Magnetic properties of TDAE-C70-toluene

The magnetic properties of single crystal TDAE-C70-toluene are reported in relation to its unique dimerized structure of C70 molecules in the unit cell. The g-factor at room temperature (g=2.0052) suggests that the origin of the magnetism is different from C70 (g=2.002). The spins on the C70 molecules are cancelled out due to the dimerization. No magnetic phase transition appears at least down to 0.5 K. The magnetic susceptibility follows the Curie–Weiss law with the Weiss constant of +0.36 K. These results show that the weakly coupled spins on TDAE molecules contribute the magnetism of this salt, which is in contrast to the ferromagnetic TDAE-C60 where the TDAE spins are cancelled.