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EPR (X-Band) spectra of 1 in toluene at 295 K and 135 K. Numerical fit (red dashed line) to the experimental spectrum at 295 K corresponds to a single nitroxide tetraradical species; correlation coefficient is 0.999 and the values for the variable parameters are: Lorentzian line width of 0.156 mT, g-shift of −0.045 mT (g-value = 2.0059), 14N-splitting of 0.319 mT for 4 nuclei, 1H-splitting of 0.048 mT for 8 nuclei.
