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In the title compound, [Tm(C 6 H 5 Se) 3 (C 4 H 8 O) 3 ], the Tm III  atom lies on a threefold rotation axis and is coordinated by three phenyl­seleno­late ligands and three tetra­hydro­furan ligands leading to a distorted  fac -octa­hedral coordination environment. The Tm—Se and Tm—O bond lengths are 2.7692 (17) and 2.345 (10) Å, respectively, and the bond angles are 91.32 (6)° for Se—Tm—Se, 92.6 (2) and 94.4 (2)° for Se—Tm—O, and 81.2 (3)° for O—Tm—O. In the crystal, the discrete complexes are linked by van der Waals inter­actions only. The crystal was refined as a non-merohedral twin (ratio = 0.65:0.35).

Crystal structure of tris(phenylselenolato-κSe)tris(tetrahydrofuran-κO)thulium(III)