The crystal structure described by K2PbO2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), and two equivalent O(3) atoms. In the third K site, K(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form edge-sharing KO5 square pyramids. In the fourth K site, K(4) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted edge-sharing KO5 trigonal bipyramids. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one 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 K(2), one K(3), two equivalent K(4), and two equivalent Pb(1) atoms to form OK4Pb2 octahedra that share corners with three equivalent O(4)K3Pb2 trigonal bipyramids, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, and edges with four equivalent O(3)K5Pb octahedra. In the second O site, O(2) is bonded to one K(2), one K(3), one K(4), two equivalent K(1), and one Pb(2) atom to form OK5Pb octahedra that share corners with three equivalent O(3)K5Pb octahedra,  an edgeedge with one O(2)K5Pb octahedra,  an edgeedge with one O(3)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, and edges with three equivalent O(4)K3Pb2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 11-16°. In the third O site, O(3) is bonded to one K(4), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form OK5Pb octahedra that share corners with three equivalent O(2)K5Pb octahedra,  a cornercorner with one O(4)K3Pb2 trigonal bipyramid,  an edgeedge with one O(2)K5Pb octahedra, edges with two equivalent O(3)K5Pb octahedra, edges with four equivalent O(1)K4Pb2 octahedra, and  an edgeedge with one O(4)K3Pb2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 11-16°. In the fourth O site, O(4) is bonded to one K(1), one K(3), one K(4), and two equivalent Pb(2) atoms to form distorted OK3Pb2 trigonal bipyramids that share  a cornercorner with one O(3)K5Pb octahedra, corners with three equivalent O(1)K4Pb2 octahedra,  an edgeedge with one O(3)K5Pb octahedra, edges with three equivalent O(2)K5Pb octahedra, and  an edgeedge with one O(4)K3Pb2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 27-78°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2PbO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.327
_cell_length_b   7.511
_cell_length_c   9.976
_cell_angle_alpha   84.719
_cell_angle_beta   69.925
_cell_angle_gamma   61.170
_symmetry_Int_Tables_number   1
_cell_volume   449.953
_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
  K  K0  1  0.235  0.273  0.494  1.0
  K  K1  1  0.078  0.928  0.174  1.0
  K  K2  1  0.933  0.548  0.832  1.0
  K  K3  1  0.922  0.072  0.826  1.0
  K  K4  1  0.604  0.431  0.138  1.0
  K  K5  1  0.067  0.452  0.168  1.0
  K  K6  1  0.396  0.569  0.862  1.0
  K  K7  1  0.765  0.727  0.506  1.0
  Pb  Pb8  1  0.600  0.939  0.134  1.0
  Pb  Pb9  1  0.298  0.718  0.475  1.0
  Pb  Pb10  1  0.702  0.282  0.525  1.0
  Pb  Pb11  1  0.400  0.061  0.866  1.0
  O  O12  1  0.499  0.798  0.006  1.0
  O  O13  1  0.810  0.400  0.651  1.0
  O  O14  1  0.943  0.782  0.015  1.0
  O  O15  1  0.501  0.202  0.994  1.0
  O  O16  1  0.057  0.218  0.985  1.0
  O  O17  1  0.190  0.600  0.349  1.0
  O  O18  1  0.664  0.519  0.369  1.0
  O  O19  1  0.336  0.481  0.631  1.0
[/CIF]
.
The crystal structure described by K2PbO2 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(4) and two equivalent O(2) atoms. In the second K site, K(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(2), and two equivalent O(3) atoms. In the third K site, K(3) is bonded to one O(1), one O(2), one O(4), and two equivalent O(3) atoms to form edge-sharing KO5 square pyramids. In the fourth K site, K(4) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted edge-sharing KO5 trigonal bipyramids. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 3-coordinate geometry to one O(3) and two equivalent O(1) atoms. In the second Pb site, Pb(2) is bonded in a 3-coordinate geometry to one 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 K(2), one K(3), two equivalent K(4), and two equivalent Pb(1) atoms to form OK4Pb2 octahedra that share corners with three equivalent O(4)K3Pb2 trigonal bipyramids, edges with two equivalent O(1)K4Pb2 octahedra, edges with two equivalent O(2)K5Pb octahedra, and edges with four equivalent O(3)K5Pb octahedra. In the second O site, O(2) is bonded to one K(2), one K(3), one K(4), two equivalent K(1), and one Pb(2) atom to form OK5Pb octahedra that share corners with three equivalent O(3)K5Pb octahedra,  an edgeedge with one O(2)K5Pb octahedra,  an edgeedge with one O(3)K5Pb octahedra, edges with two equivalent O(1)K4Pb2 octahedra, and edges with three equivalent O(4)K3Pb2 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 11-16°. In the third O site, O(3) is bonded to one K(4), two equivalent K(2), two equivalent K(3), and one Pb(1) atom to form OK5Pb octahedra that share corners with three equivalent O(2)K5Pb octahedra,  a cornercorner with one O(4)K3Pb2 trigonal bipyramid,  an edgeedge with one O(2)K5Pb octahedra, edges with two equivalent O(3)K5Pb octahedra, edges with four equivalent O(1)K4Pb2 octahedra, and  an edgeedge with one O(4)K3Pb2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 11-16°. In the fourth O site, O(4) is bonded to one K(1), one K(3), one K(4), and two equivalent Pb(2) atoms to form distorted OK3Pb2 trigonal bipyramids that share  a cornercorner with one O(3)K5Pb octahedra, corners with three equivalent O(1)K4Pb2 octahedra,  an edgeedge with one O(3)K5Pb octahedra, edges with three equivalent O(2)K5Pb octahedra, and  an edgeedge with one O(4)K3Pb2 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 27-78°. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2PbO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.327
_cell_length_b   7.511
_cell_length_c   9.976
_cell_angle_alpha   84.719
_cell_angle_beta   69.925
_cell_angle_gamma   61.170
_symmetry_Int_Tables_number   1
_cell_volume   449.953
_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
  K  K0  1  0.235  0.273  0.494  1.0
  K  K1  1  0.078  0.928  0.174  1.0
  K  K2  1  0.933  0.548  0.832  1.0
  K  K3  1  0.922  0.072  0.826  1.0
  K  K4  1  0.604  0.431  0.138  1.0
  K  K5  1  0.067  0.452  0.168  1.0
  K  K6  1  0.396  0.569  0.862  1.0
  K  K7  1  0.765  0.727  0.506  1.0
  Pb  Pb8  1  0.600  0.939  0.134  1.0
  Pb  Pb9  1  0.298  0.718  0.475  1.0
  Pb  Pb10  1  0.702  0.282  0.525  1.0
  Pb  Pb11  1  0.400  0.061  0.866  1.0
  O  O12  1  0.499  0.798  0.006  1.0
  O  O13  1  0.810  0.400  0.651  1.0
  O  O14  1  0.943  0.782  0.015  1.0
  O  O15  1  0.501  0.202  0.994  1.0
  O  O16  1  0.057  0.218  0.985  1.0
  O  O17  1  0.190  0.600  0.349  1.0
  O  O18  1  0.664  0.519  0.369  1.0
  O  O19  1  0.336  0.481  0.631  1.0
[/CIF]
.