EPR as a Tool for Study of Isolated and Coupled Paramagnetic Centers in Coordination Compounds and Macromolecules of Biological Interest

Abstract

Continuous Wave Electron Paramagnetic Resonance (CW EPR) is an essential spectroscopic tool for study of systems containing unpaired electrons. The potential capability of the technique has extended its use beyond being solely by experts, and today it is widely used by non-specialists. In this microreview we present selected examples together with basic theoretical aspects necessary for understanding of the EPR properties of isolated paramagnetic centers and assemblies of them

Histaminol and Its Complexes with Copper(II) – Studies in Solid State and Solution

“…In contrast, for 1 and 2 the intermolecular interactions shown in Figures S1–S4 might – efficiently enough – transmit the isotropic exchange interaction. Moreover, this exchange interaction, although weak, might have a noticeable effect on the EPR spectral properties . The described situation requires a cautious approach.…”

Magnetostructural Characterization of Oxalamide Dihalo‐Bridged Copper Dimers: Intra‐ and Interdimer Interactions Studied by Single‐Crystal Electron Spin Resonance Spectroscopy

“…Despite the very similar structures of the complexes described herein compared with the structures of the complexes previously reported, described by similar X‐ray, magnetization, and powder ESR results, we probed small but significant differences in the magnetic properties by using single‐crystal ESR spectroscopy. Therefore, single‐crystal ESR spectroscopy has proven to be an adequate technique to detect small differences in weak magnetic interactions due to slightly different local environments of the magnetic centers, which are usually not visible by standard characterization techniques …”

A New CuII Coordination Polymer: Structural Elucidation, EPR and Sensing Studies for Detection of Volatile Organic Solvents

“…Finally, it can be noticed that for the spectra measured at 77 K and in DMF or DMSO solution the hyperfine coupling structure is observable but not fully resolved. It is reasonable to assume that the interdimeric exchange interactions – in spite of their weakness – between the non‐fully isolated Cu(II) centers may be responsible for the hyperfine structure collapse in DMF or DMSO solution …”