Th2Ni10Al15 crystallizes in the orthorhombic Immm space group. Th(1) is bonded in a 18-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(1), two equivalent Al(3), two equivalent Al(5), and six equivalent Al(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to two equivalent Th(1), one Ni(3), one Al(3), two equivalent Al(5), and three equivalent Al(1) atoms. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent Th(1), two equivalent Al(1), two equivalent Al(4), and four equivalent Al(3) atoms. In the third Ni site, Ni(3) is bonded in a 2-coordinate geometry to two equivalent Th(1), two equivalent Ni(1), and two equivalent Al(2) atoms. In the fourth Ni site, Ni(4) is bonded in a 8-coordinate geometry to two equivalent Al(3), two equivalent Al(4), and four equivalent Al(5) atoms. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to three equivalent Th(1), one Ni(2), and three equivalent Ni(1) atoms. In the second Al site, Al(2) is bonded in a distorted body-centered cubic geometry to four equivalent Ni(3) and four equivalent Al(5) atoms. In the third Al site, Al(3) is bonded in a 4-coordinate geometry to one Th(1), one Ni(1), one Ni(4), two equivalent Ni(2), and two equivalent Al(4) atoms. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to two equivalent Ni(2), two equivalent Ni(4), one Al(4), two equivalent Al(5), and four equivalent Al(3) atoms. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to one Th(1), two equivalent Ni(1), two equivalent Ni(4), one Al(2), and one Al(4) atom.
Th2Ni10Al15 crystallizes in the orthorhombic Immm space group. Th(1) is bonded in a 18-coordinate geometry to two equivalent Ni(2), two equivalent Ni(3), four equivalent Ni(1), two equivalent Al(3), two equivalent Al(5), and six equivalent Al(1) atoms. Both Th(1)-Ni(2) bond lengths are 3.38 Å. Both Th(1)-Ni(3) bond lengths are 3.35 Å. All Th(1)-Ni(1) bond lengths are 3.05 Å. Both Th(1)-Al(3) bond lengths are 3.38 Å. Both Th(1)-Al(5) bond lengths are 3.23 Å. There are four shorter (3.18 Å) and two longer (3.43 Å) Th(1)-Al(1) bond lengths. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 9-coordinate geometry to two equivalent Th(1), one Ni(3), one Al(3), two equivalent Al(5), and three equivalent Al(1) atoms. The Ni(1)-Ni(3) bond length is 2.54 Å. The Ni(1)-Al(3) bond length is 2.42 Å. Both Ni(1)-Al(5) bond lengths are 2.43 Å. There is one shorter (2.40 Å) and two longer (2.51 Å) Ni(1)-Al(1) bond lengths. In the second Ni site, Ni(2) is bonded in a 8-coordinate geometry to two equivalent Th(1), two equivalent Al(1), two equivalent Al(4), and four equivalent Al(3) atoms. Both Ni(2)-Al(1) bond lengths are 2.65 Å. Both Ni(2)-Al(4) bond lengths are 2.59 Å. All Ni(2)-Al(3) bond lengths are 2.44 Å. In the third Ni site, Ni(3) is bonded in a 2-coordinate geometry to two equivalent Th(1), two equivalent Ni(1), and two equivalent Al(2) atoms. Both Ni(3)-Al(2) bond lengths are 2.45 Å. In the fourth Ni site, Ni(4) is bonded in a 8-coordinate geometry to two equivalent Al(3), two equivalent Al(4), and four equivalent Al(5) atoms. Both Ni(4)-Al(3) bond lengths are 2.55 Å. Both Ni(4)-Al(4) bond lengths are 2.65 Å. All Ni(4)-Al(5) bond lengths are 2.58 Å. There are five inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to three equivalent Th(1), one Ni(2), and three equivalent Ni(1) atoms. In the second Al site, Al(2) is bonded in a distorted body-centered cubic geometry to four equivalent Ni(3) and four equivalent Al(5) atoms. All Al(2)-Al(5) bond lengths are 2.48 Å. In the third Al site, Al(3) is bonded in a 4-coordinate geometry to one Th(1), one Ni(1), one Ni(4), two equivalent Ni(2), and two equivalent Al(4) atoms. Both Al(3)-Al(4) bond lengths are 2.74 Å. In the fourth Al site, Al(4) is bonded in a 11-coordinate geometry to two equivalent Ni(2), two equivalent Ni(4), one Al(4), two equivalent Al(5), and four equivalent Al(3) atoms. The Al(4)-Al(4) bond length is 2.67 Å. Both Al(4)-Al(5) bond lengths are 2.80 Å. In the fifth Al site, Al(5) is bonded in a 4-coordinate geometry to one Th(1), two equivalent Ni(1), two equivalent Ni(4), one Al(2), and one Al(4) atom.