Abstract
The energy relaxation dynamics of the photoexcited [2+2]-bridged C60 dimer in o-dichlorobenzene has been investigated by the time-resolved fluorescence and transient absorption techniques. The absorption and fluorescence spectra of the C60 dimer show that the monomeric moieties of C60 are only weakly interacting with each other, indicating that the C60 dimer can be considered as a nearly decoupled bichromophoric molecular system in the ground state. The lowest emitting state of the C60 dimer is formed with ∼60-ps time constant, while its fluorescence decays nearly as fast (∼1.22 ns) as in the C60 monomer (∼1.17 ns). The 60-ps decay component was suggested to be due to a transition from an optically nonemissive state to an emissive state in the C60 dimer. It was also found that the overall photophysical properties of the C60 dimer have much more to do with the disruption of the π-bond system than any bichromophoric interaction between the individual C60 units.
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