded to one O(12), one O(18), one O(2), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, and corners with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-58°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one As(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(4), and one As(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(4), and one As(4) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(3) and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(4) and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Fe(1), one H(1), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Fe(2), one H(2), and one H(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one As(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one As(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(3) and one As(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(4) and one As(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Fe(1) and one As(1) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Fe(2) and one As(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one As(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one As(2) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Fe(1) and one As(3) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Fe(2) and one As(4) atom. is represented by the CIF card [CIF]
data_Fe4As4H4O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.689
_cell_length_b   6.685
_cell_length_c   9.205
_cell_angle_alpha   94.991
_cell_angle_beta   104.445
_cell_angle_gamma   75.245
_symmetry_Int_Tables_number   1
_cell_volume   385.349
_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
  Fe  Fe0  1  0.646  0.130  0.310  1.0
  Fe  Fe1  1  0.355  0.871  0.692  1.0
  Fe  Fe2  1  0.826  0.211  0.021  1.0
  Fe  Fe3  1  0.173  0.790  0.978  1.0
  As  As4  1  0.804  0.009  0.683  1.0
  As  As5  1  0.196  0.991  0.317  1.0
  As  As6  1  0.708  0.753  0.057  1.0
  As  As7  1  0.292  0.248  0.943  1.0
  H  H8  1  0.724  0.502  0.379  1.0
  H  H9  1  0.289  0.500  0.595  1.0
  H  H10  1  0.477  0.558  0.292  1.0
  H  H11  1  0.522  0.439  0.710  1.0
  O  O12  1  0.457  0.795  0.933  1.0
  O  O13  1  0.542  0.206  0.068  1.0
  O  O14  1  0.859  0.883  0.987  1.0
  O  O15  1  0.141  0.119  0.013  1.0
  O  O16  1  0.742  0.224  0.800  1.0
  O  O17  1  0.257  0.777  0.200  1.0
  O  O18  1  0.595  0.448  0.345  1.0
  O  O19  1  0.406  0.554  0.661  1.0
  O  O20  1  0.638  0.847  0.663  1.0
  O  O21  1  0.360  0.155  0.339  1.0
  O  O22  1  0.820  0.497  0.060  1.0
  O  O23  1  0.180  0.504  0.941  1.0
  O  O24  1  0.797  0.101  0.516  1.0
  O  O25  1  0.203  0.895  0.484  1.0
  O  O26  1  0.065  0.865  0.754  1.0
  O  O27  1  0.935  0.137  0.247  1.0
  O  O28  1  0.693  0.837  0.235  1.0
  O  O29  1  0.307  0.164  0.765  1.0
  O  O30  1  0.008  0.516  0.467  1.0
[/CIF]
.
The compound described by (Fe2As2H2O9)4O2 crystallizes in the triclinic P1 space group. The structure consists of one water atom inside a Fe2As2H2O9 framework. In the Fe2As2H2O9 framework, there are four inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(10), one O(13), one O(16), one O(17), one O(2), and one O(7) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(2)O4 tetrahedra, and  an edgeedge with one Fe(3)O6 octahedra. In the second Fe site, Fe(2) is bonded to one O(1), one O(14), one O(15), one O(18), one O(8), and one O(9) atom to form FeO6 octahedra that share  a cornercorner with one As(2)O4 tetrahedra,  a cornercorner with one As(3)O4 tetrahedra,  a cornercorner with one As(4)O4 tetrahedra, corners with two equivalent As(1)O4 tetrahedra, and  an edgeedge with one Fe(4)O6 octahedra. In the third Fe site, Fe(3) is bonded to one O(11), one O(16), one O(2), one O(3), one O(4), and one O(5) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra,  an edgeedge with one Fe(1)O6 octahedra, and  an edgeedge with one Fe(4)O6 octahedra. In the fourth Fe site, Fe(4) is bonded to one O(1), one O(12), one O(15), one O(3), one O(4), and one O(6) atom to form FeO6 octahedra that share  a cornercorner with one As(1)O4 