Anionic and upper-excited fluorescence of C60 encapsulated in Y zeolitic nanocavity

Abstract

C60 inserted into a Y zeolitic nanocavity shows anomalous upper-excited fluorescence as well as anionic and normal fluorescence. The intercalation of C60 into the supercage of the zeolite has been confirmed by measuring 129XE NMR spectra while the formation of ？C60- has been identified by measuring its ESR spectrum. Time-resolved fluorescence spectra show that the upper-excited fluorescence has the maximum intensity at 450 nm and decays in 28 ps to give birth to the normal fluorescence with the maximum at 750 nm. The normal one decays on the time scale of 1700 ps, while the anionic fluorescence with the maximum intensity at 770 nm has a shorter lifetime of 170 ps.