Triplet-EPR spectroscopy on the Diels-Alder adduct of C 60 and 4,5-dimethoxy- o-quinodimethane in frozen solution

Abstract

Pulsed-EPR spectroscopy was used to study a modified C 60 molecule (1) in its photoexcited triplet state. The analysis of the triplet EPR lineshape shows a break of the high symmetry of the lowest populated triplet state of C 60 due to the modification of the C 60 unity. The reported temperature dependence of the spectra is influenced by relaxation effects. Lineshape simulations based on a triplet Hamiltonian including anisotropic T 1/ T 2 relaxation were performed. The results are discussed in relation to the behaviour of pure 3C 60.