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Protic Ionic Liquids: Preparation, Characterization, and Proton Free Energy Level Representation
 

Summary: Protic Ionic Liquids: Preparation, Characterization, and Proton Free Energy Level
Representation
Jean-Philippe Belieres and C. Austen Angell*
Department of Chemistry and Biochemistry, Arizona State UniVersity, Tempe Arizona 85287-1604
ReceiVed: NoVember 15, 2006; In Final Form: January 23, 2007
We give a perspective on the relations between inorganic and organic cation ionic liquids (ILs), including
members with melting points that overlap around the borderline 100 C. We then present data on the synthesis
and properties (melting, boiling, glass temperatures, etc.) of a large number of an intermediate group of
liquids that cover the ground between equimolar molecular mixtures and ILs, depending on the energetics of
transfer of a proton from one member of the pair to the other. These proton-transfer ILs have interesting
properties, including the ability to serve as electrolytes in solvent-free fuel cell systems. We provide a basis
for assessing their relation to aprotic ILs by means of a Gurney-type proton-transfer free energy level diagram,
with approximate values of the energy levels based on free energy of formation and pKa data. The energy
level scheme allows us to verify the relation between solvent-free acidic and basic electrolytes, and the familiar
aqueous variety, and to identify neutral protic electrolytes that are unavailable in the case of aqueous systems.
Introduction
Ionic liquids (ILs), and particularly room-temperature ILs,
have attracted much attention in recent years, and many new
applications beyond green chemistry continue to be found. They
are the low-melting relatives of molten salts whose place in

  

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

 

Collections: Materials Science; Chemistry