Figure 8.

First derivative X-band anisotropic EPR spectra of (a) complex 1 dissolved in DMSO; (b) complex 1 dissolved in DMSO after 24 h; and (c) complex 1 dissolved in the phosphate buffer (pH 7.4) after 24 h. Fac and mer isomers are denoted with 1a and 1b, while with the dotted lines the M_I = −7/2, −5/2, −3/2, 1/2, 3/2, 5/2, 7/2 resonances of the species 1b are shown. The presence of a minor amount of the undissolved solid causes the isotropic resonance centered around 3400 Gauss and indicated by the asterisk. The approximate vanadium concentration to record the spectra was 8 × 10^–4 M.