Fluorescence of the C 60–pyridine system in electrochemistry reduction processes

Abstract

Three groups of strong fluorescence peaks of C 60, centered at 440, 575 and 700 nm, are observed in the supersaturated C 60–pyridine solution, and the onsite fluorescence spectra of this C 60–pyridine system in the first and second electrochemistry reduction processes are obtained for the first time. The results indicate that the fluorescence peaks centered at 440 nm originate from C 60 molecules dissolved in supersaturated C 60–pyridine solution, while fluorescence bands centered at 575 and 700 nm are emitted from undissolved C 60. It is also proved that a strong charge transfer interaction, which is significant for the symmetry increase of C 60 n - , as well as the formation of a transmission channel of energy, occurs between C 60 n - and pyridine, as is supported by surface-enhanced Raman scattering (SERS) spectra as well.