Al(OH)3 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 43-51°. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(2) atoms. In the third H site, H(3) is bonded in a linear geometry to two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Al(1) and one H(1) atom. In the second O site, O(2) is bonded to two equivalent Al(1), one H(2), and one H(3) atom to form distorted corner-sharing OAl2H2 tetrahedra.
Al(OH)3 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to two equivalent O(1) and four equivalent O(2) atoms to form corner-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles range from 43-51°. Both Al(1)-O(1) bond lengths are 1.89 Å. There are two shorter (1.93 Å) and two longer (2.00 Å) Al(1)-O(2) bond lengths. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.99 Å. In the second H site, H(2) is bonded in a linear geometry to two equivalent O(2) atoms. Both H(2)-O(2) bond lengths are 1.23 Å. In the third H site, H(3) is bonded in a linear geometry to two equivalent O(2) atoms. Both H(3)-O(2) bond lengths are 1.25 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Al(1) and one H(1) atom. In the second O site, O(2) is bonded to two equivalent Al(1), one H(2), and one H(3) atom to form distorted corner-sharing OAl2H2 tetrahedra.