The material structure described by KPb2Br5 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(5) atoms. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 7-coordinate geometry to one Br(2), two equivalent Br(1), two equivalent Br(3), and two equivalent Br(4) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one Br(1), one Br(2), one Br(3), two equivalent Br(4), and two equivalent Br(5) atoms. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Pb(2), and two equivalent Pb(1) atoms. In the second Br site, Br(2) is bonded to two equivalent K(1), one Pb(1), and one Pb(2) atom to form BrK2Pb2 trigonal pyramids that share corners with five equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(5)K2Pb2 trigonal pyramids, corners with two equivalent Br(4)Pb4 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(4)Pb4 trigonal pyramid, and edges with two equivalent Br(5)K2Pb2 trigonal pyramids. In the third Br site, Br(3) is bonded to two equivalent K(1), one Pb(2), and two equivalent Pb(1) atoms to form distorted BrK2Pb3 trigonal bipyramids that share corners with four equivalent Br(5)K2Pb2 trigonal pyramids, corners with four equivalent Br(4)Pb4 trigonal pyramids, corners with five equivalent Br(2)K2Pb2 trigonal pyramids, edges with two equivalent Br(3)K2Pb3 trigonal bipyramids,  an edgeedge with one Br(2)K2Pb2 trigonal pyramid,  an edgeedge with one Br(5)K2Pb2 trigonal pyramid, and  an edgeedge with one Br(4)Pb4 trigonal pyramid. In the fourth Br site, Br(4) is bonded to two equivalent Pb(1) and two equivalent Pb(2) atoms to form distorted BrPb4 trigonal pyramids that share corners with four equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(4)Pb4 trigonal pyramids, corners with four equivalent Br(5)K2Pb2 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(2)K2Pb2 trigonal pyramid, and  an edgeedge with one Br(4)Pb4 trigonal pyramid. In the fifth Br site, Br(5) is bonded to two equivalent K(1) and two equivalent Pb(2) atoms to form distorted BrK2Pb2 trigonal pyramids that share corners with four equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(5)K2Pb2 trigonal pyramids, corners with four equivalent Br(4)Pb4 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(5)K2Pb2 trigonal pyramid, and edges with two equivalent Br(2)K2Pb2 trigonal pyramids. is represented by the CIF file [CIF]
data_KPb2Br5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.453
_cell_length_b   9.297
_cell_length_c   13.157
_cell_angle_alpha   89.864
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1033.931
_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  0.550  0.491  0.328  1.0
  K  K1  1  0.050  0.509  0.172  1.0
  K  K2  1  0.450  0.509  0.672  1.0
  K  K3  1  0.950  0.491  0.828  1.0
  Pb  Pb4  1  0.498  0.986  0.324  1.0
  Pb  Pb5  1  0.569  0.744  0.006  1.0
  Pb  Pb6  1  0.069  0.256  0.494  1.0
  Pb  Pb7  1  0.431  0.256  0.994  1.0
  Pb  Pb8  1  0.931  0.744  0.506  1.0
  Pb  Pb9  1  0.002  0.986  0.824  1.0
  Pb  Pb10  1  0.502  0.014  0.676  1.0
  Pb  Pb11  1  0.998  0.014  0.176  1.0
  Br  Br12  1  0.312  0.236  0.219  1.0
  Br  Br13  1  0.651  0.236  0.812  1.0
  Br  Br14  1  0.151  0.764  0.688  1.0
  Br  Br15  1  0.349  0.764  0.188  1.0
  Br  Br16  1  0.849  0.236  0.312  1.0
  Br  Br17  1  0.688  0.764  0.781  1.0
  Br  Br18  1  0.188  0.236  0.719  1.0
  Br  Br19  1  0.540  0.779  0.503  1.0
  Br  Br20  1  0.663  0.042  0.100  1.0
  Br  Br21  1  0.163  0.958  0.400  1.0
  Br  Br22  1  0.337  0.958  0.900  1.0
  Br  Br23  1  0.837  0.042  0.600  1.0
  Br  Br24  1  0.460  0.221  0.497  1.0
  Br  Br25  1  0.040  0.221  0.997  1.0
  Br  Br26  1  0.820  0.458  0.580  1.0
  Br  Br27  1  0.960  0.779  0.003  1.0
  Br  Br28  1  0.680  0.458  0.080  1.0
  Br  Br29  1  0.180  0.542  0.420  1.0
  Br  Br30  1  0.320  0.542  0.920  1.0
  Br  Br31  1  0.812  0.764  0.281  1.0
[/CIF]
.
