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X-band (9.38 GHz) continuous-wave (CW) EPR spectra (10 K) of frozen-solution crystalline samples from the reaction between FeCl2 and SNO− in 1:1 toluene/THF. (A) A full-spectrum shows both S = 3/2 and S = 1/2 signals recorded at 10 K, with 6.325 mW microwave power (non-saturating for S = 3/2 signal). (B) A non-saturating signal for the S = 1/2 species obtained by recording the spectrum at 10 K using a much lower microwave power (0.0006325 mW).
