In view of the lack of information on the structure of M@C60 (M: alkaline earth and lanthanide metal) because of its instability and difficulties in purifying it, we have carried out and report here some structural investigations of Dy@C60. We obtained a pure sample of Dy@C60 by high-performance liquid chromatography with aniline as an eluent, and studied it by Dy LIII-edge x-ray-absorption fine structure and Raman scattering. Our results show conclusively that the structure is endohedral (with the metal inside the C60 cage) and that electron transfer takes place between Dy and C60. The Dy in Dy@C60 is located at an off-center position 1.25-1.30 Å from the center of the C60 cage. The valence of the Dy is shown to be +3 on the basis of a Dy LIII-edge x-ray absorption near edge structure study. The Ag(2) Raman peak also shows that three electrons have been transferred from the Dy atom to the C60 cage. The UV-VIS-IR spectrum suggests that the highest-occupied-lowest-unoccupied-molecular-orbital gap is small.
|Number of pages||3|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Sep 15 2001|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics