Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Superacidic Ionic liquids: properties and applications. C. A. Angell, J.P. Belieres, J. Blanchard, B. R. Cherry, G. P. Holland, J. L. Yarger
 

Summary: Superacidic Ionic liquids: properties and applications.
C. A. Angell, J.P. Belieres, J. Blanchard, B. R. Cherry, G. P. Holland, J. L. Yarger
Most of the exponentially increasing output of research on low melting ionic liquids has
focused on aprotic organic cations combined with anions of strong and super acids, in the
search for low melting systems that combine high thermal stability and low vapor
pressure systems with low viscosity. Protic ionic liquids1,2
, which have lower thermal
stabilities, have been given less attention, an exception being Walden's original case,
ethylammonium nitrate, which has been attractive because of its many water-like solvent
characteristics3
. However protic ionic liquids are intrinsically more interesting from a
chemical point of view because of the additional variable, the proton activity, that is
available4,5
. This generates the equivalent of an aqueous pH, but is not limited by the
solvent leveling effect of aqueous acid solutions. The proton activity is controlled by a
combination of the acid and base strengths of the generating molecules (accessible as the
mean pKa value) while the thermal stability is controlled by the energy gap between them
(thus pKa). A proton free energy level diagram constructed on these ideas4
has allowed
the design of neutral and basic electrolytes which have been used for fuel cell studies6

  

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

 

Collections: Materials Science; Chemistry