Multistimuli responsive soft materials are urgently needed in many different fields, such as anticounterfeiting technology and microdroplet manipulation. Herein, the straightforward preparation of fluorescigenic magnetofluids by the introduction of the paramagnetic metal ions Gd³⁺, Tb³⁺, and Dy³⁺ into alkylimidazolium-based ionic liquids (ILs) is reported. Bright visible fluorescence was observed under UV irradiation for Tb- and Dy-containing ILs. Either pure samples or papers coated with these ILs exhibited pronounced magnetic responses. Consistent and stable structures of these salts were confirmed by systematical characterizations. Because of the competition of nitrate ligands, structural water in the precursors was eliminated easily under a vacuum. For Tb- and Dy-containing ILs, featured electronic transitions were observed and were assigned in the fluorescence spectra. The long lifetimes of these transitions were also confirmed. The field-cooling experiments showed that all of these ILs display paramagnetism at room temperature. At low temperature, small deviations from the Curie Law indicate the occurrence of antiferromagnetic coupling and spin canting in these ILs. Temperature-induced differences in magnetic properties were further verified by field-dependent magnetic susceptibility measurements carried out at 5 and 300 K.

中文翻译：

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基于Ga，Ter和Dy的咪唑鎓盐的荧光致磁流体

在许多不同的领域，如防伪技术和微滴处理，迫切需要多种刺激响应的软材料。在此，通过引入顺磁性金属离子Gd ³⁺，Tb ³⁺和Dy ^3+可以直接制备荧光致磁流体。报道了基于烷基咪唑鎓的离子液体（ILs）。在紫外线照射下，对于含Tb和Dy的ILs观察到了明亮的可见荧光。纯样品或涂有这些IL的纸都表现出明显的磁响应。这些盐的一致和稳定的结构已通过系统表征得到证实。由于硝酸盐配体的竞争，前体中的结构水在真空下很容易消除。对于含Tb和Dy的IL，观察到了特征性的电子跃迁，并在荧光光谱中分配了它们。这些过渡的寿命也很长。现场冷却实验表明，所有这些IL在室温下均显示顺磁性。在低温下 与居里定律的微小偏差表明在这些IL中发生了反铁磁耦合和自旋倾斜。通过在5和300 K下进行的场相关磁化率测量进一步验证了温度引起的磁性能差异。