Figure 3.
(A) ESR spectra of authentic 1-Me-dG(N2-H)• obtained from glassy (7.5 M LiCl) in D2O (blue) and in H2O (green) samples of 1-Me-dGuo by one-electron oxidation via annealing at 155 K in the dark. Expansion of the wings by factor of 5 shows the Azz component of N2-H coupling in H2O – which is lost in D2O. (B) Comparison of the spectrum of 1-Me-dG(N2-H)• obtained from glassy (7.5 M LiCl) in H2O (green) samples of 1-Me-dGuo with the simulated spectrum (black). In Table 1, the ESR parameters, hyperfine couplings and g-values, used for the simulated spectrum (black) are provided. Our results clearly show that in 1-Me-dG(N2-H)• in H2O, the additional line components due to the HFCC value of N2-H atom are clearly observable at the wings of the spectrum. All the ESR spectra were recorded at 77 K.