Magnetic ordering at 20 K and below in the C60 and C70 based fullerene salts Original Research Article

A number of different C60 and C70 fullerene monoderivatives were synthesized and doped with tetrakis(dimethylamino)ethylene (TDAE) and cobaltocene (Cp2Co) to create charge transfer complexes with the aim of finding novel magnetic materials based on fullerenes. In this work X-band electron spin resonance (ESR) measurements are presented together with characterization of these charge transfer complexes using infrared and ultraviolet (UV)/Vis/near infrared spectroscopy. In most of these materials interactions between electronic spins on fullerene derivatives is found to be antiferromagnetic including C70 except for 3-aminophenyl-methane[60]fullerene doped with cobaltocene which shows ferromagnetic behaviour below 20 K.