Tetraalkylphosphonium Polyoxometalate Ionic Liquids: Novel, Organic−Inorganic Hybrid Materials
The Journal of Physical Chemistry B2007Vol. 111(18), pp. 4685–4692
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Paul G. Rickert, Mark R. Antonio, Millicent A. Firestone, Karrie‐Ann Kubatko, Tomasz Szreder, James F. Wishart, Mark L. Dietz
Abstract
Pairing of a Keggin or Lindqvist polyoxometalate (POM) anion with an appropriate tetraalkylphosphonium cation is shown to yield the first members of a new family of ionic liquids (ILs). Detailed characterization of one of them, an ambient-temperature "liquid POM" comprising the Lindqvist salt of the trihexyl(tetradecyl) phosphonium cation, by voltammetry, viscometry, conductimetry, and thermal analysis indicates that it exhibits conductivity and viscosity comparable to those of the one previously described inorganic-organic POM-IL hybrid but with substantially improved thermal stability.
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