Date of Award

2019

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Graduate Group

Chemistry

First Advisor

Eric J. Schelter

Second Advisor

Neil C. Tomson

Abstract

The rare earth elements (La–Lu, Sc and Y) are used in a variety of modern technologies due to their unique optical and magnetic properties. However, extraction and purification of individual rare earth elements is a challenging process that requires significant amounts of energy and generates large quantities of waste. This work focuses on the development of simple, single-step rare earth separation procedures that depend upon a tripodal nitroxide ligand framework. Optimization of solvent conditions for these separations was conducted for targeted rare earth combinations, demonstrating the tunability of the separation procedures. Derivatization of the tripodal ligand framework demonstrated that changing the electronic properties of the rare earth complexes led to modification of their underlying properties, allowing for efficient separations in greener alternative solvents. Preparation of a tris(nitroxide) tripodal, radical proligand was confirmed by magnetometry and electron paramagnetic resonance studies. Reaction of the isolated tri-radical species with different rare earth complexes revealed significantly different reaction rates that allowed for the development of a chelation-driven kinetic separation process for rare earth elements.

Embargoed

Available to all on Thursday, September 15, 2022

Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Included in

Chemistry Commons

Share

COinS