Magneto-chemistry, high field EPR design, magnetic characterization of the trityl radical and on-going projects

Abstract:
This presentation will outline the basics of magnetic characterization using magnetic susceptibility and high field electron paramagnetic resonance (HFEPR). The trityl radical is an interesting compound in its stability and use for magnetic resonance imaging. However its magnetic properties as a concentrated solid have been overlooked and are presented here. This radical is of interest due to its use as a dynamic nuclear polarization agent as well as a potential magnetic refrigerant and quantum computing bit. A novel HFEPR based on Squid detection provides important lifetime and magneto-thermodynics of the HFEPR energy transfer. We determine the quantum parameters, magnetic susceptibility and EPR linewidths as a function of temperature. The results provide information required for theoretical modeling and engineering of the trityl radical for a wide range of applications. On-going projects in the lab will also be discussed.

Co-Authors:
Stephen Russek, National Institute of Standards and Technology, Boulder, CO
Howard J. Halpern, Center for EPR Imaging In Vivo Physiology, University of Chicago
From Illinois Institute of Technology:
McNeely, J. H.; Davis, K.; Sun, Wan Lin; Kamper, Derek; Mogul, David; Khan, Ishaque; Putrevu, Ravikanth; Liu, Liannian; Feng, Mei; Evenhouse, Josh