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Eu(OH)3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Eu3+ is bonded in a 9-coordinate geometry to nine equivalent O2- atoms. There are six shorter (2.50 Å) and three longer (2.51 Å) Eu–O bond lengths. H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. O2- is bonded in a single-bond geometry to three equivalent Eu3+ and one H1+ atom.
Eu(OH)3 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Eu3+ is bonded in a 9-coordinate geometry to nine O2- atoms. There are a spread of Eu–O bond distances ranging from 2.48–2.75 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 0.98 Å. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 0.97 Å. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three equivalent Eu3+ and one H1+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to three equivalent Eu3+ and one H1+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to three equivalent Eu3+ and one H1+ atom.
EuHO3 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Eu is bonded in a 9-coordinate geometry to nine O atoms. There are a spread of Eu–O bond distances ranging from 2.30–2.53 Å. H is bonded in a single-bond geometry to one O atom. The H–O bond length is 0.98 Å. There are three inequivalent O sites. In the first O site, O is bonded in a trigonal non-coplanar geometry to three equivalent Eu atoms. In the second O site, O is bonded in a trigonal non-coplanar geometry to three equivalent Eu atoms. In the third O site, O is bonded in a single-bond geometry to three equivalent Eu and one H atom.