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在稀土有机化学中,[Cp_2LnCl]_2和[Cp_2LnCl_2LiL_2][Cp为取代或未取代的环戊二烯基,Ln为稀土离子(III),L为Lewis碱]型化合物是重要的中间物。对含锂烷基、芳基或烯丙基稀土化合物的研究也有着重要的意义。这类分子中含有型桥键结构。由于这类化合物难于结晶及其不稳定性,故很难进行系统的研究。 Rossmanith首先发现了NdCl_3-LiCl-THF溶液的存在。李毅用这一溶液很方便地合成了几个轻稀土-锂双金属有机化合物。但是,在稀土配位化学中,对氯化稀土-氯化锂配合物的研究还很少,对LnCl_3LiCl-THF溶液的认识也有待深化。本文合成了组成为(LaCl)DME(μ_2-Cl)_5(μ_3-Cl)(La·DME)Li(THF)_2的新型桥式链状配合物,并测定了晶体结构。这种类型的稀土双金属配合物尚未见报道。
In rare earth organic chemistry, [Cp_2LnCl] _2 and [Cp_2LnCl_2LiL_2] [Cp is a substituted or unsubstituted cyclopentadienyl group, Ln is a rare earth ion (III) and L is a Lewis base] type compound is an important intermediate. Research on lithium-containing alkyl, aryl or allyl rare earth compounds is also of great significance. These molecules contain type bridged structure. Due to the difficulty of crystallization and instability of these compounds, it is difficult to conduct systematic research. Rossmanith first found the existence of NdCl_3-LiCl-THF solution. Li Yi with this solution is very easy to synthesize a few light rare earth - lithium bimetallic organic compounds. However, rare earth coordination chemistry, the rare earth chloride - lithium chloride complex research, the understanding of LnCl_3LiCl-THF solution needs to be deepened. In this paper, a new type of bridged complex with (LaCl) DME (μ_2-Cl) _5 (μ_3-Cl) (La · DME) Li (THF) _2 was synthesized and its crystal structure was determined. This type of rare earth bimetallic complexes have not been reported.