The structure described by ZnVSe2O7 crystallizes in the monoclinic P2_1/c space group. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form distorted VO6 octahedra that share corners with two equivalent V(1)O6 octahedra and corners with two equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 14°. Zn(1) is bonded to one O(1), one O(4), one O(7), and two equivalent O(5) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent V(1)O6 octahedra and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 47-53°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(7) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a trigonal planar geometry to one V(1), one Zn(1), and one Se(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one V(1), one Zn(1), and one Se(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one V(1) and one Se(2) atom. In the fourth O site, O(3) is bonded in a distorted linear geometry to two equivalent V(1) atoms. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Se(2) atom. In the seventh O site, O(6) is bonded in a bent 120 degrees geometry to one V(1) and one Se(2) atom. is represented by the CIF file [CIF]
data_VZnSe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.791
_cell_length_b   7.577
_cell_length_c   7.888
_cell_angle_alpha   58.980
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   655.147
_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
  V  V0  1  0.754  0.037  0.223  1.0
  V  V1  1  0.254  0.963  0.277  1.0
  V  V2  1  0.746  0.037  0.723  1.0
  V  V3  1  0.246  0.963  0.777  1.0
  Zn  Zn4  1  0.992  0.716  0.487  1.0
  Zn  Zn5  1  0.508  0.716  0.987  1.0
  Zn  Zn6  1  0.492  0.284  0.013  1.0
  Zn  Zn7  1  0.008  0.284  0.513  1.0
  Se  Se8  1  0.488  0.162  0.661  1.0
  Se  Se9  1  0.012  0.162  0.161  1.0
  Se  Se10  1  0.988  0.838  0.839  1.0
  Se  Se11  1  0.230  0.464  0.608  1.0
  Se  Se12  1  0.512  0.838  0.339  1.0
  Se  Se13  1  0.770  0.536  0.392  1.0
  Se  Se14  1  0.270  0.464  0.108  1.0
  Se  Se15  1  0.730  0.536  0.892  1.0
  O  O16  1  0.905  0.058  0.713  1.0
  O  O17  1  0.228  0.662  0.881  1.0
  O  O18  1  0.269  0.966  0.486  1.0
  O  O19  1  0.728  0.338  0.619  1.0
  O  O20  1  0.463  0.316  0.752  1.0
  O  O21  1  0.731  0.034  0.514  1.0
  O  O22  1  0.037  0.316  0.252  1.0
  O  O23  1  0.593  0.533  0.923  1.0
  O  O24  1  0.772  0.338  0.119  1.0
  O  O25  1  0.263  0.264  0.573  1.0
  O  O26  1  0.769  0.034  0.014  1.0
  O  O27  1  0.907  0.533  0.423  1.0
  O  O28  1  0.763  0.736  0.927  1.0
  O  O29  1  0.963  0.684  0.748  1.0
  O  O30  1  0.537  0.684  0.248  1.0
  O  O31  1  0.237  0.264  0.073  1.0
  O  O32  1  0.405  0.942  0.787  1.0
  O  O33  1  0.595  0.058  0.213  1.0
  O  O34  1  0.272  0.662  0.381  1.0
  O  O35  1  0.908  0.003  0.307  1.0
  O  O36  1  0.407  0.467  0.077  1.0
  O  O37  1  0.737  0.736  0.427  1.0
  O  O38  1  0.095  0.942  0.287  1.0
  O  O39  1  0.092  0.997  0.693  1.0
  O  O40  1  0.231  0.966  0.986  1.0
  O  O41  1  0.592  0.003  0.807  1.0
  O  O42  1  0.408  0.997  0.193  1.0
  O  O43  1  0.093  0.467  0.577  1.0
[/CIF]
.
