Figure 5
(a) Arrhenius plot of the rotational diffusion coefficient, D, of C60 in (3)2C60 obtained from the CSA relaxation data listed in Table 2. The activation energy is Ea = 6.25 kJ mol−1, while the pre-exponential factor was D0 = 3.36 × 1011 s−1. (b) EPR spectrum of the `off-the-shelf' C60 (upper panel; material exploited in the synthesis of the complex) and EPR spectrum of complex (3)2C60 (lower panel). |