Electron paramagnetic resonance imaging (EPRI) is a promising imaging technique that uses the magnetic response of unpaired electrons for detection of local chemistry. State of the art molecular imaging probes for EPRI include organic radicals, but not metal complexes. Open-shell metal complexes have many potential advantages as EPRI probes: they have diverse and tunable chemical reactivities, for one, but they also possess a property known as zero field splitting, which can enable safe, low-frequency EPRI at high magnetic field. Despite this promise, metal complexes are relatively unexplored for the technique. Indeed, the low-frequency EPR properties and spectra for many metal ions are, to this day, completely unmapped. In this talk, I will discuss our recent work at understanding what molecular structure features affect the low-frequency EPR spectra of open-shell metal complexes, as well as how local environment influences the spectral shape.

Exploring the low-frequency EPR blindspot of open-shell metal complexes

ACS Spring 2022

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