tetrahedra,  a cornercorner with one As(2)O4 tetrahedra, corners with two equivalent As(3)O4 tetrahedra, corners with two equivalent As(4)O4 tetrahedra,  an edgeedge with one Fe(2)O6 octahedra, and  an edgeedge with one Fe(3)O6 octahedra. There are four inequivalent As sites. In the first As site, As(1) is bonded to one O(13), one O(15), one O(5), and one O(9) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 35-59°. In the second As site, As(2) is bonded to one O(10), one O(14), one O(16), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(2)O6 octahedra,  a cornercorner with one Fe(3)O6 octahedra,  a cornercorner with one Fe(4)O6 octahedra, and corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 36-59°. In the third As site, As(3) is bonded to one O(1), one O(11), one O(17), and one O(3) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, and corners with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-58°. In the fourth As site, As(4) is bonded to one O(12), one O(18), one O(2), and one O(4) atom to form AsO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra,  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent Fe(3)O6 octahedra, and corners with two equivalent Fe(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 24-58°. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one As(3) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one As(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(4), and one As(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(3), one Fe(4), and one As(4) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(3) and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(4) and one As(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Fe(1), one H(1), and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Fe(2), one H(2), and one H(4) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Fe(2) and one As(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Fe(1) and one As(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Fe(3) and one As(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Fe(4) and one As(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Fe(1) and one As(1) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Fe(2) and one As(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(4), and one As(1) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one As(2) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Fe(1) and one As(3) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Fe(2) and one As(4) atom. is represented by the CIF card [CIF]
data_Fe4As4H4O19
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.689
_cell_length_b   6.685
_cell_length_c   9.205
_cell_angle_alpha   94.991
_cell_angle_beta   104.445
_cell_angle_gamma   75.245
_symmetry_Int_Tables_number   1
_cell_volume   385.349
_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
  Fe  Fe0  1  0.646  0.130  0.310  1.0
  Fe  Fe1  1  0.355  0.871  0.692  1.0
  Fe  Fe2  1  0.826  0.211  0.021  1.0
  Fe  Fe3  1  0.173  0.790  0.978  1.0
  As  As4  1  0.804  0.009  0.683  1.0
  As  As5  1  0.196  0.991  0.317  1.0
  As  As6  1  0.708  0.753  0.057  1.0
  As  As7  1  0.292  0.248  0.943  1.0
  H  H8  1  0.724  0.502  0.379  1.0
  H  H9  1  0.289  0.500  0.595  1.0
  H  H10  1  0.477  0.558  0.292  1.0
  H  H11  1  0.522  0.439  0.710  1.0
  O  O12  1  0.457  0.795  0.933  1.0
  O  O13  1  0.542  0.206  0.068  1.0
  O  O14  1  0.859  0.883  0.987  1.0
  O  O15  1  0.141  0.119  0.013  1.0
  O  O16  1  0.742  0.224  0.800  1.0
  O  O17  1  0.257  0.777  0.200  1.0
  O  O18  1  0.595  0.448  0.345  1.0
  O  O19  1  0.406  0.554  0.661  1.0
  O  O20  1  0.638  0.847  0.663  1.0
  O  O21  1  0.360  0.155  0.339  1.0
  O  O22  1  0.820  0.497  0.060  1.0
  O  O23  1  0.180  0.504  0.941  1.0
  O  O24  1  0.797  0.101  0.516  1.0
  O  O25  1  0.203  0.895  0.484  1.0
  O  O26  1  0.065  0.865  0.754  1.0
  O  O27  1  0.935  0.137  0.247  1.0
  O  O28  1  0.693  0.837  0.235  1.0
  O  O29  1  0.307  0.164  0.765  1.0
  O  O30  1  0.008  0.516  0.467  1.0
[/CIF]
.