Tm3WB7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 11-coordinate geometry to two equivalent B(2), two equivalent B(4), three equivalent B(1), and four equivalent B(3) atoms. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to one B(4), four equivalent B(2), and six equivalent B(1) atoms. W(1) is bonded in a 10-coordinate geometry to two equivalent B(4), four equivalent B(2), and four equivalent B(3) atoms. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to three equivalent Tm(1), three equivalent Tm(2), one B(2), and two equivalent B(1) atoms. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), two equivalent W(1), one B(1), one B(2), and one B(3) atom. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Tm(1), two equivalent W(1), one B(2), one B(3), and one B(4) atom. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to one Tm(2), four equivalent Tm(1), two equivalent W(1), and two equivalent B(3) atoms.
Tm3WB7 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Tm sites. In the first Tm site, Tm(1) is bonded in a 11-coordinate geometry to two equivalent B(2), two equivalent B(4), three equivalent B(1), and four equivalent B(3) atoms. Both Tm(1)-B(2) bond lengths are 2.62 Å. Both Tm(1)-B(4) bond lengths are 2.65 Å. There is one shorter (2.62 Å) and two longer (2.71 Å) Tm(1)-B(1) bond lengths. There are two shorter (2.63 Å) and two longer (2.65 Å) Tm(1)-B(3) bond lengths. In the second Tm site, Tm(2) is bonded in a 10-coordinate geometry to one B(4), four equivalent B(2), and six equivalent B(1) atoms. The Tm(2)-B(4) bond length is 3.31 Å. All Tm(2)-B(2) bond lengths are 2.62 Å. There are four shorter (2.68 Å) and two longer (2.70 Å) Tm(2)-B(1) bond lengths. W(1) is bonded in a 10-coordinate geometry to two equivalent B(4), four equivalent B(2), and four equivalent B(3) atoms. Both W(1)-B(4) bond lengths are 2.33 Å. All W(1)-B(2) bond lengths are 2.36 Å. All W(1)-B(3) bond lengths are 2.34 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a 9-coordinate geometry to three equivalent Tm(1), three equivalent Tm(2), one B(2), and two equivalent B(1) atoms. The B(1)-B(2) bond length is 1.81 Å. Both B(1)-B(1) bond lengths are 1.96 Å. In the second B site, B(2) is bonded in a 9-coordinate geometry to two equivalent Tm(1), two equivalent Tm(2), two equivalent W(1), one B(1), one B(2), and one B(3) atom. The B(2)-B(2) bond length is 1.95 Å. The B(2)-B(3) bond length is 1.91 Å. In the third B site, B(3) is bonded in a 9-coordinate geometry to four equivalent Tm(1), two equivalent W(1), one B(2), one B(3), and one B(4) atom. The B(3)-B(3) bond length is 1.81 Å. The B(3)-B(4) bond length is 1.82 Å. In the fourth B site, B(4) is bonded in a 9-coordinate geometry to one Tm(2), four equivalent Tm(1), two equivalent W(1), and two equivalent B(3) atoms.