Use of Electron Paramagnetic Resonance Spectroscopy to Study Dielectric Properties of Liquids

Figure 10

TEMPO reference EPR signal intensity (arbitrary units) as a function of dielectric constant for various solvents (ε = 2.02 cyclohexane, ε = 7.58 tetrahydrofuran, ε = 10.4 dichloroethane, ε = 18.5 methyl ethyl ketone, ε = 24.3 ethanol, ε =3 7.5 acetonitrile, ε = 69.0 propylene carbonate, and ε = 78.0 water). The 4/5 mm coaxial tube assembly was used. Error bars of 3.5% are shown as discussed in the text.