Temperature and solvent effects on the luminescence spectrum of C{sub 70}: Assignment of the lowest singlet and triplet states

Journal Article · Wed Nov 29 04:00:00 EST 1995 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00152a018· OSTI ID:171482

Argentine, S M; Kotz, K T; Francis, A H ^[1]

---

1. Univ. of Michigan, Ann Arbor, MI (United States)

The temperature, solvent, and concentration dependence of the fluorescence and phosphorescence spectra of C{sub 70} in glassy solutions have been examined. Spectra have been recorded over the temperature range 4-200 K. In addition, the AC Stark field modulated phosphorescence and the phosphorescence of {sup 13}C{sub 70} have been recorded and analyzed. The lowest triplet state is identified as a {sup 3}E{sub 1}` state and the vibronic structure consists primarily of Herzberg-Teller active e{sub 2}` modes. The intensity of the electronic origin is comparable to the vibronically induced intensity and is extraordinarily solvent sensitive. The solvent sensitivity exhibited by the spectra is shown to have the same origins as that observed in benzene and pyrene, but is several times greater in magnitude. Analysis of the spectra suggests that two electronic excited states contribute to the observed phosphorescence spectrum. 27 refs., 6 figs., 1 tab.

• Sponsoring Organization: USDOE
• OSTI ID: 171482
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 47 Vol. 117; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
66 PHYSICS
ABUNDANCE
EMISSION SPECTRA
ENERGY LEVELS
EXCITED STATES
FULLERENES
LUMINESCENCE
PHOSPHORESCENCE
SOLVENTS
TEMPERATURE DEPENDENCE