Abstract
ABSTRACTThe X-band PLDMR of C70 films and C70 molecules isolated in a toluene/polystyrene glass matrix (C70:T/PS) is described. The PLDMR of C70:T/PS strikingly differs from that observed in C60:T/PS due to much longer triplet lifetimes. The PLDMR of C70 films indicates that the delocalized triplet is distorted by intermolecular interactions and shows a half-field resonance due to triplet-triplet fusion. In addition, a broader powder pattern and a narrow enhancing line at g=2.0029 are observed. The former is attributed to a localized triplet exciton of size similar to a 5- or 6-membered ring. The latter is believed to result from enhanced polaron recombination. The PLDMR of oxidized and photopolymerized films quenches the localized triplet and reveals the possibility of an even more delocalized exciton.
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