Observation of radioactive fullerene families labeled with {sup 11}C
- Tohoku Univ., Sendai (Japan)
- Tokyo Metropolitan Univ. (Japan)
Here, we demonstrate the observation of radioactive fullerenes labeled with {sup 11}C which were produced by photonuclear reaction, namely, {sup 12}C/({gamma},n){sup 11}C ({sup 11}C nuclide decays to {sup 11}B with a half-life of 20.4 min and emits a 511 KeV annihilation {gamma}-ray for {beta}{sup +} decay). These observations are of great interest because they indicate that the carbon network of a fullerene can survive the recoil energy when {sup 11}C is produced by nuclear reaction. This gives us a simple means for producing radioactive fullerene molecules, opening up not only new questions in basic science but also new applications, such as radioactive tracers for nuclear medicine and other fields. In conclusion, experimental evidence seems to show that radioactive C{sub 60} and C{sub 70} fullerenes and products, such as fullerene dimers labeled with {sup 11}C, have been isolated and detected in a liquid phase by radiochromatography. These species were produced by a photonuclear reaction. The {sup 11}C nuclide exists in fullerenes to the extent of about 60-70% of the total amount of {sup 11}C produced when the C{sup 60} sample was irradiated, but at about 20% of the total {sup 11}C when C{sub 70} was irradiated. This successful production of fullerenes labeled with {sup 11}C demonstrates the structural stability and/or flexibility of fullerene cages. 13 refs., 3 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 199413
- Journal Information:
- Journal of the American Chemical Society, Vol. 117, Issue 51; Other Information: PBD: 27 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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