Synthesis, Properties, and Structures of Low-Melting Tetraisocyanatocobaltate(II)-Based Ionic Liquids
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- 作者：Tim Peppel ; Alexander Hinz ; Philipp Thiele ; Monika Geppert-Rybczyńska ; Jochen K. Lehmann and Martin Kö ; ckerling
- 刊名：European Journal of Inorganic Chemistry
- 出版年：2017
- 出版时间：February 03, 2017
- 年：2017
- 卷：2017
- 期：5
- 页码：885-893
- 全文大小：1585K
- ISSN：1099-0682c
文摘
A series of new ionic liquids of the formula Ax[CoII(NCO)4] with the [CoII(NCO)4]2– anion and nitrogen-based organic cations (A) were synthesized. The single-crystal structures of all of the compounds were determined by X-ray diffraction, and the presence of discrete ions was revealed for all cases. At room temperature, these compounds exhibit paramagnetic behavior owing to the presence of high-spin tetrahedrally coordinated CoII ions. The melting points or glass-transition temperatures are in the range for ionic liquids for some of the compounds with singly charged cations and above 100 °C for all compounds with doubly charged cations and the bis(triphenylphosphine)iminium ([PPN]+) salt. Each compound was characterized by elemental analysis as well as NMR, IR, and UV/Vis spectroscopy. Measurements of the density, dynamic viscosity, conductivity, and surface tension of the low-melting substance [EMIm]2[Co(NCO)4] ([EMIm]+ = 1-ethyl-3-methylimidazolium) show that they differ slightly to the corresponding values for the isothiocyanato complexes but are generally comparable.