Figure 2.
Top plot: EPR (v = 9.4373 GHz) spectrum of 0.1 mM tetraester nitroxide 5 in 25 mM phosphate buffer (pH = 7.4). Simulation: g = 2.0058, A(14N) = 38.70 MHz (n = 1), A(1H) = 1.30 MHz (n = 4), A(1H) = 1.05 MHz (n = 2), A(1H) = 1.087 MHz (n = 2), LW (Lorentzian) = 0.020 mT. Bottom plot: EPR (v = 9.4393 GHz) spectrum of 0.1 mM tetracarboxylic acid nitroxide 8 in 25 mM phosphate buffer (pH = 7.6). Simulation: g = 2.00563, A(14N) = 42.08 MHz (n = 1), A(1H) = 2.26 MHz (n = 2), A(1H) = 1.65 MHz (n = 2), A(1H) = 1.26 MHz (n = 2), LW (Lorentzian) = 0.028 mT.