[(2R,3S)-Butane-1,2,3,4-tetraol-κ³O¹,O²,O³](ethanol-κO)tris­(nitrato-κ²O,O′)samarium(III)

The title Sm^III–erythritol complex, [Sm(NO₃)₃(C₂H₆O)(C₄H₁₀O₄)], is isotypic with its Nd, Eu, Y, Gd, Tb and Ho analogues. The Sm^III cation exhibits a coordination number of ten and is chelated by a tridentate erythritol ligand and three bidentate nitrate anions. It is additionally coordinated by an O atom of an ethanol mol­ecule, completing an irregular coordination sphere. The Sm—O bond lengths range from 2.416 (2) to 2.611 (2) Å. In the crystal, extensive O—H...O hydrogen bonding involving all hy­droxy groups and some of the nitrate O atoms links the mol­ecules into a three-dimensional network.