The material structure described by Cr4O15 is Indium-like structured and crystallizes in the monoclinic Pc space group. The structure is zero-dimensional and consists of two Cr4O15 clusters. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(10), one O(3), one O(5), and one O(9) atom to form corner-sharing CrO4 tetrahedra. In the third Cr site, Cr(3) is bonded to one O(12), one O(2), one O(4), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one O(11), one O(13), one O(4), and one O(8) atom to form corner-sharing CrO4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cr(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cr(3) and one Cr(4) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cr(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Cr(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Cr(4) and one O(14) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one O(15) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Cr(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Cr(4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Cr(3) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Cr(4) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one O(8) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one O(9) atom. is represented by the CIF file [CIF]
data_Cr4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.942
_cell_length_b   9.020
_cell_length_c   9.318
_cell_angle_alpha   86.782
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   666.394
_cell_formula_units_Z   2
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
  Cr  Cr0  1  0.112  0.564  0.441  1.0
  Cr  Cr1  1  0.888  0.564  0.941  1.0
  Cr  Cr2  1  0.920  0.880  0.307  1.0
  Cr  Cr3  1  0.080  0.880  0.807  1.0
  Cr  Cr4  1  0.441  0.557  0.670  1.0
  Cr  Cr5  1  0.559  0.557  0.170  1.0
  Cr  Cr6  1  0.419  0.213  0.721  1.0
  Cr  Cr7  1  0.581  0.213  0.221  1.0
  O  O8  1  0.981  0.541  0.569  1.0
  O  O9  1  0.019  0.541  0.069  1.0
  O  O10  1  0.317  0.570  0.804  1.0
  O  O11  1  0.683  0.570  0.304  1.0
  O  O12  1  0.061  0.729  0.338  1.0
  O  O13  1  0.939  0.729  0.838  1.0
  O  O14  1  0.538  0.380  0.685  1.0
  O  O15  1  0.462  0.380  0.185  1.0
  O  O16  1  0.797  0.904  0.439  1.0
  O  O17  1  0.203  0.904  0.939  1.0
  O  O18  1  0.102  0.423  0.345  1.0
  O  O19  1  0.898  0.423  0.845  1.0
  O  O20  1  0.322  0.576  0.509  1.0
  O  O21  1  0.678  0.576  0.009  1.0
  O  O22  1  0.559  0.040  0.731  1.0
  O  O23  1  0.441  0.040  0.231  1.0
  O  O24  1  0.050  0.060  0.286  1.0
  O  O25  1  0.950  0.060  0.786  1.0
  O  O26  1  0.818  0.870  0.159  1.0
  O  O27  1  0.182  0.870  0.659  1.0
  O  O28  1  0.330  0.218  0.874  1.0
  O  O29  1  0.670  0.218  0.374  1.0
  O  O30  1  0.583  0.681  0.674  1.0
  O  O31  1  0.417  0.681  0.174  1.0
  O  O32  1  0.285  0.195  0.595  1.0
  O  O33  1  0.715  0.195  0.095  1.0
  O  O34  1  0.420  0.956  0.344  1.0
  O  O35  1  0.580  0.956  0.844  1.0
  O  O36  1  0.925  0.131  0.666  1.0
  O  O37  1  0.075  0.131  0.166  1.0
[/CIF]
.
The material structure described by Cr4O15 is Indium-like structured and crystallizes in the monoclinic Pc space group. The structure is zero-dimensional and consists of two Cr4O15 clusters. There are four inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the second Cr site, Cr(2) is bonded to one O(10), one O(3), one O(5), and one O(9) atom to form corner-sharing CrO4 tetrahedra. In the third Cr site, Cr(3) is bonded to one O(12), one O(2), one O(4), and one O(7) atom to form corner-sharing CrO4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one O(11), one O(13), one O(4), and one O(8) atom to form corner-sharing CrO4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Cr(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Cr(3) and one Cr(4) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cr(2) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one Cr(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Cr(1) and one Cr(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Cr(4) and one O(14) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Cr(2) and one O(15) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Cr(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Cr(4) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Cr(3) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Cr(4) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one O(8) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one O(9) atom. is represented by the CIF file [CIF]
data_Cr4O15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.942
_cell_length_b   9.020
_cell_length_c   9.318
_cell_angle_alpha   86.782
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   666.394
_cell_formula_units_Z   2
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
  Cr  Cr0  1  0.112  0.564  0.441  1.0
  Cr  Cr1  1  0.888  0.564  0.941  1.0
  Cr  Cr2  1  0.920  0.880  0.307  1.0
  Cr  Cr3  1  0.080  0.880  0.807  1.0
  Cr  Cr4  1  0.441  0.557  0.670  1.0
  Cr  Cr5  1  0.559  0.557  0.170  1.0
  Cr  Cr6  1  0.419  0.213  0.721  1.0
  Cr  Cr7  1  0.581  0.213  0.221  1.0
  O  O8  1  0.981  0.541  0.569  1.0
  O  O9  1  0.019  0.541  0.069  1.0
  O  O10  1  0.317  0.570  0.804  1.0
  O  O11  1  0.683  0.570  0.304  1.0
  O  O12  1  0.061  0.729  0.338  1.0
  O  O13  1  0.939  0.729  0.838  1.0
  O  O14  1  0.538  0.380  0.685  1.0
  O  O15  1  0.462  0.380  0.185  1.0
  O  O16  1  0.797  0.904  0.439  1.0
  O  O17  1  0.203  0.904  0.939  1.0
  O  O18  1  0.102  0.423  0.345  1.0
  O  O19  1  0.898  0.423  0.845  1.0
  O  O20  1  0.322  0.576  0.509  1.0
  O  O21  1  0.678  0.576  0.009  1.0
  O  O22  1  0.559  0.040  0.731  1.0
  O  O23  1  0.441  0.040  0.231  1.0
  O  O24  1  0.050  0.060  0.286  1.0
  O  O25  1  0.950  0.060  0.786  1.0
  O  O26  1  0.818  0.870  0.159  1.0
  O  O27  1  0.182  0.870  0.659  1.0
  O  O28  1  0.330  0.218  0.874  1.0
  O  O29  1  0.670  0.218  0.374  1.0
  O  O30  1  0.583  0.681  0.674  1.0
  O  O31  1  0.417  0.681  0.174  1.0
  O  O32  1  0.285  0.195  0.595  1.0
  O  O33  1  0.715  0.195  0.095  1.0
  O  O34  1  0.420  0.956  0.344  1.0
  O  O35  1  0.580  0.956  0.844  1.0
  O  O36  1  0.925  0.131  0.666  1.0
  O  O37  1  0.075  0.131  0.166  1.0
[/CIF]
.