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Isotropic EPR spectra of 0.5 mM solutions of (a) [Gd(L1)], (b) [Gd(L2)]+ and (c) [Gd(L3)]+ at pH 6.8 (0.1 M aqueous HEPES buffer) obtained after addition of 4 molar equivalents of sodium ascorbate. Microwave Freq. 9.43 GHz, power. 7 mW; Mod. Amp. 0.4 mT, Freq. 100 KHz. T=293 K.
