4.6 Article

Tetrahalidometallate(II) Ionic Liquids with More than One Metal: The Effect of Bromide versus Chloride

期刊

CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 64, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202201068

关键词

electrochemistry; ionic liquids; metal-containing ionic liquids; N-butylpyridinium bromide; tetrahalidometallates

资金

  1. University of Potsdam [53170000]
  2. Deutsche Forschungsgemeinschaft [DFG SPP 1708, KO4876/1-1, KO4876/1-2, TA571/13-1, TA571/13-2]
  3. Projekt DEAL

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The study synthesized fifteen N-butylpyridinium salts and investigated their structures, thermal properties, and electrochemical properties. All compounds are ionic liquids with melting points between 64 and 101 degrees C, isostructural, with electrochemical stability windows between 2 and 3 V, and conductivities ranging from 10(-5) to 10(-6) S cm(-1).
Fifteen N-butylpyridinium salts - five monometallic [C4Py](2)[MBr4] and ten bimetallic [C4Py](2)[(M0.5M0.5Br4)-M-a-Br-b] (M=Co, Cu, Mn, Ni, Zn) - were synthesized, and their structures and thermal and electrochemical properties were studied. All the compounds are ionic liquids (ILs) with melting points between 64 and 101 degrees C. Powder and single-crystal X-ray diffraction show that all ILs are isostructural. The electrochemical stability windows of the ILs are between 2 and 3 V. The conductivities at room temperature are between 10(-5) and 10(-6) S cm(-1). At elevated temperatures, the conductivities reach up to 10(-4) S cm(-1) at 70 degrees C. The structures and properties of the current bromide-based ILs were also compared with those of previous examples using chloride ligands, which illustrated differences and similarities between the two groups of ILs.

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