Abstract A series of new rare-earth ionic liquids, pentanitratoyttrate(III) ionic liquids (1–6), were prepared and fully characterized by 1H and 13CNMR, and IR spectroscopy as well as elemental analysis. The crystal structure of di(1,2,3-trimethylimidazolium) pentanitratoyttrate (Complex 1) was determined by single-crystal X-ray diffraction. The structure features alternating arrangement of [MC1mim]+ cations and ten-coordinated [Y(NO3)5]2– hexadecahedrons. No disordered solvent or water is observed in the crystal lattices. The thermodynamic stability of the new complexes was investigated by TGA and DSC. Four of these yttrium-containing ionic liquids (Complexes 3–6) are typical room temperature ionic liquids. They show high thermal stability and liquidus range of over 300 °C.

中文翻译：

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无水五硝酸酯(III)离子液体的合成、结构与性质

摘要 制备了一系列新型稀土离子液体五硝酸戊酯(III)离子液体(1-6)，并通过1H和13CNMR、红外光谱和元素分析对其进行了充分表征。di(1,2,3-trimethylimidazolium) pentanitratoyttrate (Complex 1) 的晶体结构由单晶 X 射线衍射确定。该结构以[MC1mim]+阳离子和十配位的[Y(NO3)5]2-十六面体交替排列为特征。在晶格中没有观察到无序的溶剂或水。通过TGA和DSC研究了新配合物的热力学稳定性。其中四种含钇离子液体（配合物 3-6）是典型的室温离子液体。它们显示出高热稳定性和超过 300 °C 的液相线范围。