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Introduction

Electron paramagnetic resonance (EPR), is used in our laboratory to characterize paramagnetic species (including organic free radicals) containing one or more unpaired electrons. The use of this technique allows to determine the electronic properties, the life time and the reactivity of the radical species in question. EPR spectroscopy is also used for the study of supramolecular architectures through the introduction of suitable paramagnetic probes. In this way it is possible to obtain information about non-covalent complexes that are complementary to those obtained with traditional spectroscopy techniques.