Abstract
Interaction of anhydrous lanthanide(III) chlorides (Ln=Nd, Sm, Eu) with 3 equiv. of lithium bis(trimethylsilyl)amide (Me 3Si) 2NLi in THF, followed by recrystallization from toluene, produced tetracoordinate lanthanide amides [(Me 3Si) 2N] 3Ln(μ-Cl)Li(THF) 3 (Ln=Nd ( 1), Sm ( 2), Eu ( 3)). Sublimation of 1, 2 and 3 afforded the corresponding complexes [(Me 3Si) 2N] 3Ln (Ln=Nd, Sm, Eu). The structures of complexes 2 and 3 were determined by the single-crystal X-ray diffraction. These complexes can function as single-component MMA polymerization catalysts in THF, DME, toluene and n-hexane. It was found that the activities of the catalysts, stereo-regularity of PolyMMA, and the molecular weight of polymers were dependent on the solvents, temperatures, and the catalyst/MMA mole ratios.
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