The structure described by ZnVSe2O7 crystallizes in the monoclinic P2_1/c space group. V(1) is bonded to one O(1), one O(2), one O(6), one O(7), and two equivalent O(3) atoms to form distorted VO6 octahedra that share corners with two equivalent V(1)O6 octahedra and corners with two equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 14°. Zn(1) is bonded to one O(1), one O(4), one O(7), and two equivalent O(5) atoms to form distorted ZnO5 trigonal bipyramids that share corners with two equivalent V(1)O6 octahedra and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 47-53°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(7) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(5), and one O(6) atom. There are seven inequivalent O sites. In the first O site, O(7) is bonded in a trigonal planar geometry to one V(1), one Zn(1), and one Se(1) atom. In the second O site, O(1) is bonded in a trigonal planar geometry to one V(1), one Zn(1), and one Se(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one V(1) and one Se(2) atom. In the fourth O site, O(3) is bonded in a distorted linear geometry to two equivalent V(1) atoms. In the fifth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one Se(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one Se(2) atom. In the seventh O site, O(6) is bonded in a bent 120 degrees geometry to one V(1) and one Se(2) atom. is represented by the CIF file [CIF]
data_VZnSe2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   12.791
_cell_length_b   7.577
_cell_length_c   7.888
_cell_angle_alpha   58.980
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   655.147
_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
  V  V0  1  0.754  0.037  0.223  1.0
  V  V1  1  0.254  0.963  0.277  1.0
  V  V2  1  0.746  0.037  0.723  1.0
  V  V3  1  0.246  0.963  0.777  1.0
  Zn  Zn4  1  0.992  0.716  0.487  1.0
  Zn  Zn5  1  0.508  0.716  0.987  1.0
  Zn  Zn6  1  0.492  0.284  0.013  1.0
  Zn  Zn7  1  0.008  0.284  0.513  1.0
  Se  Se8  1  0.488  0.162  0.661  1.0
  Se  Se9  1  0.012  0.162  0.161  1.0
  Se  Se10  1  0.988  0.838  0.839  1.0
  Se  Se11  1  0.230  0.464  0.608  1.0
  Se  Se12  1  0.512  0.838  0.339  1.0
  Se  Se13  1  0.770  0.536  0.392  1.0
  Se  Se14  1  0.270  0.464  0.108  1.0
  Se  Se15  1  0.730  0.536  0.892  1.0
  O  O16  1  0.905  0.058  0.713  1.0
  O  O17  1  0.228  0.662  0.881  1.0
  O  O18  1  0.269  0.966  0.486  1.0
  O  O19  1  0.728  0.338  0.619  1.0
  O  O20  1  0.463  0.316  0.752  1.0
  O  O21  1  0.731  0.034  0.514  1.0
  O  O22  1  0.037  0.316  0.252  1.0
  O  O23  1  0.593  0.533  0.923  1.0
  O  O24  1  0.772  0.338  0.119  1.0
  O  O25  1  0.263  0.264  0.573  1.0
  O  O26  1  0.769  0.034  0.014  1.0
  O  O27  1  0.907  0.533  0.423  1.0
  O  O28  1  0.763  0.736  0.927  1.0
  O  O29  1  0.963  0.684  0.748  1.0
  O  O30  1  0.537  0.684  0.248  1.0
  O  O31  1  0.237  0.264  0.073  1.0
  O  O32  1  0.405  0.942  0.787  1.0
  O  O33  1  0.595  0.058  0.213  1.0
  O  O34  1  0.272  0.662  0.381  1.0
  O  O35  1  0.908  0.003  0.307  1.0
  O  O36  1  0.407  0.467  0.077  1.0
  O  O37  1  0.737  0.736  0.427  1.0
  O  O38  1  0.095  0.942  0.287  1.0
  O  O39  1  0.092  0.997  0.693  1.0
  O  O40  1  0.231  0.966  0.986  1.0
  O  O41  1  0.592  0.003  0.807  1.0
  O  O42  1  0.408  0.997  0.193  1.0
  O  O43  1  0.093  0.467  0.577  1.0
[/CIF]
.