FT-RAMAN SPECTROSCOPIC STUDIES OF C-60 AND C-70 SUBSEQUENT TO CHROMATOGRAPHIC-SEPARATION INCLUDING SOLVENT EFFECTS

Citation
K. Lynch et al., FT-RAMAN SPECTROSCOPIC STUDIES OF C-60 AND C-70 SUBSEQUENT TO CHROMATOGRAPHIC-SEPARATION INCLUDING SOLVENT EFFECTS, Journal of physical chemistry, 99(20), 1995, pp. 7985-7992
Citations number
41
Categorie Soggetti
Chemistry Physical
ISSN journal
00223654
Volume
99
Issue
20
Year of publication
1995
Pages
7985 - 7992
Database
ISI
SICI code
0022-3654(1995)99:20<7985:FSSOCA>2.0.ZU;2-1
Abstract
C-60/C-70 containing soot was produced by are-vaporization of graphite . The chromatographic separation of soot yielded fairly pure C-60 and C-70 samples. High-resolution FT-Raman spectra of C-60 and C-70 specim en as well as C-60 and C-70 solutions including polarization measureme nts are recorded. Compared to the spectrum of solid C-60, some Raman b ands of the C-60 solution change their position and shape. Even the pu rest commercial C-60 samples contain solvent inclusions (impurities) i n the order of some percentage. The chromatographic separation combine d with Raman polarization measurements of solutions allows an evaluati on of the fundamental vibrations of the C-60 molecule. Its assignment, in accordance with the group theoretical expectation, is proposed. Th e existence of small amounts of C-60 isomers (symmetry, e.g., C-2v, D- 2h, D-2d) in icosahedral C-60 (I-h) is affirmed based on the polarizat ion measurements. For C-70 the most extended set of Raman frequencies is presented.