Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a technique for studying chemical species that have one or more unpaired electrons, such as organic and inorganic free radicals or inorganic complexes possessing a transition metal ion. The basic physical concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of spins of atomic nuclei. So you can measure molecules that have a nuclear or electron spin. The characteristic curve of a EPR or ESR spectrum gives you structural information about your material. The transfer of one or more electrons by an in situ spectroelectrochemical experiment let you follow up a structural change at a electrode reaction.

ESR2

EPR spectrum of N@ C60 Fullerene

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Department Electrochemistry and conducting polymers

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