EPR measurements in copper saccharinate single crystals

Electron paramagnetic resonance measurements have been performed in single crystals of copper(II) saccharinate, [Cu(C7H4NO3S)2(H2O)4].2H2O, as a function of the magnetic field orientation. The characteristics of the spectra are dominated by the exchange narrowing phenomenon which partially collapses the hyperfine structure, and the resonances due to magnetically different copper ions in the unit cell. The data are used to estimate the magnitude of the exchange couplings between copper ions in the compound and the results are discussed in terms of the structural data.