TbWFe11 crystallizes in the orthorhombic Imm2 space group. Tb(1) is bonded in a 20-coordinate geometry to one W(1), one Fe(5), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(6), four equivalent Fe(3), and eight equivalent Fe(4) atoms. W(1) is bonded in a 14-coordinate geometry to one Tb(1), one Fe(5), two equivalent Fe(2), two equivalent Fe(3), four equivalent Fe(4), and four equivalent Fe(6) atoms. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Tb(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(4) atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with eight equivalent Fe(4)Tb2Fe9W cuboctahedra, edges with two equivalent Fe(1)Tb2Fe10 cuboctahedra, edges with four equivalent Fe(4)Tb2Fe9W cuboctahedra, and faces with eight equivalent Fe(4)Tb2Fe9W cuboctahedra. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Tb(1), two equivalent W(1), two equivalent Fe(3), two equivalent Fe(6), and four equivalent Fe(4) atoms. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Tb(1), one W(1), one Fe(1), one Fe(2), one Fe(5), two equivalent Fe(6), and four equivalent Fe(4) atoms. In the fourth Fe site, Fe(4) is bonded to two equivalent Tb(1), one W(1), one Fe(1), one Fe(2), one Fe(5), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(6) atoms to form distorted FeTb2Fe9W cuboctahedra that share corners with two equivalent Fe(1)Tb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Tb2Fe9W cuboctahedra,  an edgeedge with one Fe(1)Tb2Fe10 cuboctahedra, edges with four equivalent Fe(4)Tb2Fe9W cuboctahedra, faces with two equivalent Fe(1)Tb2Fe10 cuboctahedra, and faces with six equivalent Fe(4)Tb2Fe9W cuboctahedra. In the fifth Fe site, Fe(5) is bonded in a distorted single-bond geometry to one Tb(1), one W(1), two equivalent Fe(1), two equivalent Fe(3), four equivalent Fe(4), and four equivalent Fe(6) atoms. In the sixth Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Tb(1), two equivalent W(1), one Fe(1), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(4) atoms.
TbWFe11 crystallizes in the orthorhombic Imm2 space group. Tb(1) is bonded in a 20-coordinate geometry to one W(1), one Fe(5), two equivalent Fe(1), two equivalent Fe(2), two equivalent Fe(6), four equivalent Fe(3), and eight equivalent Fe(4) atoms. The Tb(1)-W(1) bond length is 3.19 Å. The Tb(1)-Fe(5) bond length is 2.99 Å. Both Tb(1)-Fe(1) bond lengths are 3.03 Å. Both Tb(1)-Fe(2) bond lengths are 3.08 Å. Both Tb(1)-Fe(6) bond lengths are 3.04 Å. All Tb(1)-Fe(3) bond lengths are 3.02 Å. There are four shorter (3.20 Å) and four longer (3.26 Å) Tb(1)-Fe(4) bond lengths. W(1) is bonded in a 14-coordinate geometry to one Tb(1), one Fe(5), two equivalent Fe(2), two equivalent Fe(3), four equivalent Fe(4), and four equivalent Fe(6) atoms. The W(1)-Fe(5) bond length is 2.36 Å. Both W(1)-Fe(2) bond lengths are 2.64 Å. Both W(1)-Fe(3) bond lengths are 2.61 Å. All W(1)-Fe(4) bond lengths are 2.63 Å. All W(1)-Fe(6) bond lengths are 2.87 Å. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent Tb(1), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(6), and four equivalent Fe(4) atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with eight equivalent Fe(4)Tb2Fe9W cuboctahedra, edges with two equivalent Fe(1)Tb2Fe10 cuboctahedra, edges with four equivalent Fe(4)Tb2Fe9W cuboctahedra, and faces with eight equivalent Fe(4)Tb2Fe9W cuboctahedra. Both Fe(1)-Fe(3) bond lengths are 2.75 Å. Both Fe(1)-Fe(5) bond lengths are 2.58 Å. Both Fe(1)-Fe(6) bond lengths are 2.60 Å. All Fe(1)-Fe(4) bond lengths are 2.43 Å. In the second Fe site, Fe(2) is bonded in a 12-coordinate geometry to two equivalent Tb(1), two equivalent W(1), two equivalent Fe(3), two equivalent Fe(6), and four equivalent Fe(4) atoms. Both Fe(2)-Fe(3) bond lengths are 2.70 Å. Both Fe(2)-Fe(6) bond lengths are 2.62 Å. All Fe(2)-Fe(4) bond lengths are 2.43 Å. In the third Fe site, Fe(3) is bonded in a 12-coordinate geometry to two equivalent Tb(1), one W(1), one Fe(1), one Fe(2), one Fe(5), two equivalent Fe(6), and four equivalent Fe(4) atoms. The Fe(3)-Fe(5) bond length is 2.64 Å. Both Fe(3)-Fe(6) bond lengths are 2.61 Å. There are two shorter (2.43 Å) and two longer (2.47 Å) Fe(3)-Fe(4) bond lengths. In the fourth Fe site, Fe(4) is bonded to two equivalent Tb(1), one W(1), one Fe(1), one Fe(2), one Fe(5), two equivalent Fe(3), two equivalent Fe(4), and two equivalent Fe(6) atoms to form distorted FeTb2Fe9W cuboctahedra that share corners with two equivalent Fe(1)Tb2Fe10 cuboctahedra, corners with ten equivalent Fe(4)Tb2Fe9W cuboctahedra,  an edgeedge with one Fe(1)Tb2Fe10 cuboctahedra, edges with four equivalent Fe(4)Tb2Fe9W cuboctahedra, faces with two equivalent Fe(1)Tb2Fe10 cuboctahedra, and faces with six equivalent Fe(4)Tb2Fe9W cuboctahedra. The Fe(4)-Fe(5) bond length is 2.58 Å. Both Fe(4)-Fe(4) bond lengths are 2.35 Å. There is one shorter (2.60 Å) and one longer (2.61 Å) Fe(4)-Fe(6) bond length. In the fifth Fe site, Fe(5) is bonded in a distorted single-bond geometry to one Tb(1), one W(1), two equivalent Fe(1), two equivalent Fe(3), four equivalent Fe(4), and four equivalent Fe(6) atoms. All Fe(5)-Fe(6) bond lengths are 2.91 Å. In the sixth Fe site, Fe(6) is bonded in a 14-coordinate geometry to one Tb(1), two equivalent W(1), one Fe(1), one Fe(2), one Fe(6), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(4) atoms. The Fe(6)-Fe(6) bond length is 2.40 Å.