Abstract
The Raman spectra of the neutral state complex C60*C10H12Se4 *2 (CS2) [C10H12Se4, tetramethyl-tetra-selenafulvalene (TMTSF) ] were measured as a function of pressure at room temperature. The pressure dependence of almost all intramolecular phonon modes exhibits irreversible changes at 5. 4 ± 0. 5 GPa, the more characteristic of them being the irreversible softening by 9 cm-1 of the Ag (2) pentagon-pinch (PP) mode, observed upon total pressure release. This softening is analogous to that observed in the case of KC60. These observations may be attributed to an irreversible phase transition involving the transfer of one electron from TMTSF donor to C60 acceptor molecule.
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