Fullerenes

Abstract

A review of the structure and properties of fullerenes is presented. Emphasis is given to their behavior as molecular solids. The structure and property modifications produced by alkali-metal doping are summarized, including modification to the electronic structure, lattice modes, transport, and optical properties. Particular emphasis is given to the alkali-metal-doped fullerenes because of their importance as superconductors. A review of the structure and properties of fullerene-based graphene tubules is also given, including a model for their one-dimensional electronic band structure. Potential applications for fullerene-based materials are suggested.

Optical spectra of C 60 and C 70 complexes: their similarities and differences

“…The absorption of light for parallel polarisation is signi®cantly lower than that for perpendicular polarisation up to about 600 nm for C 70 (S 8 ) 2 and 580 nm for C 70 (S 8 ) 6 ; above these wavelengths, opposite eects are observed. In particular, the absorption for parallel polarisation increases with wavelength and even shows a broad maximum at about 840 nm for the C 70 (S 8 ) 6 complex. 19 The observed spectral anisotropy is consistent with the crystal structure of the investigated complexes.…”

“…There is another structure with only slightly higher energy in which an electron-rich double bond on one C 60 molecule is placed in front of an electron-poor hexagonal face. 6 The moderate electron anity of the C 60 fullerene 7,8 enables its reaction with electron-rich organic molecules. Usually, the charge transfer from a donor to the fullerene is very small and the C 60 complexes are neutral in their ground state.…”

“…The outstanding quality of single crystals of C 70 complexes with crown sulphur donor, of two dierent compositions (S 8 ) 2 and (S 8 ) 6 , enabled Semkin et al 19 to measure for the ®rst time the anisotropy of the electronic absorption spectra. A strong absorption centred at 290 nm and typical of neutral C 70 crystals has its counterpart in the spectra of all the investigated complexes.…”

“…Counterparts of the band at 420 nm for neutral C 70 show distinct shifts and rather strong anisotropies for the two C 70 complexes with crown sulphur donor (Fig 13). The bands for light polarisation perpendicular ( c ) to the long crystal axes for C 70 (S 8 ) 2 and C 70 (S 8 ) 6 are shifted to about 410 and 400 nm respectively. For parallel polarisation (k) these bands disappear for both complexes.…”

Instability and thermal conductivity of pressure-densified and elastically altered orientational glass of Buckminsterfullerene

“…Readers interested in details may consult the brief reviews given in Refs. 12,13,14,15,16,17,18,19,20,21, a comprehensive review on the high pressure studies by Sundqvist 10 and also two recent studies devoted to the structure of the C60-crystal and the P-and H-orientations in it. 22,23 Since disorder in liquids and ODICs cannot be quantified, the knowledge of Rp makes C60-OG unique among disordered solids.…”