(Butane-1,2,3,4-tetraol-κ³O¹,O²,O³)(ethanol-κO)tris­(nitrato-κ²O,O′)erbium(III)

In the title Er^III–erythritol complex, [Er(NO₃)₃(C₂H₅OH)(C₄H₁₀O₄)], the Er^III cation is chelated by one erythritol mol­ecule, three nitrate anions and an ethanol mol­ecule, completing an irregular ErO₁₀ coordination geometry. The Er—O bond lengths are in the range 2.348 (3)–2.583 (3) Å. In the crystal, extensive O—H...O hydrogen bonding links the mol­ecules into a three-dimensional supra­molecular structure.