Th4H15 crystallizes in the cubic I-43d space group. Th(1) is bonded to three equivalent H(2) and nine equivalent H(1) atoms to form a mixture of face and edge-sharing ThH12 cuboctahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a trigonal planar geometry to three equivalent Th(1) atoms. In the second H site, H(2) is bonded to four equivalent Th(1) atoms to form corner-sharing HTh4 tetrahedra.
Th4H15 crystallizes in the cubic I-43d space group. Th(1) is bonded to three equivalent H(2) and nine equivalent H(1) atoms to form a mixture of face and edge-sharing ThH12 cuboctahedra. All Th(1)-H(2) bond lengths are 2.46 Å. There are a spread of Th(1)-H(1) bond distances ranging from 2.29-2.36 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a trigonal planar geometry to three equivalent Th(1) atoms. In the second H site, H(2) is bonded to four equivalent Th(1) atoms to form corner-sharing HTh4 tetrahedra.