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Structural characterization and reactivity studies of the Samarium aryloxide complex Sm(O-2,6-Pri2C6H3) 3(THF)2
Clark, David L.,Gordon, John C.,Watkin, John G.,Huffman, John C.,Zwick, Bill D.
, p. 2279 - 2289 (1996)
Reaction of the samarium aryloxide bis-THF adduct Sm(OAr)3(THF)2 (1; Ar = 2,6-Pri2C6H3) with two equivalents of pyridine produces the bis-pyridine complex Sm(OAr)3py2 (2) in 85% yield. Compound 1 also reacts with an excess of pyridine to form the tris-pyridine adduct Sm(OAr)3py3 (3) in excellent yield. Addition of one equivalent of KOAr to 1 leads to the isolation of the potassium salt K[Sm(OAr)4] (4) in high yield. The salt 4 reacts with one equivalent of pyridine to form the mono-pyridine adduct K[Sm(OAr)4py] (5). Compounds 1-5 have been characterized by 1H NMR and IR spectroscopy, elemental analysis and, in the case of 1, by a single-crystal X-ray diffraction study. In the solid state, 1 adopts a trigonal bipyramidal structure in which THF ligands occupy axial sites. Sm - O distances to the aryloxide ligands average 2.14(2) A, while those to THF ligands average 2.45(2) A.
