Extended Data Fig. 1: Spectral changes associated with the formation of 2, 2a and 2b.
From: Trapping of a phenoxyl radical at a non-haem high-spin iron(II) centre

a, UV/Vis spectral changes associated with the formation of 2 (bold line) starting from 1 (dashed line) by addition of excess O2, NaBPh4 (1.3 eq) and HClO4 (0.5 eq) in CH3CN at 0°C. Inset: Time traces for the formation of 2 with different amounts of ferrocene (Fc) showing a sigmoidal feature with an increase of the induction time with increasing amount of Fc. b, Comparison of the UV/vis spectra of 2 (black), 2a (dotted) and 2b (dashed) Inset: time traces of the decay of the characteristic ~660 nm band associated with 2, 2a and 2b at 10 °C.