Synthesis and characterization of a new class of divalent lanthanide complexes {[C5H4(CMe2Ph)](4)Ln(2)(mu-X)(2)}[Li(DME)(3)](2) (Ln = Sm, X = I; Ln = Yb, X = Cl; DME = dimethoxyethane)

摘要

Synthesis and characterization of a new class of ion-pairs complexes [Ln(2)(PhMe2CC5H4)(4)(mu-X)(2)][Li(DME)(3)](2) (Ln = Sm, X = I; Ln = Yb, X = Cl) are described. The reaction Of SMI2(THF)(2)(THF = tetrahydrofuran) with two equivalents of PhMe2CC5H4Li(DME) in THF affords the Sm(II) complex [SM2(PhMe2CC5H4)(4)(mu-I)(2)][Li(DME)(3)](2) (1), while the Na-K alloy reduction of (PhMe2CC5H4)(2)YbCl, which was formed in situ by the reaction of YbCl3 and PhMe2CC5H4Li in 1:2 molar ratio, gives Yb(II) complex [Yb-2(PhMe2CC5H4)(4)(mu-Cl)(2)][Li(DME)(3)](2) (2). The single-crystal structural analyses of 1 and 2 reveal that they both comprise two Li+ (DME)(3) cations and a new class of dianion, {[C5H4(CMe2Ph)](4)Ln(2)(mu-X)(2)}(6-), in which two [C5H4(CMe2Ph)](2)Ln were bridged together by two iodine atoms for Sm and two chlorine atoms for Yb. The coordination geometry of the central metal is best described as a distorted tetrahedral. (C) 2003 Elsevier B.V. All rights reserved. [References: 38]