Crystal packing and the hows and whys of ionic liquids

I&EC 7

Wesley A. Henderson, henderso@usna.edu1, Stefano Passerini2, Victor G Young Jr., young@chem.umn.edu3, Hugh C. De Long4, and Paul C. Trulove, trulove@usna.edu1. (1) Department of Chemistry, United States Naval Academy, 572 M Holloway Road (Stop 9B), Annapolis, MD 21402, (2) ENEA, Casaccia Research Center, Via Anguillarese 301, Rome, 00060, Italy, (3) Chemistry Department, University of Minnesota, 207 Pleasant St. S.E, Minneapolis, MN 55455, (4) Directorate of Chemistry and Life Sciences, Air Force Office of Scientific Research, 875 North Randolph Street, Suite 325, Room 3112, Arlington, VA 22203-1768
It is still not well understood what factors govern the melting point of a salt. To explore this, we have scrutinized the ion crystal packing (via crystal structures) of N-alkyl-N-methylpyrrolidinium (PYR1R+), piperidinium (PIP1R+) and morpholinium (MORP1R+) salts. This permits an examination of the influence of changes to the cation alkyl groups, ring size and the presence of heteroatoms on ion interactions and salt thermal properties. Raman and NMR spectroscopy have provided complementary information regarding the conformations and disorder of the ions with varying temperature. Taken together, these create a comprehensive picture of the hows and whys for solid-solid phase changes and melting of the salts.
 

Ionic Liquids: Not Just Solvents Anymore OR Ionic Liquids: Parallel Futures (Sponsored by Green Chemistry and Engineering, Separation Science and Technology and Novel Chemistry with Industrial Applications Sub-Divisions)
8:15 AM-12:25 PM, Sunday, 26 March 2006 Georgia World Congress Center -- B314, Oral

Division of Industrial and Engineering Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006