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Reactions of 2,6-diphenylphenol (HOdpp) and rare earth metals, in the presence of mercury, at elevated temperatures in sealed tubes followed by extraction with toluene yielded homoleptic tris(aryloxo)lanthanoid() complexes, [Ln(Odpp) 3 ] (Ln = Y (1), La (2), Ce (3), Pr (4), Nd (5), Gd (6), Ho (7), Er (8), Lu ( 9)). Single crystal X-ray diffraction studies of 1-4 and 9 established monomeric structures with the coordination sphere comprising a triangular array of Odpp oxygen atoms with capping phenyl groups above and below. In the isomorphous (triclinic P1 ¯) 1, 3, 4 and 9, there are additional intramolecular π-interactions of the phenyl substituents with the metals (η 6 -Ph-Ln and η 1 -Ph-Ln). The cell parameters for 2, though similar, suggest a different form, and the structure has additional intramolecular η 6 -Ph-La and η 3 -Ph-La interactions with the capping phenyl groups near parallel.

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