C Isotope Enriched Azafullerene, C 59 N, for Nuclear Spin Labelling
نویسندگان
چکیده
Synthesis of highly 13 C isotope enriched azafullerene, C 59 N embedded in C 60 is reported. 13 C enriched fullerenes, produced with the Krätschmer-Huffmann process, were subject to a N 2 discharge that produces C 59 N with a low probability. Raman spectroscopy indicates a homogeneous 13 C distribution. Electron spin resonance measurement (ESR) proves that the C 59 N concentration, 0.2 %, is similar as in non-enriched fullerenes. The ESR spectrum is simulated accurately with the known 14 N and 13 C hyperfine coupling constants. The material enables the nuclear spin-labelling of heterofullerene complexes with a potential for biological applications. It might also find applications as a building element for quantum computation.
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