EPR and Overhauser Shift on [PΦ4+]C60- and KxC60
Radical anion salts of C60 exhibit striking electronic and magnetic properties ranging from superconductivity to ferromagnetism. In this contribution we report on EPR and 1H and 13C-Overhauser shift measurements in the stable 13 C-radical anion salt [Pφ4]+C60- and 1H-Overhauser shift measurements in KxC60 (x<3). We performed Overhauser shift measurements to determine the spin density distribution of the unpaired electrons using 13C and 1H nuclei as local probes for the electronic wavefunction. In [Pφ4]+C60− the 1H-Overhauser shift indicates spin density on the Pφ4+-counterion. In KXC60 three distinct 1H- Overhauser shift signals are observed. Two signals are attributed to solvent molecules included during the extraction of C60 from the soot, and one signal is attributed to protons attached to C60.
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