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| - Anisotropic Pseudorotation of the Photoexcited Triplet State of Fullerene C60 in MolecularGlasses Studied by Pulse EPR
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| - Spin-polarized echo-detected electron paramagnetic resonance (EPR) spectra and the transversal relaxationrate T2-1 of the photoexcited triplet state of fullerene C60 molecules were studied in o-terphenyl,1-methylnaphthalene, and decalin glassy matrices. The model is composed of a fast (correlation time ∼10-12s) pseudorotation of 3C60 in a local anisotropic potential created by interaction of the fullerene molecule withthe surrounding matrix molecules. In simulations, this potential is assumed to be axially symmetric aroundsome axis of a preferable orientation in a matrix cage. The fitted value of the potential was found to dependon the type of glass and to decrease monotonically with a temperature increase. A sharp increase of the T2-1temperature dependence was found near 240 K in glassy o-terphenyl and near 100 K in glassy1-methylnaphthalene and decalin. This increase probably is related to the influence on the pseudorotation ofthe onset of large-amplitude vibrational molecular motions (dynamical transition in glass) that are known forglasses from neutron scattering and molecular dynamics studies. The obtained results suggest that molecularand spin dynamics of the triplet fullerene are extremely sensitive to molecular motions in glassy materials.
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