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. 2021 Sep 23;7(10):1751–1755. doi: 10.1021/acscentsci.1c00890

Figure 2.

Figure 2

(a) X-band EPR spectrum (toluene, 12 K). Conditions: microwave frequency, 9.375 GHz; field modulation amplitude 10 G. Fit (red) employs S = 1/2, g = [g1, g2, g3] = [2.062, 2.045, 2.012], line widths (hwhm/Gaussian) 100, 40, 20 MHz; (b) solid-state zero-field 57Fe Mössbauer spectrum at 80 K. Black circles, experiment; red line with δ, −0.149 mm s–1; ΔEQ, 1.94 mm s–1; blue line PhB(AdIm)3FeOH (3) impurity; (c) Q-band pulsed ENDOR (black traces) at g = 2.011 of (top) 11B resonances, centered at the Larmor frequency (∼17 MHz); (bottom) 14N resonances with simulations (blue trace: A3(N1,3,5) = 7.7 MHz, 3P3 = 2.4 MHz; red trace: A3(N2,4,6) = 7.0 MHz, 3P3= 1.5 MHz). Conditions: Frequency, 34.849 GHz; Davies pulse sequence: tπ = 100 ns, τ = 600 ns, tRF = 15 μs, repetition time, 50 ms.