The compound described by K2(TcSe2)3 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent Se(3), two equivalent Se(4), and two equivalent Se(6) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(4), two equivalent Se(5), and two equivalent Se(6) atoms. In the third K site, K(3) is bonded in a 7-coordinate geometry to one Se(3), one Se(4), one Se(6), two equivalent Se(2), and two equivalent Se(5) atoms. There are three inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(5) atom to form distorted edge-sharing TcSe5 square pyramids. In the second Tc site, Tc(2) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(6) atom to form a mixture of edge and corner-sharing TcSe5 square pyramids. In the third Tc site, Tc(3) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(6) atom to form a mixture of distorted edge and corner-sharing TcSe5 square pyramids. There are six inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to one K(2), one Tc(1), one Tc(2), and one Tc(3) atom. In the second Se site, Se(2) is bonded to two equivalent K(3), one Tc(1), one Tc(2), and one Tc(3) atom to form distorted SeK2Tc3 trigonal bipyramids that share corners with two equivalent Se(6)K3Tc2 trigonal bipyramids,  an edgeedge with one Se(2)K2Tc3 trigonal bipyramid, and  an edgeedge with one Se(6)K3Tc2 trigonal bipyramid. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one K(1), one K(3), one Tc(1), one Tc(2), and one Tc(3) atom. In the fourth Se site, Se(4) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one Tc(1), one Tc(2), and one Tc(3) atom. In the fifth Se site, Se(5) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(3), one Tc(1), and one Se(5) atom. In the sixth Se site, Se(6) is bonded to one K(1), one K(2), one K(3), one Tc(2), and one Tc(3) atom to form distorted SeK3Tc2 trigonal bipyramids that share corners with two equivalent Se(2)K2Tc3 trigonal bipyramids,  an edgeedge with one Se(2)K2Tc3 trigonal bipyramid, and  an edgeedge with one Se(6)K3Tc2 trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2(TcSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.010
_cell_length_b   10.010
_cell_length_c   12.407
_cell_angle_alpha   88.631
_cell_angle_beta   88.631
_cell_angle_gamma   60.751
_symmetry_Int_Tables_number   1
_cell_volume   1084.163
_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  0.602  0.398  0.750  1.0
  K  K1  1  0.398  0.602  0.250  1.0
  K  K2  1  0.217  0.783  0.750  1.0
  K  K3  1  0.783  0.217  0.250  1.0
  K  K4  1  0.123  0.647  0.019  1.0
  K  K5  1  0.353  0.877  0.481  1.0
  K  K6  1  0.877  0.353  0.981  1.0
  K  K7  1  0.647  0.123  0.519  1.0
  Tc  Tc8  1  0.004  0.316  0.526  1.0
  Tc  Tc9  1  0.684  0.996  0.974  1.0
  Tc  Tc10  1  0.996  0.684  0.474  1.0
  Tc  Tc11  1  0.316  0.004  0.026  1.0
  Tc  Tc12  1  0.111  0.471  0.625  1.0
  Tc  Tc13  1  0.529  0.889  0.875  1.0
  Tc  Tc14  1  0.889  0.529  0.375  1.0
  Tc  Tc15  1  0.471  0.111  0.125  1.0
  Tc  Tc16  1  0.819  0.600  0.580  1.0
  Tc  Tc17  1  0.400  0.181  0.920  1.0
  Tc  Tc18  1  0.181  0.400  0.420  1.0
  Tc  Tc19  1  0.600  0.819  0.080  1.0
  Se  Se20  1  0.073  0.253  0.333  1.0
  Se  Se21  1  0.747  0.927  0.167  1.0
  Se  Se22  1  0.927  0.747  0.667  1.0
  Se  Se23  1  0.253  0.073  0.833  1.0
  Se  Se24  1  0.798  0.716  0.930  1.0
  Se  Se25  1  0.284  0.202  0.570  1.0
  Se  Se26  1  0.202  0.284  0.070  1.0
  Se  Se27  1  0.716  0.798  0.430  1.0
  Se  Se28  1  0.061  0.609  0.280  1.0
  Se  Se29  1  0.391  0.939  0.220  1.0
  Se  Se30  1  0.939  0.391  0.720  1.0
  Se  Se31  1  0.609  0.061  0.780  1.0
  Se  Se32  1  0.279  0.553  0.519  1.0
  Se  Se33  1  0.447  0.721  0.981  1.0
  Se  Se34  1  0.721  0.447  0.481  1.0
  Se  Se35  1  0.553  0.279  0.019  1.0
  Se  Se36  1  0.065  0.998  0.081  1.0
  Se  Se37  1  0.002  0.935  0.419  1.0
  Se  Se38  1  0.935  0.002  0.919  1.0
  Se  Se39  1  0.998  0.065  0.581  1.0
  Se  Se40  1  0.263  0.440  0.805  1.0
  Se  Se41  1  0.560  0.737  0.695  1.0
  Se  Se42  1  0.737  0.560  0.195  1.0
  Se  Se43  1  0.440  0.263  0.305  1.0
[/CIF]
.
