稀土金属离子液体的合成与结构
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摘要
离子液体近年来被化学和材料学科诸多前沿领域关注,这得益于离子液体在作为功能液体材料方面的优势。液体稀土材料在激光发射器、磁流体、电池电解液等高科技领域有潜在应用,然而高稀土浓度、物化性质均一稳定的无水液体稀土材料却很少见。将稀土元素以化学组分的形式设计成稀土离子液体,将有可能结合离子液体和稀土金属的各自特点,获得与溶液材料性能迥异的新型液体稀土材料。然而,稀土元素具有较多的外层电子,易形成体积较大的配合物。如何有效地将这类内部相互作用复杂的配合物结构设计成室温液体,并能获得稳定的物化性质,这对于功能化离子液体的设计构成重要挑战。我们近五年来持续设计硝酰稀土金属酸盐离子液体体系,系统开展其合成与结构组成研究,成功制备了包含从镧到镥所有稀土组分的离子液体,用多种结构表征手段进行了结构组成分析,并得到了每种组分的精确晶体结构。~([1-4])这些离子液体具有优异的耐水性和化学稳定性,是一类稳定的非水液体稀土材料。
In recent years, ionic liquids have drawn attentions of many frontier fields of chemistry and materials science as functional liquid materials. Liquid rare earth materials have potential applications in many high-tech fields such as laser transmitter, magnetic fluid, and battery electrolyte, etc. However, the types of anhydrous liquid rare earth materials with uniform and stable physiochemical properties and high concentration of rare earth are extremely rare. Rare earth ionic liquids designed with the rare earth composition will be combined with the characteristics of ionic liquids and rare earths, owing different properties comparing with rare earth solution materials. However, it is an important challenge for the design of functionalized ionic liquids to effectively introduce the rare earth complex structure. In the past five years, we focused on the design of nitratolanthanate ionic liquids system. Many nitratolanthanate ionic liquids were successfully prepared containing all lanthanides from lanthanum to lutetium. Their precise structures were obtained from the single crystals. These ionic liquids have excellent water resistance and chemical stability, which are a kind of stable nonaqueous liquid rare earth materials.
引文
[1]Ji,S.P.;Tang,M.;He,L.;Tao,G.H.Chem.Eur.J.2013,19:4452.
    [2]He,L.;Ji,S.P.;Tang,N.;Zhao,Y.;Tao,G.H.Dalton Trans.2015,44:2325.
    [3]Tang,N.;Zhao,Y.;He,L.;Yuan,W.L.;Tao,G.H.Dalton Trans.2015,44:8816.
    [4]Zhao,Y.;He,L.;Tang,N.;Qin,S.;Tao,G.H.;Liang,F.X.Eur.J.Inorg.Chem.2015:542.

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