Er3Ni6Al2H7 crystallizes in the cubic Im-3m space group. Er(1) is bonded in a 4-coordinate geometry to four equivalent H(1) atoms. Ni(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Al(1) and two equivalent H(2) atoms. Al(1) is bonded in a distorted linear geometry to six equivalent Ni(1) and two equivalent H(1) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to three equivalent Er(1) and one Al(1) atom to form a mixture of edge and corner-sharing HEr3Al tetrahedra. In the second H site, H(2) is bonded to four equivalent Ni(1) atoms to form distorted corner-sharing HNi4 tetrahedra.
Er3Ni6Al2H7 crystallizes in the cubic Im-3m space group. Er(1) is bonded in a 4-coordinate geometry to four equivalent H(1) atoms. All Er(1)-H(1) bond lengths are 2.14 Å. Ni(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Al(1) and two equivalent H(2) atoms. Both Ni(1)-Al(1) bond lengths are 2.51 Å. Both Ni(1)-H(2) bond lengths are 1.70 Å. Al(1) is bonded in a distorted linear geometry to six equivalent Ni(1) and two equivalent H(1) atoms. Both Al(1)-H(1) bond lengths are 2.00 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded to three equivalent Er(1) and one Al(1) atom to form a mixture of edge and corner-sharing HEr3Al tetrahedra. In the second H site, H(2) is bonded to four equivalent Ni(1) atoms to form distorted corner-sharing HNi4 tetrahedra.