A spectroscopic study of M@C82 metallofullerenes: Raman, far-infrared, and neutron scattering results |
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Authors: | S. Lebedkin B. Renker R. Heid H. Schober H. Rietschel |
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Affiliation: | (1) Forschungszentrum Karlsruhe, INFP, D-76021 Karlsruhe, Germany (Fax: +49-7247/824624, E-mail: lebedkin@infp.fzk.de), DE;(2) Max-Planck-Institut für Physik komplexer Systeme, D-01187 Dresden, Germany, DE;(3) Institut Laue–Langevin, F-38042 Grenoble, France, FR |
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Abstract: | 82 metallofullerenes have been studied at room temperature by Raman (for M=La, Y, Ce, Gd), far-infrared (FIR) (for M=La, Y, Ce), and inelastic neutron scattering (INS) (for M=La, Y) spectroscopy. Raman and FIR spectra suggest that these metallofullerenes have a common dominant, if not a single, structure of the C82 cage and a similar bonding of the encapsulated metal ion, i.e. the bonding is primarily electrostatic and the metal atoms are in the same oxidation state (+3). The metal ion vibrations are located around 160 and 50 cm-1. INS reveals no gap between internal vibrational and external vibrational and rotational modes in the range ∼50–200 cm-1 as is typically observed for other fullerides and also predicted by our model calculations. Presumably this is due to strong intermolecular interactions between M@C82 units in the bulk sample. The studied metallofullerenes are air sensitive, and degradation in air could be followed by changes in the Raman spectra. Received: 24 August 1997/Accepted: 26 September 1997 |
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Keywords: | PACS: 78.30 61.12 |
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