Figure 6.

First derivative X-band anisotropic EPR spectra of (a) [V^IV(L¹)₂] (1); (b) [V^IV(L²)₂] (2); (c) [V^IV(L³)₂] (3); and (d) [V^IV(L⁴)₂] (4). All the spectra were recorded in CH₂Cl₂ at 120 K with an approximate vanadium concentration of 8 × 10^–4 M. With the dotted lines, the M_I = −7/2, 7/2 resonances of the species 1a–4a and 1b–2b are indicated, while with the asterisk, the isotropic absorption due to the undissolved solid complex 3 is shown. The low- and high-field regions of the spectrum of 1 are amplified by 20 and 25 times, respectively, at the top of the figure.