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The title compound, [Gd(C 11 H 7 O 4 ) 3 (C 2 H 5 OH)(H 2 O)]·C 2 H 5 OH, was crystallized from ethanol, affording a solvate. The main ligand in the complex results from deprotonation of the hydroxy group in 3-acetyl-4-hydroxycoumarin (C 11 H 8 O 4 ) and the resulting anionic ligands chelate the Gd III  centre. Three anions, one ethanol and one water molecule are bonded to the lanthanide, giving an eight-coordinate metal centre with a slightly distorted trigonal–prismatic square-face-bicapped coordination geometry. All water and ethanol molecules participate in an intricate three-dimensional framework of hydrogen bonds. The complex is isostructural to the Tb and Dy compounds reported previously [Guzmán-Méndez  et al.  (2018).  Inorg. Chem.  57 , 908–911].

Aquatris[1-(2,4-dioxo-2H-1-benzopyran-3-ylidene)ethan-1-olato]ethanolgadolinium(III) ethanol monosolvate