Rb7(FeTe2)4 crystallizes in the monoclinic C2/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 12-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one Te(1), one Te(3), two equivalent Te(2), and two equivalent Te(4) atoms. In the third Rb site, Rb(3) is bonded in a 9-coordinate geometry to one Fe(1), one Fe(2), one Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one Te(1), two equivalent Te(3), and two equivalent Te(4) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Te(1), one Te(4), and two equivalent Te(2) atoms. In the second Fe site, Fe(1) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Te(2), one Te(3), and two equivalent Te(1) atoms. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Fe(2), and two equivalent Fe(1) atoms. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), one Fe(1), and two equivalent Fe(2) atoms. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Fe(1) atom. In the fourth Te site, Te(4) is bonded in a distorted body-centered cubic geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Fe(2) atom.
Rb7(FeTe2)4 crystallizes in the monoclinic C2/c space group. There are four inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 12-coordinate geometry to two equivalent Fe(1), two equivalent Fe(2), two equivalent Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. Both Rb(1)-Fe(1) bond lengths are 3.82 Å. Both Rb(1)-Fe(2) bond lengths are 3.81 Å. Both Rb(1)-Te(1) bond lengths are 3.70 Å. Both Rb(1)-Te(2) bond lengths are 3.69 Å. Both Rb(1)-Te(3) bond lengths are 3.94 Å. Both Rb(1)-Te(4) bond lengths are 3.98 Å. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one Te(1), one Te(3), two equivalent Te(2), and two equivalent Te(4) atoms. The Rb(2)-Te(1) bond length is 3.77 Å. The Rb(2)-Te(3) bond length is 3.69 Å. There is one shorter (3.77 Å) and one longer (4.29 Å) Rb(2)-Te(2) bond length. There is one shorter (3.73 Å) and one longer (3.98 Å) Rb(2)-Te(4) bond length. In the third Rb site, Rb(3) is bonded in a 9-coordinate geometry to one Fe(1), one Fe(2), one Te(1), two equivalent Te(2), two equivalent Te(3), and two equivalent Te(4) atoms. The Rb(3)-Fe(1) bond length is 3.92 Å. The Rb(3)-Fe(2) bond length is 3.88 Å. The Rb(3)-Te(1) bond length is 3.79 Å. There is one shorter (3.72 Å) and one longer (4.16 Å) Rb(3)-Te(2) bond length. There is one shorter (3.65 Å) and one longer (4.08 Å) Rb(3)-Te(3) bond length. There is one shorter (3.70 Å) and one longer (4.00 Å) Rb(3)-Te(4) bond length. In the fourth Rb site, Rb(4) is bonded in a 5-coordinate geometry to one Te(1), two equivalent Te(3), and two equivalent Te(4) atoms. The Rb(4)-Te(1) bond length is 4.17 Å. There is one shorter (3.71 Å) and one longer (3.72 Å) Rb(4)-Te(3) bond length. There is one shorter (3.70 Å) and one longer (3.74 Å) Rb(4)-Te(4) bond length. There are two inequivalent Fe sites. In the first Fe site, Fe(2) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Te(1), one Te(4), and two equivalent Te(2) atoms. The Fe(2)-Te(1) bond length is 2.62 Å. The Fe(2)-Te(4) bond length is 2.59 Å. Both Fe(2)-Te(2) bond lengths are 2.63 Å. In the second Fe site, Fe(1) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(3), one Te(2), one Te(3), and two equivalent Te(1) atoms. The Fe(1)-Te(2) bond length is 2.62 Å. The Fe(1)-Te(3) bond length is 2.59 Å. Both Fe(1)-Te(1) bond lengths are 2.63 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded in a 7-coordinate geometry to one Rb(1), one Rb(2), one Rb(3), one Rb(4), one Fe(2), and two equivalent Fe(1) atoms. In the second Te site, Te(2) is bonded in a 8-coordinate geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), one Fe(1), and two equivalent Fe(2) atoms. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to one Rb(1), one Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Fe(1) atom. In the fourth Te site, Te(4) is bonded in a distorted body-centered cubic geometry to one Rb(1), two equivalent Rb(2), two equivalent Rb(3), two equivalent Rb(4), and one Fe(2) atom.