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Arliguie T, Doux M, Mezailles N, Thuery P, Le Floch P, Ephritikhine M: Lanthanide and uranium complexes with an SPS-based pincer ligand. . Inorg Chem. 2006 Nov 27;45(24):9907-13.
Reactions of Ln (BH4) 3 (THF) n and [Li (Et2O)] SPS (Me)], the lithium salt of an anionic SPS pincer ligand composed of a central hypervalent lambda4-phosphinine ring bearing two ortho-positioned diphenylphosphine sulfide sidearms, led to the monosubstituted compounds [Ln (BH4) 2 (SPS (Me))(THF) 2] [Ln = Ce (1), Nd (2)], while the homoleptic complexes [Ln (SPS (Me)) 3] [Ln = Ce (3), Nd (4)] were obtained by treatment of LnX3 (X = I, BH4) with [K (Et2O)][SPS (Me)]. The [UX2 (SPS (Me)) 2] complexes [X = Cl (5), BH4 (6)] were isolated from reactions of UX4 and the lithium or potassium salt of the [SPS (Me)]- anion. The X-ray crystal structures of 1.1.5THF, 2.1.5THF, 3.2THF.2Et2O, and 5.4py reveal that the flexible tridentate [SPS (Me)]- anion is bound to the metal as a tertiary phosphine with electronic delocalization within the unsaturated parts of the ligand. |
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