Figure 3.

First derivative ESR spectra after one-electron addition (single electron transfer) to (A) 2d (2.0 mg/mL, blue) and to (B) 2e (2.0 mg/mL, black) at 77 K in homogeneous glassy (7.5 M LiCl/D₂O, pD ca. 5) solution. Electrons were generated by γ-irradiation (absorbed dose = 600 Gy at 77 K) of the glassy solution. The ESR spectrum (red) (reproduced from ref 53, Copyright [2015] American Chemical Society) shown in panel (A) is that of $\text{1-MeCyt-N}{\sigma }^{·}$ (Scheme 3) formed by one-electron oxidation of 1-MeCyt by ${\text{Cl}}_2^{\dot{-}}$ (see ref 53 for details). The three reference markers (indicated by triangles at the bottom of the figure) in this figure are Fremy’s salt resonances. The central marker is at g = 2.0056, and the markers are separated from one another by 13.09 G.^18,27,47,53