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Sm(OH)3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine equivalent O2- atoms. There are three shorter (2.49 Å) and six longer (2.50 Å) Sm–O bond lengths. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. O2- is bonded in a single-bond geometry to three equivalent Sm3+ and one H1+ atom.
Sm(OH)3 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Sm3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Sm–O bond distances ranging from 2.47–2.59 Å. There are three inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.98 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three equivalent Sm3+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three equivalent Sm3+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to three equivalent Sm3+ and one H1+ atom.
SmO(OH) crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sm3+ is bonded to six O2- atoms to form a mixture of distorted corner and edge-sharing SmO6 octahedra. The corner-sharing octahedral tilt angles are 60°. There are a spread of Sm–O bond distances ranging from 2.27–2.50 Å. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.99 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to three equivalent Sm3+ and one H1+ atom. In the second O2- site, O2- is bonded in a trigonal planar geometry to three equivalent Sm3+ atoms.