The compound described by K2(TcSe2)3 crystallizes in the monoclinic C2/c space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to two equivalent Se(3), two equivalent Se(4), and two equivalent Se(6) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(4), two equivalent Se(5), and two equivalent Se(6) atoms. In the third K site, K(3) is bonded in a 7-coordinate geometry to one Se(3), one Se(4), one Se(6), two equivalent Se(2), and two equivalent Se(5) atoms. There are three inequivalent Tc sites. In the first Tc site, Tc(1) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(5) atom to form distorted edge-sharing TcSe5 square pyramids. In the second Tc site, Tc(2) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(6) atom to form a mixture of edge and corner-sharing TcSe5 square pyramids. In the third Tc site, Tc(3) is bonded to one Se(1), one Se(2), one Se(3), one Se(4), and one Se(6) atom to form a mixture of distorted edge and corner-sharing TcSe5 square pyramids. There are six inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to one K(2), one Tc(1), one Tc(2), and one Tc(3) atom. In the second Se site, Se(2) is bonded to two equivalent K(3), one Tc(1), one Tc(2), and one Tc(3) atom to form distorted SeK2Tc3 trigonal bipyramids that share corners with two equivalent Se(6)K3Tc2 trigonal bipyramids,  an edgeedge with one Se(2)K2Tc3 trigonal bipyramid, and  an edgeedge with one Se(6)K3Tc2 trigonal bipyramid. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to one K(1), one K(3), one Tc(1), one Tc(2), and one Tc(3) atom. In the fourth Se site, Se(4) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one Tc(1), one Tc(2), and one Tc(3) atom. In the fifth Se site, Se(5) is bonded in a 5-coordinate geometry to one K(2), two equivalent K(3), one Tc(1), and one Se(5) atom. In the sixth Se site, Se(6) is bonded to one K(1), one K(2), one K(3), one Tc(2), and one Tc(3) atom to form distorted SeK3Tc2 trigonal bipyramids that share corners with two equivalent Se(2)K2Tc3 trigonal bipyramids,  an edgeedge with one Se(2)K2Tc3 trigonal bipyramid, and  an edgeedge with one Se(6)K3Tc2 trigonal bipyramid. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2(TcSe2)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.010
_cell_length_b   10.010
_cell_length_c   12.407
_cell_angle_alpha   88.631
_cell_angle_beta   88.631
_cell_angle_gamma   60.751
_symmetry_Int_Tables_number   1
_cell_volume   1084.163
_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  0.602  0.398  0.750  1.0
  K  K1  1  0.398  0.602  0.250  1.0
  K  K2  1  0.217  0.783  0.750  1.0
  K  K3  1  0.783  0.217  0.250  1.0
  K  K4  1  0.123  0.647  0.019  1.0
  K  K5  1  0.353  0.877  0.481  1.0
  K  K6  1  0.877  0.353  0.981  1.0
  K  K7  1  0.647  0.123  0.519  1.0
  Tc  Tc8  1  0.004  0.316  0.526  1.0
  Tc  Tc9  1  0.684  0.996  0.974  1.0
  Tc  Tc10  1  0.996  0.684  0.474  1.0
  Tc  Tc11  1  0.316  0.004  0.026  1.0
  Tc  Tc12  1  0.111  0.471  0.625  1.0
  Tc  Tc13  1  0.529  0.889  0.875  1.0
  Tc  Tc14  1  0.889  0.529  0.375  1.0
  Tc  Tc15  1  0.471  0.111  0.125  1.0
  Tc  Tc16  1  0.819  0.600  0.580  1.0
  Tc  Tc17  1  0.400  0.181  0.920  1.0
  Tc  Tc18  1  0.181  0.400  0.420  1.0
  Tc  Tc19  1  0.600  0.819  0.080  1.0
  Se  Se20  1  0.073  0.253  0.333  1.0
  Se  Se21  1  0.747  0.927  0.167  1.0
  Se  Se22  1  0.927  0.747  0.667  1.0
  Se  Se23  1  0.253  0.073  0.833  1.0
  Se  Se24  1  0.798  0.716  0.930  1.0
  Se  Se25  1  0.284  0.202  0.570  1.0
  Se  Se26  1  0.202  0.284  0.070  1.0
  Se  Se27  1  0.716  0.798  0.430  1.0
  Se  Se28  1  0.061  0.609  0.280  1.0
  Se  Se29  1  0.391  0.939  0.220  1.0
  Se  Se30  1  0.939  0.391  0.720  1.0
  Se  Se31  1  0.609  0.061  0.780  1.0
  Se  Se32  1  0.279  0.553  0.519  1.0
  Se  Se33  1  0.447  0.721  0.981  1.0
  Se  Se34  1  0.721  0.447  0.481  1.0
  Se  Se35  1  0.553  0.279  0.019  1.0
  Se  Se36  1  0.065  0.998  0.081  1.0
  Se  Se37  1  0.002  0.935  0.419  1.0
  Se  Se38  1  0.935  0.002  0.919  1.0
  Se  Se39  1  0.998  0.065  0.581  1.0
  Se  Se40  1  0.263  0.440  0.805  1.0
  Se  Se41  1  0.560  0.737  0.695  1.0
  Se  Se42  1  0.737  0.560  0.195  1.0
  Se  Se43  1  0.440  0.263  0.305  1.0
[/CIF]
.