1. Singlet oxygen generation by C[sub 60] and C[sub 70]—an ESR study.
- Author
-
Sienkiewicz, A., Garaj, S., Białkowska-Jaworska, E., and Forro´, L.
- Subjects
ORGANIC solvents ,FULLERENES ,CARBON - Abstract
Under illumination in organic solvents, pristine fullerenes, C[sub 60] and C[sub 70], reveal a high triplet state yield that is close to unity and are known to effectively generate electronically excited singlet oxygen (¹Δ[sub g]). We applied the ESR technique to monitor ¹Δ[sub g] generation efficiency for both fullerenes in toluene solutions that were exposed to the white light. Total signal intensity of TEMPO, a stable nitroxide resulting from ¹Δ[sub g] attack on ESR-silent precursor, TMP (2,2,4,4-Tetramethylpiperidine), was measured to follow the singlet oxygen generation. We also performed a similar experiment using a solid sample of paraffin. The relative efficiency of ¹Δ[sub g] generation in the presence of both C[sub 60] and C[sub 70] in solutions and in a solid sample was estimated from the increase rates of TEMPO formation. [ABSTRACT FROM AUTHOR]
- Published
- 2000