Thursday, 26 October 2006
OLCC-McClain (Oakley-Lindsay Center)
98

Effect of solvent on the alkyl conformational order in alkyl methylimidazolium room temperature ionic liquids

Deborah Wright1, Justin Tone-Pah-Hote1, Tara Hill2, Jonathan Morrison1, Joseph Noynaert1, and Michael W. Ducey Jr.1. (1) Missouri Western State University, St. Joseph, MO, (2) Excelsior Springs High School, Exclesior Springs, MO

The effect of solvent identity on alkyl conformational order in a homologous series of alkyl methylimidazolium room temperature ionic liquids (RTILs) is described.  Solvent induced order in the alkyl moieties of methylimidazolium bis(trifluoromethylsulfonyl) imide and bromide salts with alkyl chains ranging from C3 through C7 as measured by T1 relaxation time and νa(CH2) infrared vibrational mode indicate subtle variations in chain mobility/ conformation as a function of solvent.  Correlations are made between 1H and 13C T1 measurements for the terminal methyl and methylene units, as well as with the corresponding virbrational measurements.  Solvents with a wide range of solvatochromic parameter values were employed in the study.  While the relative conformational order is observed to vary with solvent properties, the mechanism(s) responsible remain unclear.  This work has been performed almost entirely by undergraduate students at Missouri Western State University over the past two summers.


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