Rare earth elements show unique optical and magnetic properties, with great potential in sensing, imaging, light harvesting, and magnetically responsive materials. In this study, a typical lanthanide terbium based ionic liquid, vinylimidazolium tetranitroterbium (Vim[Tb(NO₃)₄]), and the corresponding polymer, poly(vinylimidazolium tetranitroterbium) (PVim[Tb(NO₃)₄]), are synthesized by introducing terbium into conterions. Vim[Tb(NO₃)₄] and PVim[Tb(NO₃)₄] are characterized by ¹H NMR and negative ion mass spectroscopy. Magnetic property tests show that the monomer and polymer are paramagnetic, and the susceptibility of PVim[Tb(NO₃)₄] is higher than that of Vim[Tb(NO₃)₄]. The corresponding aqueous droplets are deformed by an external magnetic field, and the contact angle changes with the magnetic field intensity and direction, changing the surface tension as a result. Meanwhile, the magnetic monomer and polymer show bright fluorescence under ultraviolet excitation, while there is no color under sunlight. Vim[Tb(NO₃)₄] exhibits stronger fluorescence than PVim[Tb(NO₃)₄] in solution, while pure PVim[Tb(NO₃)₄] exhibits stronger fluorescence than pure Vim[Tb(NO₃)₄]. Noncontact manipulation of aqueous droplets in a dark enviroment is favored for special applications under a strong magnetic field. Therefore, Vim[Tb(NO₃)₄] exhibits better fluorescence performance in solution, while PVim[Tb(NO₃)₄] is more suitable for anti-counterfeiting applications and droplet manipulation.

中文翻译：

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用于防伪和液滴操纵的铽基（聚）离子液体

稀土元素表现出独特的光学和磁性特性，在传感、成像、光捕获和磁响应材料方面具有巨大潜力。本研究合成了一种典型的镧系铽基离子液体乙烯基咪唑铽四硝基铽(Vim[Tb(NO ₃ ) ₄ ])和相应的聚合物聚(乙烯基咪唑铽四硝基铽)(PVim[Tb(NO ₃ ) ₄ ])。通过将铽引入到铽中。Vim[Tb(NO ₃ ) ₄ ]和PVim[Tb(NO ₃ ) _{4 ]通过}¹ H NMR和负离子质谱进行表征。磁性能测试表明单体和聚合物均具有顺磁性，PVim[Tb(NO ₃ ) ₄ ]的磁化率高于Vim[Tb(NO ₃ ) ₄ ]。相应的水滴在外部磁场的作用下发生变形，接触角随着磁场强度和方向的变化而变化，从而改变表面张力。同时，磁性单体和聚合物在紫外激发下表现出明亮的荧光，而在阳光下则无颜色。Vim[Tb(NO ₃ ) ₄ ]在溶液中比 PVim[Tb(NO ₃ ) _{4 ] 表现出更强的荧光，而纯 PVim[Tb(NO 3} ) _{4 ] 比纯 Vim[Tb(NO 3} ) ₄ ]表现出更强的荧光。在强磁场下的特殊应用中，在黑暗环境中对水滴进行非接触操纵是有利的。因此，Vim[Tb(NO ₃ ) ₄ ]在溶液中表现出更好的荧光性能，而PVim[Tb(NO ₃ ) ₄ ]更适合防伪应用和液滴操纵。