A. Abouserie, K. Zehbe, P. Metzner, A. Kelling, C. Günter, U. Schilde, P. Strauch, T. Körzdörfer, A. Taubert
Alkylpyridinium Tetrahalidometallate Ionic Liquids and Ionic Liquid Crystals: Insights into the Origin of Their Phase Behavior
Eur. J. Inorg. Chem. 2017, 5640-5649
DOI: 10.1002/ejic.201700826
Six N-alkylpyridinium salts [CnPy]2[MCl4] (n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C4Py]4[MCl4] compounds are monoclinic and crystallize in the space group P21/n. The crystals of the longer chain analogues [C12Py]2[MCl4] are triclinic and crystallize in the space group P1. Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single-crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl4]2– ions in the Cu-based ILs have a distorted tetrahedral geometry.
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