The material structure described by KPb2Br5 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 8-coordinate geometry to two equivalent Br(1), two equivalent Br(2), two equivalent Br(3), and two equivalent Br(5) atoms. There are two inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 7-coordinate geometry to one Br(2), two equivalent Br(1), two equivalent Br(3), and two equivalent Br(4) atoms. In the second Pb site, Pb(2) is bonded in a 7-coordinate geometry to one Br(1), one Br(2), one Br(3), two equivalent Br(4), and two equivalent Br(5) atoms. There are five inequivalent Br sites. In the first Br site, Br(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Pb(2), and two equivalent Pb(1) atoms. In the second Br site, Br(2) is bonded to two equivalent K(1), one Pb(1), and one Pb(2) atom to form BrK2Pb2 trigonal pyramids that share corners with five equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(5)K2Pb2 trigonal pyramids, corners with two equivalent Br(4)Pb4 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(4)Pb4 trigonal pyramid, and edges with two equivalent Br(5)K2Pb2 trigonal pyramids. In the third Br site, Br(3) is bonded to two equivalent K(1), one Pb(2), and two equivalent Pb(1) atoms to form distorted BrK2Pb3 trigonal bipyramids that share corners with four equivalent Br(5)K2Pb2 trigonal pyramids, corners with four equivalent Br(4)Pb4 trigonal pyramids, corners with five equivalent Br(2)K2Pb2 trigonal pyramids, edges with two equivalent Br(3)K2Pb3 trigonal bipyramids,  an edgeedge with one Br(2)K2Pb2 trigonal pyramid,  an edgeedge with one Br(5)K2Pb2 trigonal pyramid, and  an edgeedge with one Br(4)Pb4 trigonal pyramid. In the fourth Br site, Br(4) is bonded to two equivalent Pb(1) and two equivalent Pb(2) atoms to form distorted BrPb4 trigonal pyramids that share corners with four equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(4)Pb4 trigonal pyramids, corners with four equivalent Br(5)K2Pb2 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(2)K2Pb2 trigonal pyramid, and  an edgeedge with one Br(4)Pb4 trigonal pyramid. In the fifth Br site, Br(5) is bonded to two equivalent K(1) and two equivalent Pb(2) atoms to form distorted BrK2Pb2 trigonal pyramids that share corners with four equivalent Br(3)K2Pb3 trigonal bipyramids, corners with two equivalent Br(2)K2Pb2 trigonal pyramids, corners with two equivalent Br(5)K2Pb2 trigonal pyramids, corners with four equivalent Br(4)Pb4 trigonal pyramids,  an edgeedge with one Br(3)K2Pb3 trigonal bipyramid,  an edgeedge with one Br(5)K2Pb2 trigonal pyramid, and edges with two equivalent Br(2)K2Pb2 trigonal pyramids. is represented by the CIF file [CIF]
data_KPb2Br5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.453
_cell_length_b   9.297
_cell_length_c   13.157
_cell_angle_alpha   89.864
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1033.931
_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  0.550  0.491  0.328  1.0
  K  K1  1  0.050  0.509  0.172  1.0
  K  K2  1  0.450  0.509  0.672  1.0
  K  K3  1  0.950  0.491  0.828  1.0
  Pb  Pb4  1  0.498  0.986  0.324  1.0
  Pb  Pb5  1  0.569  0.744  0.006  1.0
  Pb  Pb6  1  0.069  0.256  0.494  1.0
  Pb  Pb7  1  0.431  0.256  0.994  1.0
  Pb  Pb8  1  0.931  0.744  0.506  1.0
  Pb  Pb9  1  0.002  0.986  0.824  1.0
  Pb  Pb10  1  0.502  0.014  0.676  1.0
  Pb  Pb11  1  0.998  0.014  0.176  1.0
  Br  Br12  1  0.312  0.236  0.219  1.0
  Br  Br13  1  0.651  0.236  0.812  1.0
  Br  Br14  1  0.151  0.764  0.688  1.0
  Br  Br15  1  0.349  0.764  0.188  1.0
  Br  Br16  1  0.849  0.236  0.312  1.0
  Br  Br17  1  0.688  0.764  0.781  1.0
  Br  Br18  1  0.188  0.236  0.719  1.0
  Br  Br19  1  0.540  0.779  0.503  1.0
  Br  Br20  1  0.663  0.042  0.100  1.0
  Br  Br21  1  0.163  0.958  0.400  1.0
  Br  Br22  1  0.337  0.958  0.900  1.0
  Br  Br23  1  0.837  0.042  0.600  1.0
  Br  Br24  1  0.460  0.221  0.497  1.0
  Br  Br25  1  0.040  0.221  0.997  1.0
  Br  Br26  1  0.820  0.458  0.580  1.0
  Br  Br27  1  0.960  0.779  0.003  1.0
  Br  Br28  1  0.680  0.458  0.080  1.0
  Br  Br29  1  0.180  0.542  0.420  1.0
  Br  Br30  1  0.320  0.542  0.920  1.0
  Br  Br31  1  0.812  0.764  0.281  1.0
[/CIF]
.