Fourier transform infrared and Raman spectroscopic study of chromatographically isolated LiΓ60 and LiΓ70

Andrei Gromov, Denis Ostrovskii, Andreas Lassesson, Martin Jönsson, Eleanor E.B. Campbell

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31 Scopus citations

Abstract

IR and Raman investigations have been carried out on purified LiΓ60 and LiΓ70 produced by low-energy ion implantation. The structural interpretations, based on theoretical considerations and comparison of the obtained vibrational spectra with those of different known fullerene oligomers, have shown that neither of the chromatographically isolated endohedral species (LiΓ60(70)) correspond to monomeric nonderivatized molecules. We ascribe the two different fractions of LiΓ60 to a double-bonded dimer and a trimer, presumably with the shape of closed triangle. The infrared and Raman spectra of the LiΓ70 compound are similar to those of (C70)2, and we therefore propose for this species the structure of a double-bonded dimer (LiΓ70)2. The IR spectra of the LiΓ60 fractions prepared with 6Li and 7Li isotopes are identical except for the position of broad bands at about 450-600 cm-1, originating from vibrational-rotational movement of the Li+ cation inside the carbon cage.

Original languageEnglish
Pages (from-to)11290-11301
Number of pages12
JournalJournal of Physical Chemistry B
Volume107
Issue number41
DOIs
StatePublished - 16 Oct 2003

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