5 years ago

Synthesis and Characterization of Bromoaluminate Ionic Liquids

Synthesis and Characterization of Bromoaluminate Ionic Liquids
Ingo Krossing, Michael Hog, Marius Schneider
Twelve bromoaluminate based ionic liquids (ILs) were synthesized and characterized by IR, Raman, and NMR spectroscopy, as well as single crystal X-ray diffraction in part. Their principal physicochemical properties including melting points, conductivities, viscosities, and densities were determined and compared with related ILs. The influence of the cation and anion on the physicochemical properties are discussed. The [AlBr4]−based salts are—with one exception—solid at room temperature, while the compounds based on the anion [Al2Br7]− are liquid at room temperature. The liquid salts show low viscosities (49–139 mPa s), medium to high conductivities (0.76–3.53 mS cm−1) and high densities (1.82–2.04 g cm−3) at 28 °C. Furthermore, we showed aluminum electrodeposition from Lewis acidic ILs based on AlBr3 and 1-hexyl-3-methylimidazolium bromide and investigated the stability range of various formulations. A series of twelve bromoaluminate ionic liquids were synthesized by mixing aluminum bromide with different bromides (see figure). The key features of the seven at RT liquid salts are low viscosities (49–139 mPa s), mid to good conductivities (0.76–3.53 mS cm−1) and high densities (1.82–2.04 g cm−3) at 28 °C. Aluminum can be electrodeposited from Lewis acidic mixtures based on AlBr3 and 1-hexyl-3-methylimidazolium bromide.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201700105

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