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"Independent tuning of acidity and ionicity in protic ionic liquids and their polymers. Comparing Li+
 

Summary: "Independent tuning of acidity and ionicity in protic ionic liquids and their
polymers. Comparing Li+
to H+
transport."
C. A. Angell,
Department of Chemistry and Biochemistry, Arizona State University
Protic ionic liquids (PILs) form an interesting and versatile subclass of the low
temperature ionic liquid field, the exponential expansion of which, in recent times, is well
known. PILs are formed by transfer of protons from a Brønsted acid to a Brønsted base,
and their properties depend strongly on the free energy change accompanying the transfer
(the proton "energy gap")1
. An energy level diagram from which this gap can be
predicted for different acid base combinations has been derived from aqueous pKa data1
,
and recently shown to be almost quantitative, by direct electrochemical interrogation of a
range of PILs2
. Because of the wide variations in possible proton gaps, the "ionicity" of
the PIL subclass is highly variable. Furthermore, (a) although a "pH" cannot be defined
in the absence of H2O solvent, the equivalent "activity" of the proton can be assessed
approximately from the above energy diagram, as the mean of acid and base levels, and

  

Source: Angell, C. Austen - Department of Chemistry and Biochemistry, Arizona State University

 

Collections: Materials Science; Chemistry