Synthesis of novel lanthanide paramagnetic ionic liquids

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)

James Eugene Knoop (Creator)

Institution

The University of North Carolina at Greensboro (UNCG )

Web Site: http://library.uncg.edu/

Advisor

Daniel Herr

Abstract: Room temperature ionic liquids (RTILs) are bulky and asymmetric organic salts, such as those presented in this work in the form, 1-alkyl-3-methylimidazolium. Typically, RTIL refers to those salts whose melting point is below 100 °C. RTILs can be paired with a wide range of anions, from simple halides to inorganic anions such as hexafluorophosphate, large organic anions like triflates or tosylates, or as in this work, we demonstrate a more exotic anion pairing, to lanthanide-based anions that induce a strong paramagnetic susceptibility to the ionic liquid. Ionic liquids (ILs) have been used for battery electrolytes, cellulose solvents, prepolymer monomers, and have been identified as potential candidates for carbon dioxide absorption. Ionic liquids have many advantages for these applications due to their high thermal stability, low vapor pressure, and practically infinite tunable chemistry. This thesis is inspired by a NASA call to investigate ionic liquids to replace silica gel/zeolite mixtures currently used in their atmosphere revitalization system. We have proposed an application taking advantage of magnetocaloric pumping. However, to pump ILs using an applied magnetic field, the ionic liquids must be paramagnetic. This thesis communicates the synthesis, and characterization of a series of novel paramagnetic ionic liquids paired with lanthanide-based (M = Dy, Gd, Ho) metal halide anions. The thermal, physical, and magnetic properties of these new magnetically susceptible imidazolium-based ionic liquids are characterized by FTIR spectroscopy, NMR spectroscopy, thermogravimetric analysis, elemental analysis, and Evan’s NMR method. [This abstract has been edited to remove characters that will not display in this system. Please see the PDF for the full abstract.]

Synthesis of novel lanthanide paramagnetic ionic liquids
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Created on 8/1/2019
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Additional Information

Publication

Thesis

Language: English

Date: 2019

Keywords

Imidazolium, Ionic Liquid, Lanthanide, Magnetism, Paramagnetic Ionic Liquid, Paramagnetism

Subjects

Paramagnetism

Ionic solutions

Metal halides

Anions

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