Abstract
New ionic DA-type charge transfer solids of C 70 − were prepared with bis(benzene)chromium (Bz 2Cr) and decamethylmetallocenes ( Cp 2 ∗ M ) (M=Ni, Cr). In the solid-state EPR spectra, no signals confirming C 70 − spins were detected below room temperature (RT), probably due to either an electronic or chemical dimerization. Above RT, a signal characteristic of a strong exchange coupling between donor cation and C 70 − spins gradually emerged for Bz 2Cr complex, owing to the decoupling of the dimers. In dimethyl sulfoxide at RT, a signal characteristic of C 70 − spins was observed at g=2.0012–2.0014 with a narrow linewidth.
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