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Hockless, David C. R.
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article
A simple synthesis and a structural survey of homoleptic rare earth(III) 2,6-diphenylphenoIates
Abstract
<p>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(ni) 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 P}) I, 3,4 and 9, there are additional intramolecular rc-interactions of the phenyl substituents with the metals (n.6-Ph-Ln and rj'-Ph-Ln). The cell parameters for 2, though similar, suggest a different form, and the structure has additional intramolecular n,6-Ph-La and n.3-Ph-La interactions with the capping phenyl groups near parallel.</p>